Left Front Wheel Speed Circuit Malfunction (GM)
The C0035 code means the vehicle's onboard diagnostic system has detected: Left Front Wheel Speed Circuit Malfunction (GM). This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $100 - $600 (wheel-speed sensor or wiring most often; EBCM/pump work costs more)
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Common Symptoms
- ABS and/or traction control warning lights on
- ABS and stability assist may be disabled (base brakes still work)
- Possible false ABS activation at low speed with a failing wheel-speed sensor
Probable Causes (Ranked by Likelihood)
- Fault in the ABS/traction control component this code names (Left Front Wheel Speed Circuit Malfunction) High
- Damaged wiring or a corroded connector in that circuit - road-splash zones corrode connectors High
- Failed related sensor or actuator Moderate
- Control module fault Low
Common Fixes by Vehicle
What techs usually find when diagnosing C0035 on specific vehicles — tap your vehicle for the fix and the exact part:
2007-2018 Chevrolet Silverado/GMC Sierra easy DIY
Left front wheel speed sensor failure is extremely common on GM trucks. The sensor sits in a harsh environment and corrodes at the connector. Unplug the sensor connector at the frame and check for green corrosion. If corroded, replace the sensor and apply dielectric grease to the new connector. The tone ring on the CV axle can also crack, causing erratic readings -- inspect it while the sensor is out.
Labor: 30-45 min2007-2017 Chevrolet Tahoe/Suburban/Yukon easy DIY
Same sensor as the trucks but the wiring harness routing is slightly different. On Tahoe/Yukon, the harness clips along the frame often break, letting the wire hang and chafe against the frame. Inspect the full length of the wire from sensor to frame connector. A chafed wire will cause intermittent ABS and traction control lights. Repair the wire and secure with new loom clips.
Labor: 30 min - 1 hour2008-2017 Chevrolet Equinox/GMC Terrain moderate DIY
The wheel speed sensor on the Equinox/Terrain is integrated into the wheel hub assembly. When the sensor fails, you replace the entire hub. Listen for a humming noise that changes with speed -- if present, the hub bearing is also failing. Hub replacement is straightforward with basic tools. Torque the axle nut to 177 ft-lbs after installation.
Labor: 1-2 hoursFrequently Asked Questions
What does C0035 mean?
C0035 is a chassis code used primarily by GM vehicles: Left Front Wheel Speed Circuit Malfunction. It concerns the ABS/traction control system.
Can I keep driving with C0035?
Base brakes keep working, but assume ABS and stability control are offline until repaired - allow longer stopping distances and drive gently, especially in rain or snow. Repair promptly.
Is C0035 the same on every make?
The decimal C0xxx range is dominated by GM's assignments (Chevrolet, GMC, Buick, Cadillac). Other makes may use this ID differently - if your vehicle is not a GM product, verify the meaning in your make's service information.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
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Read the code with a GM-capable scan tool and note the symptom byte/subcode if shown.
-
View live data for the named circuit (e.g. all four wheel speeds while rolling for wheel-speed codes).
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Inspect the circuit's wiring and connectors - chassis harnesses live in the splash zone and corrode first.
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Follow the GM pinpoint test for C0035 before replacing components.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
C0035 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Commonly Affected Vehicles
- Chevrolet, GMC, Buick, Cadillac (GM chassis code range)
Related Codes
See All Codes & Fixes for Your Vehicle
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