C1040
Rear Wheel Speed Comparative Performance
C1040 is an OBD-II diagnostic trouble code meaning: Rear Wheel Speed Comparative Performance. Common causes: wheel speed sensor malfunction, damage to the wiring or sensor connector. Estimated repair cost: $56–167.
Symptoms
- The ABS/ESP indicator on the dashboard lights up
- Disabling ABS and ESP
- Unstable behavior of the car when braking
Causes
- Wheel speed sensor malfunction
- Damage to the wiring or sensor connector
- Rear tire pressure difference
- Damage to drives or wheel bearings
- Problems with the ABS/ESP control unit
How to Fix
- Check the pressure in the rear tires
- Visually inspect the speed sensors and their wiring
- Check speed sensor readings using a diagnostic scanner
- Replace a faulty speed sensor or repair damaged wiring
- Test the ABS/ESP system after repair
Related codes
FAQ
What does the C1040 code mean?
C1040 is an OBD-II diagnostic trouble code that indicates: Rear Wheel Speed Comparative Performance
What causes a C1040 error code?
The most common causes of C1040 include: Wheel speed sensor malfunction; Damage to the wiring or sensor connector; Rear tire pressure difference; Damage to drives or wheel bearings.
How do I fix a C1040 diagnostic trouble code?
To fix C1040: Check the pressure in the rear tires. Visually inspect the speed sensors and their wiring. Check speed sensor readings using a diagnostic scanner. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1040?
Limited driving only, diagnose soon
How much does it cost to fix C1040?
The estimated repair cost for C1040 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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