Upshift Switch Circuit
The TCM detects an electrical fault on the manual upshift request switch (paddle or +/- lever) circuit.
Affected components
- Upshift switch
- Wiring harness
Common causes
- High likelihood: Switch contacts failed
- Medium likelihood: Wiring open
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
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.