Input/Turbine Speed Sensor "A" Circuit Range/Performance
The transmission input/turbine speed sensor signal is implausible compared to engine RPM and current gear ratio. Often caused by a failing sensor, debris on the reluctor, or wiring noise.
Affected components
- Transmission input speed sensor
- Sensor wiring
Common causes
- High likelihood: Input speed sensor failed
- Medium likelihood: Wiring/connector fault
- Low likelihood: Sensor element aged beyond calibration window
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
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.