Damaged, chafed or corroded wiring in the fuel pump control circuit, including a short to ground; Poor connection or water ingress at the fuel pump module or its connector; Faulty fuel pump control module or driver module; Failing fuel pump or its internal electronics drawing a fault on the control line; Blown fuse or relay fault in the fuel pump supply or control feed; Low battery voltage or poor earth connection affecting the module; Fault inside the engine control unit driver circuit.

P025C

Fuel Pump Module A Control Circuit Low.

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)
5C: FaultThe specific fault in that area

What it means

P025C is the generic code for a low signal 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 saw a voltage or signal level lower than expected, such as a short to ground or an open circuit. Exact circuit layout, and whether the pump is controlled by a separate module, varies by model and engine.

Symptoms

Engine cranks but will not start
Engine stalls or cuts out while driving
Loss of power or hesitation under load
Rough running or misfires from fuel starvation
Engine warning light on
Long cranking before the engine fires

Possible causes

Damaged, chafed or corroded wiring in the fuel pump control circuit, including a short to groundlikely
Poor connection or water ingress at the fuel pump module or its connectorlikely
Faulty fuel pump control module or driver modulepossible
Failing fuel pump or its internal electronics drawing a fault on the control linepossible
Blown fuse or relay fault in the fuel pump supply or control feedpossible
Low battery voltage or poor earth connection affecting the modulepossible
Fault inside the engine control unit driver circuitrare

How to diagnose

Read all stored codes and freeze frame data, noting engine speed, load and battery voltage when the fault set, and check for related fuel pressure or module communication codes
Check battery condition and charging voltage, as low voltage can upset control modules
Inspect the fuel pump module, its connector and wiring for damage, corrosion, water or chafing, following the model's wiring diagram
Check the relevant fuses and relays for the fuel pump and its control module
Check the earth connections for the fuel pump and control module for security and low resistance
With the ignition on, back-probe the control circuit and compare voltage or signal with the manufacturer's specification, as the expected value depends on the model
Test the wiring for continuity and for a short to ground with the connectors disconnected
Measure fuel pressure against specification and, if the wiring is sound, test the pump and control module following model-specific procedures

How to fix

Repair or replace damaged wiring and terminals in the control circuit
Clean, dry and refit connectors, replacing any that are corroded or loose
Replace a blown fuse or faulty relay after finding the reason it failed
Replace the fuel pump control module if it is confirmed faulty, with any coding or adaptation the model requires
Replace the fuel pump if it is confirmed to be causing the fault
Repair poor earths or charging problems affecting the system

Can I keep driving?

High severity

Avoid driving the car. Loss of fuel delivery can cause the engine to stall without warning, including in traffic, which is a safety risk.

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