C0055 on GMC
Rear Wheel Speed Sensor Circuit
C0055 on GMC vehicles indicates rear wheel speed sensor circuit. Au7o has documented this code across 1 GMC model — most commonly on Sierra 1500. This chassis code means the ABS/control module detected a problem with the rear wheel-speed sensor signal circuit. Wheel-speed sensors tell the module how fast each wheel is turning so it can manage anti-lock braking, traction, and stability control; on many GM trucks and SUVs this code points to a single rear/output speed sensor at the transmission or transfer case. A lost or erratic signal typically disables ABS and traction control (warning lights on), affecting braking safety, so it should be addressed promptly. Typical repair costs on GMC range from $300 to $900, depending on the specific model and root cause.
Common Causes of C0055
- •Faulty rear/vehicle speed sensor
- •Damaged, corroded, or open sensor wiring and connector
- •Debris or damage on the reluctor/tone ring
- •Excessive air gap or sensor mounting issue
- •Poor ground or shorted circuit
- •Faulty ABS/EBCM module (less common)
C0055 on GMC by Model
GMC Sierra 1500(1 issue)
- Front Hub Bearing Assembly Failure Causing ABS Activation, Noise, and Wheel Play1999-2013
Front wheel hub bearing assemblies on Sierra 1500 trucks commonly wear out, especially on 4WD models and trucks used with larger tires or in rough conditions. Owners report humming or growling that changes with speed, looseness in the front wheel, and in some cases ABS warnings or low-speed ABS activation because the wheel speed sensor is integrated into the hub. This is a frequent repair item across both GMT800 and GMT900 generations.
Looking for C0055 on a different make?
View C0055 across all makes →Frequently Asked Questions
What does C0055 mean on GMC?▼
C0055 stands for "Rear Wheel Speed Sensor Circuit." This chassis code means the ABS/control module detected a problem with the rear wheel-speed sensor signal circuit. Wheel-speed sensors tell the module how fast each wheel is turning so it can manage anti-lock braking, traction, and stability control; on many GM trucks and SUVs this code points to a single rear/output speed sensor at the transmission or transfer case. A lost or erratic signal typically disables ABS and traction control (warning lights on), affecting braking safety, so it should be addressed promptly. On GMC specifically, this code is documented across 1 model.
What causes C0055 on GMC vehicles?▼
Common causes on GMC: Faulty rear/vehicle speed sensor, Damaged, corroded, or open sensor wiring and connector, Debris or damage on the reluctor/tone ring, Excessive air gap or sensor mounting issue, Poor ground or shorted circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0055 on a GMC?▼
Repair costs on GMC range from $300 to $900, depending on the specific model and root cause.
Which GMC models have C0055 documented?▼
Au7o has documented C0055 on 1 GMC model: Sierra 1500.