Fuel Pump "B" Control Circuit /Open
P2632 indicates an open or disconnection in the Fuel Pump B control circuit, preventing the engine control module from properly commanding the secondary fuel pump. This code typically affects dual fuel pump systems and will prevent the engine from starting or running properly.
What You Might Notice
- Check engine light illuminated
- Engine won't start or cranks but fails to start
- Engine misfire, stalling, or dies under load
- Engine dies when reaching operating temperature
- Reduced fuel economy or no fuel delivery
Most Common Causes
- 1
Open or disconnected fuel pump B wiring
A break, loose connection, or disconnected wire in the fuel pump B control circuit prevents the ECU from sending the control signal to the pump.
- 2
Failed fuel pump B relay or control module
A defective relay or faulty fuel pump driver module cannot establish the circuit path needed to energize the secondary fuel pump.
- 3
Fuel pump B connector corrosion or damage
Corroded, burnt, or damaged connector pins break electrical continuity between the control module and the fuel pump assembly.
- 4
Failed fuel pump B motor
An internal short or open in the secondary fuel pump motor itself creates a circuit condition the ECU cannot complete.
How to Diagnose It
- 1
Check Open or disconnected fuel pump B wiring — A break, loose connection, or disconnected wire in the fuel pump B control circuit prevents the ECU from sending the control signal to the pump.
- 2
Check Failed fuel pump B relay or control module — A defective relay or faulty fuel pump driver module cannot establish the circuit path needed to energize the secondary fuel pump.
- 3
Check Fuel pump B connector corrosion or damage — Corroded, burnt, or damaged connector pins break electrical continuity between the control module and the fuel pump assembly.
- 4
Check Failed fuel pump B motor — An internal short or open in the secondary fuel pump motor itself creates a circuit condition the ECU cannot complete.
How to Fix It
- 1
Inspect and repair fuel pump B wiring harness
Trace the fuel pump B control circuit from the ECU to the pump, checking for breaks, loose connections, corrosion, or pinched wires. Repair or replace damaged wiring and secure loose connectors.
- 2
Test and replace fuel pump B relay
Use a multimeter to test the fuel pump relay for proper resistance and switching. If the relay fails continuity or resistance tests, replace it with a new unit rated for your vehicle.
- 3
Clean or replace fuel pump B connectors
Disconnect the fuel pump B connector and inspect for corrosion, pitting, or damage. Clean with electrical contact cleaner or replace the connector assembly if damaged.
- 4
Replace fuel pump B assembly
If wiring, relays, and connectors test good, the fuel pump motor itself is likely faulty. Replace the secondary fuel pump module or complete pump assembly.
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