P025A: Fuel Pump Module A Control Circuit/Open

On demand-controlled fuel systems the engine module does not drive the pump itself but sends a pump control module the desired pump output on a separate control line, usually as a duty cycle; the module reports back on a monitor line or via CAN. P025A means the control line from the engine module to pump module A is open or faulty. On Ford systems the pump module itself detects the bad command signal and reports it on the monitor line (11–16 V, 2–5 s); Ford uses P025A for the shared line to modules A and B. GM's pump module compares the enable line with the request on the data bus and sets P025A after about 1 s, with the warning light in the first trip; on some Ford vehicles the code does not light it.

Symptoms

• Check engine light (manufacturer-dependent)
• Hard or no start
• Rough idle, surging
• Lack of power from wrong fuel pressure

Most likely causes

• Control line to the pump module open or shorted, often along the frame
• Connector at the pump module corroded or wet (module often mounted on the frame)
• Pump control module faulty (input)
• Module ground or supply poor
• Engine module output faulty

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the pump's fuse, relay, and connector
2. Check the continuity of the wire between the component and the control module.
3. Replace the filter if it is due for maintenance
4. Compare commanded and actual pressure in live data
5. Measure the pressure with a suitable gauge
6. Check the sensor and regulator before replacing the pump

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P025A means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 2: Fuel injection
• 5A: Specific fault in that system

Frequently asked questions

Can I keep driving with code P025A?

Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.

What causes code P025A?

The most common causes are: control line to the pump module open or shorted, often along the frame; connector at the pump module corroded or wet (module often mounted on the frame); pump control module faulty (input).

Related codes

• P025BFuel Pump Module A Control Circuit Range/Performance
• P025CFuel Pump Module A Control Circuit Low
• P025DFuel Pump Module A Control Circuit High
• P027AFuel Pump Module B Control Circuit/Open
• P0627Fuel Pump A Control Circuit/Open
• P064AFuel Pump Control Module A

Sources

• law.cornell.edu: 13 CCR 1968.2
• fordservicecontent.com: OBD Operations Summary Gasoline 2020 2023
• newtonnet.co.uk: fordobd2012
• gsi.ext.gm.com: 18OBDG03A Engine Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.