Powertrain
generic / SAE
P2633
Fuel Pump B Control Circuit Low
Voltage on the second fuel pump control line is below the expected window. Usually a short to ground or a shorted motor winding.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number6 / 33
Possible causes
- Control wire shorted to ground high
- Internal short in pump motor medium
- Connector pins corroded - high contact resistance low
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 180–1000 €
- Estimated time: 0.8–3.5 h
- Component: fuel pump b
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012