C1114 on GMC vehicles

A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.

Owners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.

Bulletins and campaigns GMC filed with NHTSA whose summary names C1114. Quote the document number at the service desk — it is a diagnosis the maker has already written down.

• PIT5509 Service bulletin
  2016-06-14 · Electrical System — Integrated Trailer Brake Control
• THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON HOW TO DIAGNOSE AND REPAIR VEHICLE THAT MAY HAVE A "CHECK TRAILER WIRING" OR "SERVICE TRAILER BRAKE SYSTEM” MESSAGE ON THE DRIVER INFORMATION CENTER WHEN A TRAILER IS CONNECTED TO THE VEHICLE. DIAGNOSTIC TROUBLE CODE C1114 SET IN THE CHASSIS CONTROL MODULE. CHASSIS CONTROL MODULE HAS TO DETERMINE THE TYPE OF TRAIL
• PIT5509A Service bulletin
  2017-01-26 · Electrical System — Integrated Trailer Brake Control
• This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System" message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trail
• PIT5509B Service bulletin
  2017-03-14 · Electrical System
• This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System” message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trail
• PIT5509C Service bulletin
  2017-06-06 · Electrical System — Software
• This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System” message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trail
• PIT5529A Service bulletin
  2017-12-21 · Electrical System — Integrated Trailer Brake Control
• This Preliminary Information communication provides information to the technician about vehicles that have Trailer connection not recognized or “Check Trailer wiring” or “Service Trailer Brake” message. Technician may find Diagnostic Trouble Codes C1112, C1113, C1114, C111B, U1556, and/or U1505. Technician will need to inspect the battery and Trailer Brake Power Module connector for corroded termi
• PIT5509D Service bulletin
  2018-05-22 · Electrical System
• This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System” message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trail
• PIT5509F Service bulletin
  2020-03-20 · Service Brakes, Electric
• This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System? message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trail
• 23-NA-149 Service bulletin
  2023-09-15 · 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.
• 23-NA-149 Service bulletin
  2024-02-15 · Electrical System — Integrated Trailer Brake Control
• 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-149 Service bulletin
  2024-06-07 · 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.
• PIT5521A Service bulletin
  2017-09-25 · Electrical System — 12V/24V/48V Battery
• This preliminary information communicates a Diagnostic Tip for a Service Trailer Brake Message with DTC C111B C1112 C1113 C1114 advising to address any battery issues first before any in depth diagnostics are done.
• PIT5509E Service bulletin
  2019-10-28 · Electrical System
• This Preliminary Information communication provides information to the technician on how to diagnose and repair vehicle that may have a "Check Trailer Wiring" or "Service Trailer Brake System? message on the Driver Information Center when a trailer is connected to the vehicle. Diagnostic Trouble Code C1114 set in the Chassis Control Module. Chassis Control Module has to determine the type of trail

A stored code names the test that failed, never the part that caused it. The record above is what GMC and its owners have filed about it; the code’s page across every make has the whole file.