C0043 DTC: Right Front Wheel Speed Sensor Circuit High
What Does C0043 Mean?
Diagnostic Trouble Code (DTC) C0043 indicates that the ABS control module has detected a voltage or signal level above the expected operating range in the right front wheel speed sensor circuit. This condition is commonly caused by an open circuit, excessive circuit resistance, poor electrical connections, damaged wiring, or a faulty wheel speed sensor.
Symptoms
- ABS warning light illuminated
- Traction Control (TCS) warning light ON
- Electronic Stability Control (ESC) warning
- ABS disabled during emergency braking
- Traction Control unavailable
- Cruise control may be disabled on some vehicles
- Additional ABS-related DTCs stored
Common Causes
- Faulty right front wheel speed sensor
- Open circuit in the sensor wiring
- Loose or disconnected electrical connector
- Corroded connector terminals
- Damaged wiring harness
- Damaged tone ring (reluctor ring)
- Faulty ABS control module (rare)
Typical Diagnostic Flow
How to Diagnose C0043
- Read ABS DTCs using a professional scan tool.
- Monitor live wheel speed data while driving.
- Compare the right front wheel speed with the other three wheels.
- Inspect the sensor wiring for open circuits or damaged insulation.
- Check the connector for loose, bent, or corroded terminals.
- Inspect the tone ring for cracks, rust, or missing teeth.
- Measure sensor resistance and circuit voltage according to manufacturer specifications.
Typical Values
- All wheel speed sensors should display nearly identical wheel speeds during normal driving.
- A consistently high circuit voltage usually indicates an open circuit or poor electrical connection.
- Actual specifications vary by vehicle manufacturer.
Estimated Repair Cost
- Wheel speed sensor replacement: $70–250
- Wiring repair: $50–200
- Connector replacement: $30–120
- Tone ring replacement: $80–300
- Wheel bearing replacement: $150–500
- ABS module replacement: $400–1,200
Related DTCs
- C0041
- C0042
- C0044
- C0045
- C0050
Frequently Asked Questions
Can I drive with C0043?
Yes. Normal braking remains available, but the ABS, Traction Control, and Stability Control systems may be disabled until the fault is repaired.
What is the most common cause of C0043?
The most common causes are an open circuit, damaged wiring, loose connectors, corroded terminals, or a faulty right front wheel speed sensor.
Will clearing the DTC permanently fix C0043?
No. Clearing the code only removes it temporarily. If the high-voltage condition remains, the ABS module will detect the fault again during the next self-test.