2020 Chevrolet Silverado 2500HD: Electrical System complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 17 owner complaints for the 2020 Chevrolet Silverado 2500HD that list the electrical system component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11764369 (filed 09/15/2026): “My vehicle was taken to legacy chevrolet of waxahachie where a routine recall notice was addressed. during the process they technician broke my battery terminal. upon my discovery the dealership claimed the broken terminal must have just broke on its own during the time it was at their dealership …”
- NHTSA complaint ODI #11755940 (filed 08/10/2026): “The contact owns a 2020 chevrolet silverado 2500. the contact stated that while driving at undisclosed speeds and towing a trailer, the message "trailer brake disconnected" was displayed with an audible chime. the vehicle was inspected by the dealer, but no fault was found with the vehicle. upon inv…”
- NHTSA complaint ODI #11746570 (filed 06/25/2026): “I got to my destination and got out of the truck and like a hour later i came back to my truck to get in and my truck was full of smoke and stunk and my center console and center dash melted and gone . nothing would work . that’s all i know…”
Likely causes
These complaints do not establish a single root cause; read the examples above and get a diagnosis.
Fix, in plain English
No single fix is established by these reports. Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer about technical service bulletins (TSBs) or extended warranty coverage, then have the system diagnosed.
DIY difficulty: Moderate
Finding and splicing chewed wiring is doable with a multimeter and patience but can be time-consuming; harness replacement is pro work. (Our assessment.)
Cost
No sourced cost range for this issue. Get a written quote after diagnosis.
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