C0040Severity: Medium
C0040 – Right Front Wheel Speed Sensor Circuit
The right front wheel speed sensor signal is faulty/missing.
What it means
The ABS module can't get a valid signal from the right front wheel's speed sensor. ABS/ESP and traction control may be disabled; normal braking still works.
Symptoms
- ABS/ESP warning lights
- ABS disabled
- Issues in speed-based systems
Common causes
- Faulty wheel speed sensor
- Dirty/damaged reluctor ring
- Wiring/connector issue
- Bearing/sensor gap
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Frequently asked questions
What does trouble code C0040 mean?
C0040 – Right Front Wheel Speed Sensor Circuit. The ABS module can't get a valid signal from the right front wheel's speed sensor. ABS/ESP and traction control may be disabled; normal braking still works.
Can I drive with a C0040 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.