C0403
AWD Oil Filter Reverse Valve Stuck Open
C0403 is an OBD-II diagnostic trouble code meaning: AWD Oil Filter Reverse Valve Stuck Open. Common causes: oil contamination, mechanical valve wear. Estimated repair cost: $56–167.
Symptoms
- Check Engine Light Is On
- Reduced all-wheel drive efficiency
- Unusual noises from the transmission area
Causes
- Oil contamination
- Mechanical valve wear
- Foreign particles entering the valve
- Poor oil quality or late replacement
How to Fix
- Check the oil level and condition in the all-wheel drive system
- Change oil and oil filter
- Check the operation of the check valve
- If necessary, replace the valve or the entire oil filter assembly
Related codes
Error C0403 by Vehicle Brand
FAQ
What does the C0403 code mean?
C0403 is an OBD-II diagnostic trouble code that indicates: AWD Oil Filter Reverse Valve Stuck Open
What causes a C0403 error code?
The most common causes of C0403 include: Oil contamination; Mechanical valve wear; Foreign particles entering the valve; Poor oil quality or late replacement.
How do I fix a C0403 diagnostic trouble code?
To fix C0403: Check the oil level and condition in the all-wheel drive system. Change oil and oil filter. Check the operation of the check valve. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0403?
Limited driving only, diagnose soon
How much does it cost to fix C0403?
The estimated repair cost for C0403 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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