Limp Mode Fail Strikes Again!

[RadioDoc]

Well, this has now happened to me three times in a row, and quite honestly I wish Ford would give us something solid to go off of, especially for those of us who don't have the luxury of dropping off the truck for an extended period of time at a Ford dealer.

So, the symptoms - start driving, and the truck suddenly throws a barrage of errors - ESC fails, gear selection at low speed message, hill assist disable, pre-collision assist disabled, ABS light is on, MIL is on, service wrench is on, and drive mode selection is disabled. Might be something else in there that's disabled, but you get the gist. Truck loses all response to gas pedal, slows down and then slams on the parking brake at like 1-2 mph. Taking the parking brake off, you have no gas pedal input and the truck just accelerates up to 30-35 mph (don't know the exact number, because every time this has happened to be the speed limit was 30 or less so I ended up just riding the brakes to keep the speed down).

The only benefit here, and why I'm also making this post, is to share that there is a bit of a workaround so you're not completely stranded in a garbage situation. And we'll get to that here in a minute.

At least with the fail this time I had my laptop with me, so fired up FORScan and managed to get a complete system read of all the failures in real time. So here's the fail right after it happened (luckily I was in a parking lot, so was able to pull immediately over into some open spots):

First capture at 20240405 1518z

===SOBDMC DTC U1011:86-AF===
Code: U1011 - Invalid Internal Control Module Monitoring Data Received from ECM/PCM

Additional Fault Symptom (:86):
- Signal Invalid

Status (-AF):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Secondary OBD Control Module C

Freeze Frame  #1:
-EVENT_TIME: 42662823 s (Fri Apr 05 16:15:17 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 15.0 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 66 °F - Outside temperature
-ENG_TQ: 0.4 ft·lb - Engine Torque
-PRNDL_T: N  - Shift Position
-TFT: 70 °F - Transmission Fluid Temperature
-M_SPEED: 752 1/min - Motor Speed
-GTQ_CMD: 0.0 ft·lb - Generator Torque Command
-MTQ_CMD: 0.0 ft·lb - Motor Torque Command
-M_INV_V: 222.90 V - Motor Inverter Voltage
-G_PHTMP: 70 °F - Generator Inverter Phase Temperature
-MCLTEMP: 79 °F - Motor Coil Temperature
-GCLTEMP: 81 °F - Generator Coil Temperature
-G_SPEED: -749 1/min - Generator Speed
-TQ_DSD: 0.0 ft·lb - Desired Total Torque
-M_PHTMP: 86 °F - Motor Inverter Phase Temperature
-VEHMODE: Driving  - Vehicle Control Mode
-ECU_ONTIME: 64 min - Module On Time since Key On or Reset
-ECT: 115 °F - Engine coolant temperature
-CTO: 0 1/min - Tachometer signal output
-HV_AMP: 1.60 A - High Voltage Battery Current
-HVBAT_V: 222.50 V - High Voltage Battery Voltage
-APP: 9.00 % - Accelerator Pedal Position
-VPWR: 14.64 V - Control Module Voltage
-VS: 6.1 mph - Vehicle Speed
===END SOBDMC DTC U1011:86-AF===

===SOBDMC DTC U1028:00-26===
Code: U1028 - ABS Control Module Received Invalid Data from ECM/PCM 'A'

Status (-26):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Secondary OBD Control Module C

===END SOBDMC DTC U1028:00-26===

===BECM DTC None===
Successful DTC reading, no error codes found

Module: Battery Energy Control Module

===END BECM DTC None===

===PCM DTC U1010:00-AF===
Code: U1010 - Invalid Internal Control Module Monitoring Data Received from Hybrid Powertrain Control Module

Status (-AF):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Powertrain Control Module

Freeze Frame  #1:

