Reductant Pump Motor Position Sensor Circuit Low
Voltage on the reductant pump motor position sensor signal line is below the expected window. Wire shorted to ground or sensor short.
Affected components
- Reductant pump motor position sensor
- Wiring harness
- Scr module
Common causes
- High likelihood: Signal wire shorted to ground
- Medium likelihood: Internal sensor short
- Low likelihood: Connector pins corroded - high contact resistance
Possible symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- 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.