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Service bulletins for the 2024 GMC Hummer EV Pickup

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

568 on file from NHTSA, as of 2026-10-19.

About C1114 on the 2024 GMC Hummer EV Pickup: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: C1114 are shown. Show all

Bulletins, newest first
PIT6212C2025-05-19. Service bulletin. UNKNOWN OR OTHER. This Preliminary information communicates an issue with the Hydrastar Electric Over Hydraulic trailer brake system causing a voltage spike into the trucks electrical system which is causing DTC C1114 to set.
23-NA-1492024-12-04. Service bulletin. SERVICE BRAKES; ELECTRICAL SYSTEM. This technical bulletin provides a procedure to correct the condition of Trailer Brake Disabled and/or DTC C1114 Stored During Pulling a Trailer with a Battery, Generator or Solar Charger.
PIT6212B2024-10-25. Service bulletin. SERVICE BRAKES. This Preliminary information communicates an issue with the Hydrastar Electric Over Hydraulic trailer brake system causing a voltage spike into the trucks electrical system which is causing DTC C1114 to set.
23-NA-1492024-06-24. Service bulletin. SERVICE BRAKES; ELECTRICAL SYSTEM. This technical bulletin provides a procedure to correct the condition of Trailer Brake Disabled and/or DTC C1114 Stored During Pulling a Trailer with a Battery, Generator or Solar Charger.
23-NA-1492024-02-23. Service bulletin. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL; SERVICE BRAKES, HYDRAULIC; EQUIPMENT; ELECTRICAL SYSTEM. This technical bulletin provides a procedure to correct the condition of Trailer Brake Disabled and/or DTC C1114 Stored During Pulling a Trailer with a Battery, Generator or Solar Charger.
23-NA-1492023-10-10. Service bulletin. EQUIPMENT; SERVICE BRAKES. This technical bulletin provides a procedure to correct the condition of Trailer Brake Disabled and/or DTC C1114 Stored During Pulling a Trailer with a Battery, Generator or Solar Charger.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.