Freeze Frame  #2:
-EVENT_TIME: 42662822 s (Fri Apr 05 16:15:16 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-FUELSYS: error  - Fuel System Status (Open/Closed Loop)
-LOAD: 0.00 % - Calculated Load Value
-ECT: 115 °F - Engine coolant temperature
-SHRTFT1: 0.00 % - Short term fuel trim 1
-LONGFT1: -3.91 % - Long term fuel trim 1
-MAP: 14.5 psi - Manifold absolute pressure sensor
-RPM: 0 1/min - Engine Revolutions Per Minute
-VSS: 6.2 mph - Vehicle Speed
-SPARKADV: 0.00 ° - Spark Advance
-IAT: 68 °F - Intake Air Temperature
-RUNTM: 104 s - Time Since Engine Start
-EVAP_PCT: 0.00 % - Commanded Evaporative Purge
-BARO: 14.5 psi - Barometric pressure
-VPWR: 14.89 V - Control Module Voltage
-TP_REL: 7.84 % - Relative Throttle Position
-TAC_PCT: 9.41 % - Commanded Throttle Actuator Control
-EVAP_VP: 1.7 psi - Evaporative System Vapor Pressure
===END PCM DTC U1010:00-AF===

===OBDII DTC U1011-P===
Code: U1011 - Invalid Internal Control Module Monitoring Data Received from ECM/PCM

Status (-50):
- Pending - malfunction is expected to be confirmed

Module: On Board Diagnostic II

===END OBDII DTC U1011-P===

===PACM DTC None===
Successful DTC reading, no error codes found

Module: Pedestrian Alert Control Module

===END PACM DTC None===

===DCDC DTC None===
Successful DTC reading, no error codes found

Module: DC to DC Converter Control Module

===END DCDC DTC None===

===BdyCM DTC B1444:15-08===
Code: B1444 - Left Rear Stop/Position Lamp Output

Additional Fault Symptom (:15):
- Circuit Short To Battery Or Open

Status (-08):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Body Control Module

===END BdyCM DTC B1444:15-08===

===BdyCM DTC B1448:15-08===
Code: B1448 - Right Rear Stop/Position Lamp Output

Additional Fault Symptom (:15):
- Circuit Short To Battery Or Open

Status (-08):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Body Control Module

===END BdyCM DTC B1448:15-08===

===BECMB DTC None===
Successful DTC reading, no error codes found

Module: Battery Energy Control Module B

===END BECMB DTC None===

===BCM_C DTC None===
Successful DTC reading, no error codes found

Module: Body Control Module C

===END BCM_C DTC None===

===TRM DTC None===
Successful DTC reading, no error codes found

Module: Trailer Module

===END TRM DTC None===

===OCS DTC None===
Successful DTC reading, no error codes found

Module: Occupant Classification System Module

===END OCS DTC None===

===ABS DTC U0401:00-2F===
Code: U0401 - Invalid Data Received from ECM/PCM A

Status (-2F):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Antilock braking system

Freeze Frame  #1:
-EVENT_TIME: 42662822 s (Fri Apr 05 16:15:16 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 14.8 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 64 °F - Outside temperature
===END ABS DTC U0401:00-2F===

===ABS DTC U0131:00-2E===
Code: U0131 - Lost Communication With Power Steering Control Module 'A'

Status (-2E):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Antilock braking system

Freeze Frame  #1:
-EVENT_TIME: 42662822 s (Fri Apr 05 16:15:16 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 14.8 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 64 °F - Outside temperature
===END ABS DTC U0131:00-2E===

===TCU DTC None===
Successful DTC reading, no error codes found

Module: Telematic Control Unit Module

===END TCU DTC None===

===RCM DTC None===
Successful DTC reading, no error codes found

Module: Restraint Control Module

===END RCM DTC None===

===HVAC DTC None===
Successful DTC reading, no error codes found

Module: Heating Ventilation Air Conditioning

===END HVAC DTC None===

===GSM DTC None===
Successful DTC reading, no error codes found

Module: Gear Shift Module

===END GSM DTC None===

===PSCM DTC None===
Successful DTC reading, no error codes found

Module: Power Steering Control Module

===END PSCM DTC None===

===ACM DTC U0255:00-28===
Code: U0255 - Lost Communication With Front Display Interface Module

Status (-28):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Audio Control Module

