Powertrain
Definition only
Lights the check engine lamp
P2633: Fuel Pump B Control Circuit Low
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P2633 mean?
Voltage on the second fuel pump control line is below the expected window. Usually a short to ground or a shorted motor winding.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
Common causes
- High Control wire shorted to ground
- Medium Internal short in pump motor
- Low Connector pins corroded - high contact resistance
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2633 on the same make and model first.
P2633 in the community
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