C1402: RF Traction Control Solenoid Short to Ground
The C1402 code indicates a short-to-ground fault in the right front (RF) traction control solenoid valve circuit. This valve is part of the vehicle stability control (VSC) and traction control (TRAC) system, regulating hydraulic pressure to the brake caliper to prevent wheel spin. The control module detects abnormally low resistance or direct continuity to ground in the solenoid activation circuit, preventing proper valve operation and disabling traction control for that wheel. The solenoid typically operates via PWM signals, and the circuit includes the solenoid winding, connections to the ABS/VSC module, and ground paths. A short to ground can result from damaged wiring, corroded connectors, or internal solenoid failure, causing the module to set the code and illuminate the traction/stability warning light.
1. Commonly Affected Makes
2. Most Common Causes
- Right front traction control solenoid valve with internal winding shorted to ground
- Harness wiring between ABS/VSC module and valve with damaged insulation or chafing against chassis
- Valve connector with bent pins, corrosion, or water intrusion causing short to ground
- ABS/VSC module with damaged output driver internally shorted to ground
- Previous incorrect repair or modification to brake system wiring
3. Symptoms You Will Notice
- Traction control and/or stability control warning light illuminated
- Traction control system inoperative on right front wheel
- Possible ABS warning light activation
4. Step-by-Step Diagnosis
Scan for additional codes and verify C1402 is current
Visually inspect RF traction control solenoid connector and wiring for damage, corrosion, or chafing
Measure resistance between solenoid valve control circuit and ground; compare to specifications (typically several ohms, not zero)
Disconnect solenoid and check for short to ground in harness; if short disappears, solenoid is likely faulty
If harness is clear, test ABS/VSC module output driver for internal short (requires advanced diagnostics or module replacement)
5. Frequently Asked Questions
Is it safe to drive?▼
Driving is generally safe, but traction control will be disabled on the right front wheel, which may reduce stability in slippery conditions. Have the issue diagnosed and repaired soon.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the fix involves wiring repair ($150-$300) or solenoid/module replacement ($300-$600).