Shift Solenoid C Stuck On
Shift solenoid C remains hydraulically active when commanded off — the corresponding clutch or band cannot release, locking out shifts that depend on it. The TCM detects the missing release via gear-ratio error or output-shaft slip.
Affected components
- Shift solenoid c
- Valve body
Common causes
- High likelihood: Solenoid stuck open by debris
- Medium likelihood: Stuck valve spool
- Low likelihood: Carbon or debris buildup preventing free movement
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.