Incorrect Shift from Gear 1
Starting from 1st gear, the TCM commanded a specific upshift but the resulting gear ratio matches a different gear. Wrong shift solenoid pattern actually engaged, or a stuck solenoid blocked the intended pattern.
Affected components
- Shift solenoids
- Valve body
Common causes
- High likelihood: Stuck shift solenoid
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.