Shift solenoid A mechanically or electrically stuck on.
Common symptoms
- Wrong gear held
- Trans slip
- Check engine light
Typical causes
- Contaminated solenoid
- Valve body debris
- Failed solenoid
What scanner do you need?
Full-system scanner (engine, ABS, SRS, transmission, service resets)
Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.
Diagnostic tips
- Record freeze frame data when the code first sets
- Clear the code only after fixing the root cause
- Check for related pending codes that point to a common issue
- Verify battery voltage is above 12.4V before chasing sensor codes