P1651
PPowertrainFuel Pump Monitor Circuit High
What does this code mean?
Severity : MediumP1651 reports a high voltage on the fuel pump monitor circuit. The engine control module watches this signal to confirm the pump is actually powered when it is commanded on. This is a manufacturer-specific code: the exact meaning depends on the manufacturer.
Symptoms
- Check engine light on.
- Occasional hard or long cranking.
- Possible stalling or hesitation while driving.
- No noticeable symptom in some cases.
Possible causes
- Fuel pump monitor wire shorted to a voltage source.
- Faulty fuel pump relay or pump control module.
- Corroded pump or relay connector.
- Failing fuel pump.
- Faulty engine control module, less often.
Diagnosis and repair
- Check the manufacturer documentation for the exact code definition.
- Inspect wiring and connectors at the pump and relay.
- Measure the monitor circuit voltage with a multimeter, key on and pump running.
- Test the relay or pump control module and replace the faulty part.
- Clear the code and road test.
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Code
P1651
Category
Powertrain
Prefix
P
Standard
OBD-II / SAE J2012