C0091
4WD/AWD Power Transfer Unit Position Sensor A
C0091 is an OBD-II diagnostic trouble code meaning: 4WD/AWD Power Transfer Unit Position Sensor A. Common causes: position sensor malfunction, wiring harness damage. Estimated repair cost: $56–167.
Symptoms
- Incorrect operation of the all-wheel drive system
- Check engine light comes on
- The car goes into emergency mode
- Unusual noises from the transfer case
Causes
- Position sensor malfunction
- Wiring harness damage
- Poor contact in the sensor connector
- Mechanical damage to the transfer case
- Transmission control unit malfunction
How to Fix
- Check the integrity of the wiring harness
- Clean sensor contacts
- Check sensor resistance
- Replace position sensor if necessary
- Check the mechanical condition of the transfer case
Related codes
Error C0091 by Vehicle Brand
FAQ
What does the C0091 code mean?
C0091 is an OBD-II diagnostic trouble code that indicates: 4WD/AWD Power Transfer Unit Position Sensor A
What causes a C0091 error code?
The most common causes of C0091 include: Position sensor malfunction; Wiring harness damage; Poor contact in the sensor connector; Mechanical damage to the transfer case.
How do I fix a C0091 diagnostic trouble code?
To fix C0091: Check the integrity of the wiring harness. Clean sensor contacts. Check sensor resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0091?
Limited driving only, diagnose soon
How much does it cost to fix C0091?
The estimated repair cost for C0091 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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