P2632
Fuel Pump B Control Circuit / Open
The controller cannot drive the secondary fuel pump (B). Common on dual-tank trucks, GDI lift-pump systems, or alt-fuel installations — fault stops fuel delivery from this stage.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
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
Ordered by how often each turns out to be the cause.
- Open pump motor windingCommon
- Failed pump relayPossible
Parts involved
- Fuel Pump B
- Fuel Pump Relay B
- Wiring Harness
P2632 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.