What it means
A general fault in the second fuel pump control module (smart pump controller, separate from the ECU). Internal self-test failed or communication with the ECU is degraded.
At a glance
- Usually lights the check-engine light
How it works
Fuel pump control module B controls a second fuel pump or pump circuit and communicates with the engine control module. This code indicates that module B has failed a self-check or that its communication with the engine controller is unreliable, which can interrupt fuel delivery.
Common causes
Most likely first.
- Internal fault in the pump module
- Bus communication errors with ECU
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
How to diagnose it
- Use a scan tool to record freeze-frame data and check for fuel pressure, pump, voltage supply, and communication codes alongside P26EA.
- Check whether the vehicle has long cranking, stalling under load, or power loss, and compare commanded pump operation with available live data.
- Inspect module B's power, ground, connectors, and communication wiring for corrosion, water entry, loose pins, or harness damage.
- Test the module's power and ground under load and check the communication circuit using the manufacturer's wiring diagram and procedure.
- If power, ground, wiring, and bus communication are sound, run the manufacturer's module self-test or pump control test to confirm an internal module fault.
Common fixes
- Clean or repair poor power, ground, or connector connections at fuel pump control module B.
- Repair damaged communication wiring or connector terminals between module B and the engine controller.
- Repair a pump circuit or fuel delivery fault found during the specified control test.
- Replace fuel pump control module B if its internal fault is confirmed.
Can I keep driving?
Hard starting, stalling, or power loss can worsen if fuel delivery from the circuit controlled by module B becomes unreliable. Avoid high-load driving, and stop if the engine stalls or cannot maintain safe power.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.