Freeze Frame  #1:
-EVENT_TIME: 42567147 s (Thu Apr 04 13:40:41 2024) - Event time
-TOTAL_DISTANCE: 15883 miles - Total Distance
-ELEC_POE_STAS: Not Received  - Electric Power Status
-ING_STAS: Run  - Ignition Status
-POW_TOR_STAS: Powerpack Start In Progress Torque NA  - Powerpack Torque Status
===END ACM DTC U0255:00-28===

===SCCM DTC None===
Successful DTC reading, no error codes found

Module: Steering Column Control Module

===END SCCM DTC None===

===IPC DTC None===
Successful DTC reading, no error codes found

Module: Instrument Panel Control Module

===END IPC DTC None===

===GWM DTC None===
Successful DTC reading, no error codes found

Module: Gateway Module A

===END GWM DTC None===

===IPMA DTC U0418:86-AF===
Code: U0418 - Invalid Data Received from Brake System Control Module 'A'

Additional Fault Symptom (:86):
- Signal Invalid

Status (-AF):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Image Processing Module A

Freeze Frame  #1:
-EVENT_TIME: 42662822 s (Fri Apr 05 16:15:17 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 14.8 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 64 °F - Outside temperature
-VEHICLE_SPEED: 6 mph - Vehicle Speed
-ECU_POWER_SUPPLY: 14.7 V - ECU Power Supply Voltage
-ECU_INTERNAL_TEMPERATURE: 93 °F - ECU Internal Temperature
===END IPMA DTC U0418:86-AF===

Well, that sucks, especially with 15 miles of 60 mph country road ahead of me. But, still have a couple of errands to run, so let's just reset the codes and see if it comes back. And what do you know, still in limp mode, complete with all of the systems disabled messages. Second read from 20240405 1521z:

===SOBDMC DTC U1011:86-AF===
Code: U1011 - Invalid Internal Control Module Monitoring Data Received from ECM/PCM

Additional Fault Symptom (:86):
- Signal Invalid

Status (-AF):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Secondary OBD Control Module C

Freeze Frame  #1:
-EVENT_TIME: 42663153 s (Fri Apr 05 16:20:47 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 15.0 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 68 °F - Outside temperature
-ENG_TQ: 0.0 ft·lb - Engine Torque
-PRNDL_T: P  - Shift Position
-TFT: 70 °F - Transmission Fluid Temperature
-M_SPEED: 0 1/min - Motor Speed
-GTQ_CMD: 0.0 ft·lb - Generator Torque Command
-MTQ_CMD: 0.0 ft·lb - Motor Torque Command
-M_INV_V: 221.90 V - Motor Inverter Voltage
-G_PHTMP: 73 °F - Generator Inverter Phase Temperature
-MCLTEMP: 77 °F - Motor Coil Temperature
-GCLTEMP: 79 °F - Generator Coil Temperature
-G_SPEED: 0 1/min - Generator Speed
-TQ_DSD: 0.0 ft·lb - Desired Total Torque
-M_PHTMP: 77 °F - Motor Inverter Phase Temperature
-VEHMODE: Driving  - Vehicle Control Mode
-ECU_ONTIME: 64 min - Module On Time since Key On or Reset
-ECT: 108 °F - Engine coolant temperature
-CTO: 0 1/min - Tachometer signal output
-HV_AMP: 1.20 A - High Voltage Battery Current
-HVBAT_V: 221.50 V - High Voltage Battery Voltage
-APP: 0.00 % - Accelerator Pedal Position
-VPWR: 14.72 V - Control Module Voltage
-VS: 0.0 mph - Vehicle Speed
===END SOBDMC DTC U1011:86-AF===

===SOBDMC DTC U1028:00-AE===
Code: U1028 - ABS Control Module Received Invalid Data from ECM/PCM 'A'

Status (-AE):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Secondary OBD Control Module C

