I have a 2015 Silverado 1500 LT 5.3 V8
1. CEL is on - p057c, b124c, and u0401
2. Service trailer brake warning message comes up every time I start the truck so the trailer brakes don't work
3. Cruise control doesn't work
4. Remote start doesn't work
My goal is to get cruise control, remote start, and trailer brakes to work
I've replaced the brake pedal position sensor, positive battery terminal, and trailer brake switch on the dash (also cleared the codes each time I've replaced something). I have a trailer brake power control module assembly coming in the mail that I'm going to replace whenever I get it.
Does anyone have any experience with these problems and what I might could do to fix them?
What makes this problem better or worse?
Nothing
How long has your 2015 Chevrolet Silverado 1500 had this problem?
RepairPal Certified shops can diagnose and repair your 2015 Chevrolet Silverado 1500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
You've got a real electrical gremlin on your hands, but let's break it down.
The P057C points to a brake pedal position sensor issue, which you already replaced—good move.
The B124C is a trailer brake control module fault, so your incoming module might help.
The U0401 means the ECM is getting bad data from another module, which also could be the yet to be installed trailer brake power control module assembly.
Before throwing more parts at it, check all grounds, especially near the battery and under the dash. A weak ground can cause all sorts of weirdness. Also, scan for live data on the brake pedal sensor—if it's out of range, the truck might think you're always on the brakes, disabling cruise and remote start.
If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.
