What it means
Fuel pump module A control voltage above expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
- The engine or gearbox may go into limp mode
How it works
Fuel Pump Module A uses a control circuit to regulate fuel-pump operation, and the engine control module monitors the signal on that circuit. P025D sets when the control-circuit voltage is higher than expected, which can interfere with correct pump control.
Common causes
Most likely first.
- Wiring shorted to battery
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
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
- Save freeze-frame data and review fuel-pump command and status data to see when the high-signal condition was recorded.
- Inspect Module A's harness for pinched or damaged wiring near battery-positive feeds, and check the connector for corrosion or loose pins.
- Test the control wire for a short to battery voltage using the manufacturer's wiring diagram and procedure.
- Measure the control-circuit signal at the module connector under the relevant command and compare it with the manufacturer's specification.
- If the circuit is sound, test Module A and its power and ground connections for an internal fault.
Common fixes
- Repair a control wire pinched against a battery-positive source.
- Replace damaged wiring that has shorted to supply.
- Clean or replace corroded or loose connector terminals.
- Replace Fuel Pump Module A if its circuit output remains high with wiring verified.
Can I keep driving?
Hard starting, stalling, or power loss can make the vehicle unsafe to accelerate or merge. Limit driving and stop if the engine stalls or fuel delivery becomes unreliable.
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.