Freeze Frame  #1:
-EVENT_TIME: 42663164 s (Fri Apr 05 16:20:58 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 13.0 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 68 °F - Outside temperature
-ENG_TQ: 0.0 ft·lb - Engine Torque
-PRNDL_T: P  - Shift Position
-TFT: 70 °F - Transmission Fluid Temperature
-M_SPEED: 0 1/min - Motor Speed
-GTQ_CMD: 0.0 ft·lb - Generator Torque Command
-MTQ_CMD: 0.0 ft·lb - Motor Torque Command
-M_INV_V: 48.70 V - Motor Inverter Voltage
-G_PHTMP: 73 °F - Generator Inverter Phase Temperature
-MCLTEMP: 77 °F - Motor Coil Temperature
-GCLTEMP: 79 °F - Generator Coil Temperature
-G_SPEED: 0 1/min - Generator Speed
-TQ_DSD: 0.0 ft·lb - Desired Total Torque
-M_PHTMP: 77 °F - Motor Inverter Phase Temperature
-VEHMODE: Powerup  - Vehicle Control Mode
-ECU_ONTIME: 64 min - Module On Time since Key On or Reset
-ECT: 108 °F - Engine coolant temperature
-CTO: -32768 1/min - Tachometer signal output
-HV_AMP: 0.00 A - High Voltage Battery Current
-HVBAT_V: 222.00 V - High Voltage Battery Voltage
-VPWR: 12.64 V - Control Module Voltage
-VS: -203.6 mph - Vehicle Speed
===END SOBDMC DTC U1028:00-AE===

===BECM DTC None===
Successful DTC reading, no error codes found

Module: Battery Energy Control Module

===END BECM DTC None===

===PCM DTC None===
Successful DTC reading, no error codes found

Module: Powertrain Control Module

===END PCM DTC None===

===OBDII DTC None===
Successful DTC reading, no error codes found

Module: On Board Diagnostic II

===END OBDII DTC None===

===PACM DTC None===
Successful DTC reading, no error codes found

Module: Pedestrian Alert Control Module

===END PACM DTC None===

===DCDC DTC None===
Successful DTC reading, no error codes found

Module: DC to DC Converter Control Module

===END DCDC DTC None===

===BdyCM DTC None===
Successful DTC reading, no error codes found

Module: Body Control Module

===END BdyCM DTC None===

===BECMB DTC None===
Successful DTC reading, no error codes found

Module: Battery Energy Control Module B

===END BECMB DTC None===

===BCM_C DTC None===
Successful DTC reading, no error codes found

Module: Body Control Module C

===END BCM_C DTC None===

===TRM DTC None===
Successful DTC reading, no error codes found

Module: Trailer Module

===END TRM DTC None===

===OCS DTC None===
Successful DTC reading, no error codes found

Module: Occupant Classification System Module

===END OCS DTC None===

===ABS DTC U0401:00-2F===
Code: U0401 - Invalid Data Received from ECM/PCM A

Status (-2F):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Antilock braking system

Freeze Frame  #1:
-EVENT_TIME: 42663156 s (Fri Apr 05 16:20:50 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 14.8 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 66 °F - Outside temperature
===END ABS DTC U0401:00-2F===

===TCU DTC None===
Successful DTC reading, no error codes found

Module: Telematic Control Unit Module

===END TCU DTC None===

===RCM DTC None===
Successful DTC reading, no error codes found

Module: Restraint Control Module

===END RCM DTC None===

===HVAC DTC None===
Successful DTC reading, no error codes found

Module: Heating Ventilation Air Conditioning

===END HVAC DTC None===

===GSM DTC None===
Successful DTC reading, no error codes found

Module: Gear Shift Module

===END GSM DTC None===

===PSCM DTC None===
Successful DTC reading, no error codes found

Module: Power Steering Control Module

===END PSCM DTC None===

===ACM DTC None===
Successful DTC reading, no error codes found

Module: Audio Control Module

===END ACM DTC None===

===SCCM DTC None===
Successful DTC reading, no error codes found

Module: Steering Column Control Module

===END SCCM DTC None===

===IPC DTC None===
Successful DTC reading, no error codes found

Module: Instrument Panel Control Module

===END IPC DTC None===

===GWM DTC None===
Successful DTC reading, no error codes found

Module: Gateway Module A

===END GWM DTC None===

===IPMA DTC U0418:86-6C===
Code: U0418 - Invalid Data Received from Brake System Control Module 'A'

