C0515moderate severityChassis
Transfer Case Encoder Ring Circuit
on 2000 Volvo S80 2.9L I6 · AWD
What this code means
Malfunction in the transfer case encoder motor position feedback sensor.
Symptoms
- 4WD indicator incorrect
- Cannot verify shift completion
- Service 4WD message
- Shift hunts back and forth
Common causes
- Encoder ring sensor failure
- Encoder contaminated with metal particles
- Wiring damage
- Shift motor assembly failure
Diagnostic steps
- Read encoder position with scan tool
- Command shift and watch encoder response
- Inspect encoder wiring
- Check transfer case fluid for metal contamination
- Test encoder sensor output
Repair notes
Replace encoder motor assembly. Flush transfer case if fluid is contaminated.
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