- First Name
- Jim
- Joined
- Jan 13, 2022
- Threads
- 2
- Messages
- 19
- Reaction score
- 43
- Location
- Anderson, IN
- Vehicle(s)
- 2013 Ford Escape, 2018 Chevy Trax
- Engine
- 2.5L Hybrid
No problem!May I ask what the process was for the dealer identifying the 300A fuse? The reason I ask is that I've had an endless 12V battery drain and after 3 service visits and close to 20+ days in the shop....I can't get my dealer to look into the 300A fuse TSB because they "don't see a code for it yet". So all they've done is replace my original 12V battery - which didn't make a difference and the problem was back in 48 hours.
I've been living with a battery maintainer + a solar panel maintainer until I can figure out what to do next. I'm taking it this Saturday to a different Ford dealership in hopes they might be more helpful. Thanks for any advice you can provide - cheers!
I had the truck towed to the dealer. It was a Saturday, of course. Monday morning, they called and said the 12v battery had a dead cell, they replaced the battery, and it all tested fine. I picked it up and drove home, no problems. Went back out in the afternoon and the message that it was shutting off functions to preserve 12v was back within 1/4 mile. Drove straight to the dealership. They test drove it and got it to pop the messages. The tech found the TSB, and the electronics team at Ford walked him through how to test it. The fuse was indeed open. The rest is just ordering and replacing. So far, so good…..
Mine sounds suspiciously like yours. With that fuse open, it can’t recharge the 12v from the HV. The DCDC basically replaces the alternator. Push them a bit and bring up the TSB. There is a fairly specific code that it throws and a few other symptoms listed in the TSB. I pray they find it!
Note: I found it in another thread. It’s an SSM. Here it is:
| May 4 2023 New SSM 51598 2020-2023 Escape/Corsair, 2022-2023 Maverick – FHEV/PHEV - 12V Battery Voltage Low Or Discharged With DTC U3003:62 Stored In The DC/DC |
| Some 2020-2023 Escape/Corsair equipped with 2.5L engine full hybrid electric vehicle (FHEV) and plug-in hybrid electric vehicle (PHEV) powertrain and 2022-2023 Maverick vehicles equipped with 2.5L engine FHEV powertrain may exhibit a condition where the 12V battery voltage is low or discharged with diagnostic trouble code (DTC) U3003:62 stored in the direct current/direct current converter control module (DC/DC). The vehicle may also exhibit DTC U3003:16 and/or U3000:04 stored in the DC/DC module. This may be due to an open in the 300 amp mega fuse located in the high current battery junction box (BJB). To correct this condition, refer to Workshop Manual (WSM), Section 414-05>Pinpoint Test H1 to verify the 300amp mega fuse condition, replace the fuse upon confirmation it is open. Test and recharge the 12v battery. |
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