C1114 on GMC
Manufacturer-Specific Chassis Control Code
C1114 on GMC vehicles indicates manufacturer-specific chassis control code. Au7o has documented this code across 1 GMC model — most commonly on Sierra 3500HD. C1114 is a manufacturer-specific chassis trouble code, and its meaning differs between makers (for example, some applications associate it with a trailer brake control or other chassis control circuit). Broadly, it indicates that a chassis control module detected a fault in a circuit or component it monitors. Because there is no single generic definition, do not assume a specific component without confirmation. Use a capable scan tool with manufacturer data or the factory service manual to determine what C1114 means on your exact vehicle. Typical repair costs on GMC range from $80 to $900, depending on the specific model and root cause.
Common Causes of C1114
- •Wiring or connector fault in the affected circuit
- •Faulty control solenoid or actuator
- •Open or short circuit (to ground or power)
- •Low or unstable supply voltage / poor ground
- •Internal control module fault
- •Corrosion or moisture at connectors
C1114 on GMC by Model
GMC Sierra 3500HD(1 issue)
- Trailer brake controller / integrated trailer brake module malfunction2015-2023
Sierra 3500HD owners towing heavy loads report intermittent trailer brake output loss, warning messages, or erratic gain behavior from the integrated trailer brake controller. NHTSA complaints and GM service bulletins/diagnostics commonly point to module/software issues, poor connector pin fit/corrosion at the 7-way, or wiring faults that cause the system to disable trailer brakes unexpectedly.
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View C1114 across all makes →Frequently Asked Questions
What does C1114 mean on GMC?▼
C1114 stands for "Manufacturer-Specific Chassis Control Code." C1114 is a manufacturer-specific chassis trouble code, and its meaning differs between makers (for example, some applications associate it with a trailer brake control or other chassis control circuit). Broadly, it indicates that a chassis control module detected a fault in a circuit or component it monitors. Because there is no single generic definition, do not assume a specific component without confirmation. Use a capable scan tool with manufacturer data or the factory service manual to determine what C1114 means on your exact vehicle. On GMC specifically, this code is documented across 1 model.
What causes C1114 on GMC vehicles?▼
Common causes on GMC: Wiring or connector fault in the affected circuit, Faulty control solenoid or actuator, Open or short circuit (to ground or power), Low or unstable supply voltage / poor ground, Internal control module fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1114 on a GMC?▼
Repair costs on GMC range from $80 to $900, depending on the specific model and root cause.
Which GMC models have C1114 documented?▼
Au7o has documented C1114 on 1 GMC model: Sierra 3500HD.