Additional Fault Symptom (:86):
- Signal Invalid

Status (-6C):
- DTC Maturing - Intermittent at Time of Request
- Malfunction Indicator Lamp is Off for this DTC
- Test not complete

Module: Image Processing Module A

Freeze Frame  #1:
-EVENT_TIME: 42663156 s (Fri Apr 05 16:20:51 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 14.8 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 66 °F - Outside temperature
-ECU_POWER_SUPPLY: 14.7 V - ECU Power Supply Voltage
-ECU_INTERNAL_TEMPERATURE: 100 °F - ECU Internal Temperature
===END IPMA DTC U0418:86-6C===

This drive is going to suck, but I don't have the luxury of just sitting and waiting or going straight to a dealer. Gotta get the groceries. Drive a quarter mile over to the commissary, park up and get my shopping out of the way. Come back out to the truck, and this time when it powers on I'm not greeted with the limp mode barrage, just the MIL. Third pull at 20240405 1540z:

===SOBDMC DTC U1011:86-ED===
Code: U1011 - Invalid Internal Control Module Monitoring Data Received from ECM/PCM

Additional Fault Symptom (:86):
- Signal Invalid

Status (-ED):
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC
- Test not complete

Module: Secondary OBD Control Module C

Freeze Frame  #1:
-EVENT_TIME: 42663221 s (Fri Apr 05 16:21:56 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 15.0 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 68 °F - Outside temperature
-ENG_TQ: 0.0 ft·lb - Engine Torque
-PRNDL_T: P  - Shift Position
-TFT: 70 °F - Transmission Fluid Temperature
-M_SPEED: 0 1/min - Motor Speed
-GTQ_CMD: 0.0 ft·lb - Generator Torque Command
-MTQ_CMD: 0.0 ft·lb - Motor Torque Command
-M_INV_V: 221.60 V - Motor Inverter Voltage
-G_PHTMP: 72 °F - Generator Inverter Phase Temperature
-MCLTEMP: 77 °F - Motor Coil Temperature
-GCLTEMP: 77 °F - Generator Coil Temperature
-G_SPEED: 0 1/min - Generator Speed
-TQ_DSD: 0.0 ft·lb - Desired Total Torque
-M_PHTMP: 75 °F - Motor Inverter Phase Temperature
-VEHMODE: Driving  - Vehicle Control Mode
-ECU_ONTIME: 64 min - Module On Time since Key On or Reset
-ECT: 106 °F - Engine coolant temperature
-CTO: 0 1/min - Tachometer signal output
-HV_AMP: 1.26 A - High Voltage Battery Current
-HVBAT_V: 221.50 V - High Voltage Battery Voltage
-APP: 0.00 % - Accelerator Pedal Position
-VPWR: 14.72 V - Control Module Voltage
-VS: 0.0 mph - Vehicle Speed
===END SOBDMC DTC U1011:86-ED===

===SOBDMC DTC U1028:00-AC===
Code: U1028 - ABS Control Module Received Invalid Data from ECM/PCM 'A'

Status (-AC):
- DTC Maturing - Intermittent at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Secondary OBD Control Module C

Freeze Frame  #1:
-EVENT_TIME: 42663228 s (Fri Apr 05 16:22:03 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 12.8 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 68 °F - Outside temperature
-ENG_TQ: 0.0 ft·lb - Engine Torque
-PRNDL_T: P  - Shift Position
-TFT: 70 °F - Transmission Fluid Temperature
-M_SPEED: 0 1/min - Motor Speed
-GTQ_CMD: 0.0 ft·lb - Generator Torque Command
-MTQ_CMD: 0.0 ft·lb - Motor Torque Command
-M_INV_V: 53.40 V - Motor Inverter Voltage
-G_PHTMP: 72 °F - Generator Inverter Phase Temperature
-MCLTEMP: 77 °F - Motor Coil Temperature
-GCLTEMP: 77 °F - Generator Coil Temperature
-G_SPEED: 0 1/min - Generator Speed
-TQ_DSD: 0.0 ft·lb - Desired Total Torque
-M_PHTMP: 75 °F - Motor Inverter Phase Temperature
-VEHMODE: Open - Power Sustain Relay  - Vehicle Control Mode
-ECU_ONTIME: 64 min - Module On Time since Key On or Reset
-ECT: 106 °F - Engine coolant temperature
-CTO: 0 1/min - Tachometer signal output
-HV_AMP: 0.00 A - High Voltage Battery Current
-HVBAT_V: 221.50 V - High Voltage Battery Voltage
-APP: 0.00 % - Accelerator Pedal Position
-VPWR: 12.64 V - Control Module Voltage
-VS: 0.0 mph - Vehicle Speed
===END SOBDMC DTC U1028:00-AC===

