Faulty fuel pump module 'A' (internal pump motor or control electronics failure); Damaged or corroded wiring harness or connector at the fuel pump module; Open or short circuit in the control circuit between the PCM and fuel pump module; Failed fuel pump control module (FPCM) or relay, if equipped; PCM internal driver failure (rare but possible); Poor ground connection for the fuel pump module or FPCM; Aftermarket accessories or improper wiring repairs causing interference

DTC codes / P02xx · Fuel and air metering (injector circuits) / P025B

P025BFuel Pump Module A Control Circuit Range/Performance

Q: What does code P025B mean?

Fuel Pump Module A Control Circuit Range/Performance. P025B indicates that the powertrain control module (PCM) has detected an out-of-range or performance issue with the control circuit for fuel pump module 'A'. The PCM monitors the circuit for expected voltage or current behavior and sets this code when the signal does not match the commanded state, often due to a faulty module, wiring problem, or control driver issue.

P025B indicates that the powertrain control module (PCM) has detected an out-of-range or performance issue with the control circuit for fuel pump module 'A'. The PCM monitors the circuit for expected voltage or current behavior and sets this code when the signal does not match the commanded state, often due to a faulty module, wiring problem, or control driver issue.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illumination of the check engine light (malfunction indicator lamp) with no other noticeable symptoms
Engine cranks but fails to start or starts after long cranking
Intermittent engine stall or hesitation during acceleration
Reduced engine power or limp mode in some vehicles
Audible fuel pump operation may be absent when the key is turned on
Poor fuel economy or rich/lean fuel trim codes stored alongside

Common causes, most likely first

Faulty fuel pump module 'A' (internal pump motor or control electronics failure)
Damaged or corroded wiring harness or connector at the fuel pump module
Open or short circuit in the control circuit between the PCM and fuel pump module
Failed fuel pump control module (FPCM) or relay, if equipped
PCM internal driver failure (rare but possible)
Poor ground connection for the fuel pump module or FPCM
Aftermarket accessories or improper wiring repairs causing interference

How to diagnose and fix it

Verify battery voltage and inspect fuel pump module fuse and relay; replace if blown or faulty
Perform a visual inspection of the fuel pump module wiring and connector for damage, corrosion, or loose pins
Use a scan tool to command the fuel pump on and off while listening for pump operation and checking circuit voltage
Measure resistance and voltage drop on the control circuit between the PCM and fuel pump module to identify opens or shorts
Check the fuel pump module ground circuit for excessive resistance
If the circuit tests good, substitute a known-good fuel pump module or FPCM to confirm the fault
Repair or replace the faulty component (wiring, module, or PCM) and clear the code to verify the repair

Don't overlook the fuel pump control module

Many vehicles use a separate fuel pump control module (FPCM) that can fail and set P025B even when the fuel pump itself is healthy.
A weak or failing fuel pump motor can draw excessive current and trigger a range/performance code without completely failing.
Corrosion inside the fuel pump module connector is a common cause that is easily missed during a quick visual inspection.
P025B can be set by a low battery or charging system issue that causes voltage spikes or drops affecting the control circuit.
Some vehicles require a relearn or calibration procedure after replacing the fuel pump module or FPCM to prevent the code from returning.

Can I keep driving with P025B?

If the engine starts and runs normally, you can drive cautiously to a repair shop, but avoid hard acceleration or long trips. If the engine stalls or fails to start, do not drive and have the vehicle towed to prevent safety risks.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.