P025C: Fuel Pump Module A Control Circuit Low

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. P025C means the control circuit to pump module A reads low, typically a short to ground. On Ford's 3.0 diesel the pump module detects it; on the 6.7 it means a short on the low side of the pump relay – both within 0.5 s. FCA documents it with the warning light on and sometimes a start followed by stalling, often together with P01C6 and P016F; the checks cover the pump module connector, the low-pressure sensor and a ground point for water, corrosion and pushed-back pins.

Symptoms

• Check engine light on
• Engine starts and dies again
• Starting problems
• Loss of power from low supply pressure

Most likely causes

• Control line chafed to ground at the frame
• Water or corrosion at the pump module connector
• Ground point loose or corroded
• Pump control module faulty internally
• Pump relay faulty (Ford 6.7)

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. With the connector unplugged, check whether the signal wire is making contact with ground.
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 P025C means

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

Frequently asked questions

Can I keep driving with code P025C?

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

What causes code P025C?

The most common causes are: control line chafed to ground at the frame; water or corrosion at the pump module connector; ground point loose or corroded.

Related codes

• P025DFuel Pump Module A Control Circuit High
• P025AFuel Pump Module A Control Circuit/Open
• P025BFuel Pump Module A Control Circuit Range/Performance
• P027CFuel Pump Module B Control Circuit Low
• P0628Fuel Pump A Control Circuit Low
• P016FClosed Loop Fuel Pressure Control At Limit - Pressure Too Low

Sources

• law.cornell.edu: 13 CCR 1968.2
• fordservicecontent.com: obd summary diesel 2023
• static.nhtsa.gov: MC 10227984 9999

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.