===BECM DTC None===
Successful DTC reading, no error codes found

Module: Battery Energy Control Module

===END BECM DTC None===

===PCM DTC None===
Successful DTC reading, no error codes found

Module: Powertrain Control Module

===END PCM DTC None===

===OBDII DTC None===
Successful DTC reading, no error codes found

Module: On Board Diagnostic II

===END OBDII DTC None===

===PACM DTC None===
Successful DTC reading, no error codes found

Module: Pedestrian Alert Control Module

===END PACM DTC None===

===DCDC DTC None===
Successful DTC reading, no error codes found

Module: DC to DC Converter Control Module

===END DCDC DTC None===

===BdyCM DTC None===
Successful DTC reading, no error codes found

Module: Body Control Module

===END BdyCM DTC None===

===BECMB DTC None===
Successful DTC reading, no error codes found

Module: Battery Energy Control Module B

===END BECMB DTC None===

===BCM_C DTC None===
Successful DTC reading, no error codes found

Module: Body Control Module C

===END BCM_C DTC None===

===TRM DTC None===
Successful DTC reading, no error codes found

Module: Trailer Module

===END TRM DTC None===

===OCS DTC None===
Successful DTC reading, no error codes found

Module: Occupant Classification System Module

===END OCS DTC None===

===ABS DTC U0401:00-28===
Code: U0401 - Invalid Data Received from ECM/PCM A

Status (-28):
- Previously Set DTC - Not Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Antilock braking system

Freeze Frame  #1:
-EVENT_TIME: 42663222 s (Fri Apr 05 16:21:57 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 14.8 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 66 °F - Outside temperature
===END ABS DTC U0401:00-28===

===TCU DTC None===
Successful DTC reading, no error codes found

Module: Telematic Control Unit Module

===END TCU DTC None===

===RCM DTC None===
Successful DTC reading, no error codes found

Module: Restraint Control Module

===END RCM DTC None===

===HVAC DTC None===
Successful DTC reading, no error codes found

Module: Heating Ventilation Air Conditioning

===END HVAC DTC None===

===GSM DTC None===
Successful DTC reading, no error codes found

Module: Gear Shift Module

===END GSM DTC None===

===PSCM DTC None===
Successful DTC reading, no error codes found

Module: Power Steering Control Module

===END PSCM DTC None===

===ACM DTC None===
Successful DTC reading, no error codes found

Module: Audio Control Module

===END ACM DTC None===

===SCCM DTC None===
Successful DTC reading, no error codes found

Module: Steering Column Control Module

===END SCCM DTC None===

===IPC DTC None===
Successful DTC reading, no error codes found

Module: Instrument Panel Control Module

===END IPC DTC None===

===GWM DTC None===
Successful DTC reading, no error codes found

Module: Gateway Module A

===END GWM DTC None===

===IPMA DTC U0418:86-2C===
Code: U0418 - Invalid Data Received from Brake System Control Module 'A'

Additional Fault Symptom (:86):
- Signal Invalid

Status (-2C):
- DTC Maturing - Intermittent at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Image Processing Module A

Freeze Frame  #1:
-EVENT_TIME: 42663223 s (Fri Apr 05 16:21:57 2024) - Event time
-TOTAL_DISTANCE: 15946 miles - Total Distance
-MODULE_VOLTAGE: 14.8 V - Control Module Voltage
-OUTDOOR_TEMPERATURE: 66 °F - Outside temperature
-ECU_POWER_SUPPLY: 14.7 V - ECU Power Supply Voltage
-ECU_INTERNAL_TEMPERATURE: 100 °F - ECU Internal Temperature
===END IPMA DTC U0418:86-2C===

