2024 GMC Sierra 2500HD: Electrical System complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 33 owner complaints for the 2024 GMC Sierra 2500HD that list the electrical system component. Complaints are individual owner reports, not verified defects.
Examples:
- NHTSA complaint ODI #11766690 (filed 09/24/2026): “The vehicle experienced a loss of engine power accompanied by a check engine warning light and a “reduced acceleration”/reduced-power condition. the exact component causing the malfunction has not yet been determined. the vehicle and any affected components are available for inspection upon request.…”
- NHTSA complaint ODI #11764802 (filed 09/16/2026): “Driving down the road going to and intersection the dash says i received a service esc message followed by a reduced acceleration warning on the center display. i also had the forward collision, traction control and check engine lights come on. i also noticed the shudder/jerk. the truck is giving a…”
- NHTSA complaint ODI #11737376 (filed 05/12/2026): “Intermittent trailer disconnect and loss of electric trailer brake output while towing airstream. the truck is connected to the trailer through the seven way plug. there are no modifications to the truck. this is a safety hazard as i pull a 9000+ lb trailer. trailer connection drops momentarily an…”
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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