2014 Chevrolet Silverado 2500HD: Electrical System complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 26 owner complaints for the 2014 Chevrolet Silverado 2500HD that list the electrical system component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11545297 (filed 09/18/2023): “Tcm failed. vehicle is at the dealership awaiting new part for over three months now. continue to get extended eta on the part, latest communication was maybe november before it ships. last vehicle dealership had took a year for the replacement tcm vehicle immediately went into ‘limp mode’ on highw…”
- NHTSA complaint ODI #11540440 (filed 08/23/2023): “Transmission control module failed on the highway while towing and left me and family in a dangerous situation.…”
- NHTSA complaint ODI #11282684 (filed 11/27/2019): “I have several dtc codes u029d u029e p0420 p220b on three occasions. these code are triggering a limited speed and possible power reduction. the dealer ship states that gmc protocol is to replace one sensor at a time and let the customer go so they can breakdown again. the part that is failing i a…”
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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