So what happened? Only thing that comes to mind is that the truck sat long enough that it all of the systems were able to be properly power cycled, since turning the truck off with the key doesn't actually turn the truck off right away. Reset the codes again, and this time nothing came back, code read was completely clean, MIL off, and everything was perfectly fine. Got home no issues, and then proceeded on a 150mi drive to the airport without any problems.

So what's the takeaway? If you get this fail, get somewhere safe, turn the truck off for 5-10 minutes, then proceed on your way. Obviously there's a problem, but at least you don't need to be stuck in limp mode the whole time.

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[CurtisB]

Appreciate your post.

 

[surfstar]

Anyone done a deep dive comparing as-builts from pre/post recall?

Is there coding we can "undo" or is it firmware?

 

[LAClippers420]

Thank you for this! You’re doing a whole lot more than Ford is!

 

[23grayXLT84]

I am shocked there isn't a recall for the recall or any type of acknowledgement from Ford regarding this issue.

Someone somewhere said they released a update last week but no further details and it was likely a dealer telling someone that just to tell them it was "fixed".

 

[insulanus]

My 2023 Hybrid XL (16,927 miles) was hit with the same error earlier today. Three weeks after having the BCM recall completed.

One week after the recall service I noticed a squeak when the vehicle switched from battery to ICE. A few hard stops were also noticed.

Dealer will look at it Wednesday. Troublesome, as this is my work vehicle.

 

[fechter]

My 2023 Hybrid XL (16,927 miles) was hit with the same error earlier today. Three weeks after having the BCM recall completed.

One week after the recall service I noticed a squeak when the vehicle switched from battery to ICE. A few hard stops were also noticed.

Dealer will look at it Wednesday. Troublesome, as this is my work vehicle.

The same thing happened to me yesterday! Had the recalls done 3 weeks ago.

I was just a few blocks from home so I pulled over and restarted after 5 minutes. Truck was fine except for the check engine light. The app had the the active alerts.

I figured I'd call the dealer after I got to work today. Started up and still had the check engine light. Got to work and had to put off calling the dealer.

When I went to get lunch the engine light was gone. Checked the app and it was clean, no alerts at all.

I'd piss on a spark plug if I thought it'd help Ford come up with a fix.

 

[MavChris]

This may be way off, but came to my mind after reading through the printouts of errors that FORScan produced. These trucks (and most other modern vehicles) have multiple computer systems that communicate to each other. Looks like a major breakdown in communication is happening between at least a couple of systems. Maybe a loose or faulty connector somewhere? I have also seen online where a truck (in this case a 2022 Doge Ram 1500) would run for approx 20 min and then go into limp mode and pretty much disable the truck. Wait a period of time and the truck would start up and run fine, for another 20 min then do the same thing. Through days of troubleshooting the mechanic discovered there was a faulty connector between the BCM and ECU. This particular connector had a tiny resister for each pin in the plug. After 20 minutes the resister on one of the pins in the plug from the BCM was overheating and malfunctioning. The faulty resister was causing "data" not to be transferred on that one wire. That's all it took to disable the entire vehicle after 20 minutes of driving. Have no idea if any of the connectors in the Maverick have resisters?? Just thinking outside the box. If anything it appears that the recall update for the BCM is affecting hybrids way more and possibly corrupting data that the different systems use to communicate.

 

[Random]

I am shocked there isn't a recall for the recall or any type of acknowledgement from Ford regarding this issue.

Someone somewhere said they released a update last week but no further details and it was likely a dealer telling someone that just to tell them it was "fixed".

I posted that I got an updated update. My truck sat at the dealer for four weeks too while they worked with big F to figure it out.

https://www.mavericktruckclub.com/f...-later-lane-centering-broke.44108/post-813356

 

[Maverick2023]

i still have those recall letters from Ford and they are going right into the trash. I'm not doing any recall until this is figured out.

