P025D: Fuel Pump Module A Control Circuit High

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. P025D means the control circuit to pump module A reads high, typically a short to voltage. On Ford's 3.0 diesel the pump module detects it; on the 6.7 it means a short to voltage on the low side of the pump relay – both continuously monitored and set within 0.5 s. Depending on the design the pump then runs all the time or not at all.

Symptoms

• Check engine light on
• Pump runs all the time or not at all
• Starting problems

Most likely causes

• Control line shorted to battery voltage or another wire
• Moisture in the connector (leakage to voltage)
• Pump control module faulty
• Relay stuck or 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. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
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 P025D means

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

Frequently asked questions

Can I keep driving with code P025D?

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

What causes code P025D?

The most common causes are: control line shorted to battery voltage or another wire; moisture in the connector (leakage to voltage); pump control module faulty.

Related codes

• P025CFuel Pump Module A Control Circuit Low
• P025AFuel Pump Module A Control Circuit/Open
• P025BFuel Pump Module A Control Circuit Range/Performance
• P027DFuel Pump Module B Control Circuit High
• P0629Fuel Pump A Control Circuit High

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.