C0035 on GMC
Left Front Wheel Speed Sensor Circuit
C0035 on GMC vehicles indicates left front wheel speed sensor circuit. Au7o has documented this code across 2 GMC models — most commonly on Sierra 1500, Yukon XL. This chassis code indicates a fault in the left front wheel speed sensor circuit. Each wheel has a speed sensor that tells the ABS, traction control, and stability control systems how fast that wheel is turning; the control module sets this code when the signal from the left front sensor is missing, erratic, or out of range. Without a valid reading, the computer can't safely operate anti-lock braking and related systems, so it usually disables ABS and traction/stability control and lights the corresponding dashboard warnings (normal braking still works). It generally points to the sensor itself, its wiring, or the toothed reluctor ring it reads. Typical repair costs on GMC range from $150 to $1,500, depending on the specific model and root cause.
Common Causes of C0035
- •Faulty left front wheel speed sensor
- •Damaged sensor wiring or connector (road debris, corrosion)
- •Metal debris or rust on the sensor tip or air gap
- •Damaged or cracked tone/reluctor ring
- •Loose or improperly seated sensor
- •Corroded or loose wheel bearing with integrated sensor
- •Open or short in the sensor circuit
- •Faulty ABS control module (less common)
C0035 on GMC by Model
GMC Sierra 1500(2 issues)
- Electronic Brake Control Module Failure2014-2023
The electronic brake control module (EBCM) experiences failures causing ABS, traction control, and stability control systems to malfunction. Issues range from warning lights illuminating to complete system failures. The 2023 models have a specific recall for software that may fail to display a warning light when brake fluid loss occurs.
- 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.
GMC Yukon XL(1 issue)
- Front Hub Bearing and ABS Wheel Speed Sensor Corrosion Causing Unwanted ABS Activation2000-2006
GMT800 SUVs commonly develop corrosion under the front wheel speed sensors or wear in the hub bearing assembly, which alters the low-speed wheel speed signal. The result is unexpected ABS activation at parking-lot speeds, longer stopping distances, and a pulsating brake pedal even on dry pavement. GM documented this condition in service bulletins, and owners frequently report replacing hub assemblies to cure it.
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View C0035 across all makes →Frequently Asked Questions
What does C0035 mean on GMC?▼
C0035 stands for "Left Front Wheel Speed Sensor Circuit." This chassis code indicates a fault in the left front wheel speed sensor circuit. Each wheel has a speed sensor that tells the ABS, traction control, and stability control systems how fast that wheel is turning; the control module sets this code when the signal from the left front sensor is missing, erratic, or out of range. Without a valid reading, the computer can't safely operate anti-lock braking and related systems, so it usually disables ABS and traction/stability control and lights the corresponding dashboard warnings (normal braking still works). It generally points to the sensor itself, its wiring, or the toothed reluctor ring it reads. On GMC specifically, this code is documented across 2 models.
What causes C0035 on GMC vehicles?▼
Common causes on GMC: Faulty left front wheel speed sensor, Damaged sensor wiring or connector (road debris, corrosion), Metal debris or rust on the sensor tip or air gap, Damaged or cracked tone/reluctor ring, Loose or improperly seated sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0035 on a GMC?▼
Repair costs on GMC range from $150 to $1,500, depending on the specific model and root cause.
Which GMC models have C0035 documented?▼
Au7o has documented C0035 on 2 GMC models: Sierra 1500, Yukon XL.