Fault in the fuel pump control module or driver, such as an internal failure; Damaged, chafed or corroded wiring in the fuel pump control circuit, including a short to voltage; Poor connections or water ingress at the fuel pump module or control module connector; Faulty fuel pump or pump assembly drawing abnormal current and upsetting the circuit; Low battery voltage or charging system fault causing incorrect circuit readings; Fault in the engine control unit or outdated software, where the manufacturer has identified this as a known issue.

P025D

Fuel Pump Module A Control Circuit High.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
5D: FaultThe specific fault in that area

What it means

P025D is the generic code for a high condition in the control circuit of fuel pump module A. The engine control unit commands the fuel pump control module and monitors the circuit, and it has seen a voltage or signal level higher than expected for the command it sent. The exact layout of the circuit (PWM, serial or discrete signal) depends on the vehicle and engine.

Symptoms

Malfunction indicator lamp on
Engine cranks but is hard to start or will not start
Engine stalls or hesitates under load
Loss of power or limp mode
Rough running or surging due to poor fuel pressure

Possible causes

Fault in the fuel pump control module or driver, such as an internal failurelikely
Damaged, chafed or corroded wiring in the fuel pump control circuit, including a short to voltagelikely
Poor connections or water ingress at the fuel pump module or control module connectorpossible
Faulty fuel pump or pump assembly drawing abnormal current and upsetting the circuitpossible
Low battery voltage or charging system fault causing incorrect circuit readingspossible
Fault in the engine control unit or outdated software, where the manufacturer has identified this as a known issuerare

How to diagnose

Read all stored codes and freeze frame data, noting battery voltage, engine speed and load when the fault set, and check for related fuel pressure or battery voltage codes
Check battery condition and charging voltage, as low or unstable voltage can upset the pump control circuit
Visually inspect the fuel pump module wiring and connectors for damage, corrosion, water ingress and pin tension, especially near the fuel tank and under the rear seat or floor
Check the fuel pump control module's power and earth supplies, plus fuses and relays, using the wiring diagram for the vehicle
Using the wiring diagram, test the control signal wire for a short to voltage and for continuity between the engine control unit and the pump control module
Monitor commanded and actual fuel pressure in live data, as available on the model, and compare them with specification
Test the fuel pump current draw and operation to see if the pump or its module is at fault
Check for manufacturer software updates or technical bulletins for the engine and model

How to fix

Repair or replace damaged wiring and fix any short to voltage in the control circuit
Clean, repair or replace corroded or loose connectors and terminals
Replace the fuel pump control module if it is confirmed faulty
Replace the fuel pump or pump assembly if it is faulty or drawing abnormal current
Restore correct battery and charging system performance
Update the engine control unit software only where an outdated calibration is a known cause for this model

Can I keep driving?

High severity

Avoid driving the car if it is stalling, losing power or struggling to start, as a sudden loss of fuel supply is a safety risk. If it runs normally, only drive it a short distance to get it repaired.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.