What Does C0235 Mean?
This code indicates the ABS control module has detected an open circuit in the rear wheel speed sensor signal circuit. The ABS module is not receiving a valid speed signal from one or both rear wheel speed sensors, which prevents the system from monitoring wheel rotation. This compromises the vehicle's anti-lock braking system, traction control, and stability control functions.
Common Causes
40%
Damaged or broken wheel speed sensor wiring harness, often caused by road debris, corrosion, or physical damage near the wheel well
30%
Failed rear wheel speed sensor with internal open circuit
20%
Corroded or damaged connector at wheel speed sensor or ABS module causing intermittent or complete loss of continuity
10%
Failed ABS control module unable to process wheel speed sensor signals
Diagnostic Steps
1
Step 1: Perform visual inspection of both rear wheel speed sensor wiring harnesses from sensor to ABS module, checking for damaged wires, broken insulation, corrosion at connectors, or loose connections
2
Step 2: Using a digital multimeter, measure resistance across the rear wheel speed sensor circuit at the sensor connector (sensor disconnected). Typical readings should be 800-1400 ohms for passive sensors or check manufacturer specification for active sensors
3
Step 3: Check circuit continuity from wheel speed sensor connector to ABS module connector with all components disconnected. Resistance should be less than 1 ohm per wire, and check for infinite resistance to ground indicating no short to ground
4
Step 4: If wiring is intact, swap left and right rear wheel speed sensors (if possible) and clear codes. If code follows the sensor, replace the faulty sensor. If code stays with the same circuit, inspect ABS module connections
5
Step 5: Verify proper air gap between sensor and tone ring (passive sensors typically 0.020-0.040 inches). Inspect tone ring for damage, missing teeth, or excessive debris buildup
6
Step 6: After repairs, clear codes, road test vehicle at speeds above 15 mph while monitoring live wheel speed data to confirm all four sensors are providing consistent signals
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
This code indicates the ABS control module has detected an open circuit in the rear wheel speed sensor signal circuit. The ABS module is not receiving a valid speed signal from one or both rear wheel speed sensors, which prevents the system from monitoring wheel rotation. This compromises the vehicl...
The most common cause of C0235 (Rear Wheel Speed Signal Circuit Open) is: Damaged or broken wheel speed sensor wiring harness, often caused by road debris, corrosion, or physical damage near the wheel well
Typical repair costs for C0235 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is drivable but ABS, traction control, and stability control will be disabled or function improperly. Stopping distances may increase on slippery surfaces and wheel lockup during hard braking is possible. Repair should be completed promptly, especially in wet or winter driving conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0235 to identify the root cause.
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Quick Info
Category
Chassis
System
Anti-lock Braking System (ABS) / Traction Control / Stability Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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