 

[RAnSD619]

Well, this has now happened to me three times in a row, and quite honestly I wish Ford would give us something solid to go off of, especially for those of us who don't have the luxury of dropping off the truck for an extended period of time at a Ford dealer.

So what's the takeaway? If you get this fail, get somewhere safe, turn the truck off for 5-10 minutes, then proceed on your way. Obviously there's a problem, but at least you don't need to be stuck in limp mode the whole time.

Sorry this is happening to you but thanks for sharing your experiences and the advice on the 5-10 minute power cycle.

 

[RAnSD619]

I am taking my Mav in for a warranty claim on two weeks to fix my broken spare tire winch. I put in the service request and going to insist my Service Rep write NO RECALLS in the service notes. If they insist on the recalls I’m driving off to deal with the winch another day.

 

[Dad]

Wow . . . just wow! Thank you for turning a negative (and frightening) experience into useful information. You've probably done more then the entire Ford organization to document the problem. I would guess your FORScan readouts would be of some help to any Ford techs who have any interest in solving this problem. I see a big time lawsuit if someone gets injured due to this.

 

[RadioDoc]

This may be way off, but came to my mind after reading through the printouts of errors that FORScan produced. These trucks (and most other modern vehicles) have multiple computer systems that communicate to each other. Looks like a major breakdown in communication is happening between at least a couple of systems. Maybe a loose or faulty connector somewhere? I have also seen online where a truck (in this case a 2022 Doge Ram 1500) would run for approx 20 min and then go into limp mode and pretty much disable the truck. Wait a period of time and the truck would start up and run fine, for another 20 min then do the same thing. Through days of troubleshooting the mechanic discovered there was a faulty connector between the BCM and ECU. This particular connector had a tiny resister for each pin in the plug. After 20 minutes the resister on one of the pins in the plug from the BCM was overheating and malfunctioning. The faulty resister was causing "data" not to be transferred on that one wire. That's all it took to disable the entire vehicle after 20 minutes of driving. Have no idea if any of the connectors in the Maverick have resisters?? Just thinking outside the box. If anything it appears that the recall update for the BCM is affecting hybrids way more and possibly corrupting data that the different systems use to communicate.

I've thought about the faulty connection angle before, but the logic for it doesn't really work out. Of the 3 times I've gotten this fail, all three were effectively with a "cold" truck. First fail, got maybe a tenth of a mile outside of work (accelerating after a stop). Second fail, hadn't driven the truck at all that day, pops 100 yards away from the house. Third fail, drove a mile from work to the post office no issue, then it pops after I got back in the truck and started to drive out of the parking spot. Between (and after this last fail), multiple long distance drives over some rough roads, so anything physical should pop up more than it does. My daily commute is a 30 mile round trip over roads that have been beat up by the local farm traffic, so it's definitely not kind on the suspension. Figure with that kind of abuse if there was a wiring issue it'd make itself known pretty quick. This all makes me think that the problem is software based, the question just comes down to what's the combination of inputs happening that's causing the ECU/PCM to crash?

@Ford Motor Company if y'all have any insight or want to chime in on this, would love to hear from you guys. This mystery limp mode activation is starting to become a bit of a black eye for the hybrid Mavs, and I'm sure no one wants "plagued by software issues" attached to what's actually a pretty decent truck.

 

[RadioDoc]

Wow . . . just wow! Thank you for turning a negative (and frightening) experience into useful information. You've probably done more then the entire Ford organization to document the problem. I would guess your FORScan readouts would be of some help to any Ford techs who have any interest in solving this problem. I see a big time lawsuit if someone gets injured due to this.

Yea the way the limp mode kicks in concerns me greatly. With Ford being mute on this issue figured I might as well contribute something constructive to the conversation seeing as how I have a somewhat vested interest. I'm just lucky in that I've never had this happen in traffic or at any kind of speed, unlike some other members here. But because of this, my wife is scared to drive the truck in case it pops on her and she would rather tempt fate in her old Mini Cooper that needs to go into the shop every other month for some new mechanical defect.

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