Up and Down Shift Switch Circuit Low
Up/down shift switch input reads stuck low — short to ground or stuck-pressed paddle/button. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Affected components
- Paddle shifters
Common causes
- High likelihood: Switch wire shorted to ground
- Medium likelihood: Stuck paddle/button
- Low likelihood: Connector pins corroded - high contact resistance
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.