Incorrect Gear Ratio
The ratio between input and output speed does not match any expected gear. Indicates slippage, valve body fault or sensor inaccuracy without identifying a specific gear.
Affected components
- Automatic transmission
- Valve body
- Speed sensor
Common causes
- High likelihood: Internal slippage
- Medium likelihood: Valve body fault
- Low likelihood: Speed sensor reading inaccurate
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
- Reduced-power or limp mode may occur
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.