Audio Off Error - No Sound, No Volume Control

[MakinDoForNow]

can you elaborate on this? I just checked the battery with a multimeter and it was reading at 12.46v

think this could be a contributing factor by chance?

12.46 volts should not present a problem.

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[crbalch]

Update: Strangely, when I use the remote start feature and get into the truck, the audio is working. This only just started happening a few days ago after months of not working.

However, the audio ONLY works when I do the remote start, and even then it takes a little bit to actually kick in. If I try to start the truck using the push button, the audio remains off and never ends up turning on.

Does anyone have any idea what may be happening here? Clearly there is an issue somewhere, but it seems like it is more of a power/startup sequence issue more than anything right?

 

[crbalch]

@rugedraw is there any chance you can pull my codes again to see if you are able to derive anything based on the fact that it has been working on and off now?

 

[OleFordGuy]

Late seeing all this and didn't read it all so this may have already been done, my only thought is to disconnect the battery for a while and see if that does anything, i assume that would reset everything associated with the radio. Good Luck

 

[rugedraw]

@rugedraw is there any chance you can pull my codes again to see if you are able to derive anything based on the fact that it has been working on and off now?

You have these codes coming on and off. This was about 45 minutes ago. All active faults and not stored codes.

 

[HeyBales]

Update: Strangely, when I use the remote start feature and get into the truck, the audio is working. This only just started happening a few days ago after months of not working.

However, the audio ONLY works when I do the remote start, and even then it takes a little bit to actually kick in. If I try to start the truck using the push button, the audio remains off and never ends up turning on.

Does anyone have any idea what may be happening here? Clearly there is an issue somewhere, but it seems like it is more of a power/startup sequence issue more than anything right?

Interesting combo of errors and what does work.

I wonder if the communication via remote start is thru different route than communication from those modules not able to talk to the radio.

Could be 1 network connection between them to the radio, and 1 different route for remote.

How much do you enjoy reading thru wiring diagrams?

 

[crbalch]

Interesting combo of errors and what does work.

I wonder if the communication via remote start is thru different route than communication from those modules not able to talk to the radio.

Could be 1 network connection between them to the radio, and 1 different route for remote.

How much do you enjoy reading thru wiring diagrams?

not single clue how to go about doing that but I could probably learn or maybe use AI haha

 

[rugedraw]

not single clue how to go about doing that but I could probably learn or maybe use AI haha

Some things are very difficult to diagnose remotely. From my understanding, the raw audio signal comes from the APIM and goes to the ACM where is uses A2B to send the audio signals to the DSP (on vehicles with B&O that have a DSP). The codes your truck is reporting are lost comms codes between the APIM and several other modules, so on the surface, it seems like the source of the problem is the APIM itself.

 

[HeyBales]

Some things are very difficult to diagnose remotely. From my understanding, the raw audio signal comes from the APIM and goes to the ACM where is uses A2B to send the audio signals to the DSP (on vehicles with B&O that have a DSP). The codes your truck is reporting are lost comms codes between the APIM and several other modules, so on the surface, it seems like the source of the problem is the APIM itself.

Didn't the APIM, along with the DSP, IPC, WACM all have problems getting a response from the radio?
I'm guessing the radio in this case is the ACM, which is strange it doesn't call it that.
Or could that mean the radio specific section of the ACM didn't respond?

 

[Quest]

The radio is the ACM
All the codes are an HS3 communications problem with the ACM.
So its either a poor connection at the ACM or the ACM itself as all the modules down streem of the ACM never go offline

 

[rugedraw]

The radio is the ACM
All the codes are an HS3 communications problem with the ACM.
So its either a poor connection at the ACM or the ACM itself as all the modules down streem of the ACM never go offline

This makes sense to me. Just surprised to not see any ACM codes at all if it is the culprit.

@crbalch I see you're out of warranty. The ACM itself is not too difficult to get to and swap out yourself if you feel comfortable with basic tools. I am sure you can get one for cheap on ebay.

Edit: Or, you can just go in there to make sure the connectors to the ACM/APIM are seated properly. Once you remove the ACM, the bracket that holds the APIM is right above it.

 

[HeyBales]

This makes sense to me. Just surprised to not see any ACM codes at all if it is the culprit.

@crbalch I see you're out of warranty. The ACM itself is not too difficult to get to and swap out yourself if you feel comfortable with basic tools. I am sure you can get one for cheap on ebay.

Edit: Or, you can just go in there to make sure the connectors to the ACM/APIM are seated properly. Once you remove the ACM, the bracket that holds the APIM is right above it.

Once the ACM is online - it will have errors about not reaching the other modules.

I frequently get an ACM error that it didn't reach the IPC.
It's likely when I've turned the truck on and immediately into reverse.
Too much going on for the screen and chipset.

But it'll recover just fine.
But it still logs an error in itself.

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

Status:
- 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: 60361611 s (Wed Feb 4 19:51:32 2026) - Event time
-TOTAL_DISTANCE: 20281 miles - Total Distance
-ELEC_POE_STAS: Not Received - Electric Power Status
-ING_STAS: Run - Ignition Status
-POW_TOR_STAS: Powerpack On Torque Available - Powerpack Torque Status
-INT_AMB_TEM: 93 °F - Internal Ambient Temperature
-ECU_POWER_SUPPLY: 15.0 V - ECU Power Supply Voltage

===END ACM===

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