C0040 — Right Front Wheel Speed Sensor Circuit
Category: Chassis Severity: High
Updated:
DTC code C0040 means: Right Front Wheel Speed Sensor Circuit. It falls under the "Chassis" category, with an estimated severity of High. Common causes include failed wheel speed sensor, broken sensor wire and damaged magnetic ring or tone wheel; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Failed wheel speed sensor
- Broken sensor wire
- Damaged magnetic ring or tone wheel
- Loose wheel bearing
Symptoms
- ABS and stability lights
- ABS disabled
- Traction control disabled
How to diagnose it step by step
- Compare wheel speeds.
- Inspect the wire.
- Test the sensor.
- Check the tone wheel.
- Replace the faulty part.
How to fix it
Same diagnosis as C0035 on the right front wheel.
Estimated repair cost
$80–220 installed.
Frequently asked questions
What does DTC code C0040 mean?
Right Front Wheel Speed Sensor Circuit.
Is code C0040 serious?
Severity High. Have it checked as soon as possible, especially if it affects safety or the catalytic converter.
Can I keep driving with code C0040?
Brakes work, but without ABS: drive carefully.
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