P025D

Code

Generic P — Powertrain

Fuel Pump Module A Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 32 RU: 27

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Page language: EN

Causes

Short to battery voltage on the pump control circuit
Open/poor ground or supply wiring to pump module
Corroded or damaged connector at fuel pump module
Failed fuel pump module (internal driver)
Faulty relay or fuse supplying pump control
PCM/ECM driver transistor failure or internal fault

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
No-crank no-start or hard start (if pump not commanded correctly)
Engine stalls or poor running due to incorrect fuel delivery
Fuel pump runs continuously or will not run depending on failure mode
Unusual battery drain or reduced fuel economy (if pump runs continuously)

What to check

Read and record freeze-frame and freeze-frame data for voltage and conditions
Verify battery voltage and state of charge
Visually inspect fuel pump module connector and in-tank wiring for corrosion, bent pins, or water intrusion
Check fuel pump fuse and relay operation
Check for other related stored DTCs (fuel rail pressure, pump control)
Note when the DTC sets (key ON, cranking, running)

Signal parameters

Expected control-circuit voltage: near 0 V when the ECM commands LOW (ground) and near battery voltage when open/not driven — refer to vehicle-specific values
Supply voltage at pump supply terminal: ~12 V (battery voltage) with key ON
Control/driver output is typically low-side switching (ECM grounds to run pump) — high on control circuit indicates loss of expected low-side drive or short to B+
Pump coil/module resistance: low ohms (typically

Diagnostic algorithm

Connect a scan tool and confirm P025D present; record freeze-frame data and any additional fuel system codes
Check battery voltage (should be >12 V) and inspect/replace weak battery if necessary
Visually inspect the fuel pump module connector, wiring, and chassis grounds for damage, corrosion, loose pins, or water intrusion; repair as needed
Check fuses and fuel pump relay: swap known-good relay (if applicable) and re-test
With key ON (engine OFF) measure voltage at the pump module control pin/wire: if it reads near battery voltage when ECM should command LOW, suspect a short to B+ or stuck relay
Back-probe control circuit while commanding pump ON with a scan tool: expected result is ECM grounding the control (voltage drops toward 0 V). If control remains HIGH, disconnect the pump connector and observe if voltage changes — if it falls to expected values, fault is downstream (harness/module). If it remains HIGH with connector disconnected, suspect ECM/relay or short to B+
Perform a wiggle test on wiring while monitoring voltage to find intermittent faults
Measure current draw at the pump: excessive or continuous draw indicates pump running or short; open circuit indicates no pump operation
If wiring and connectors test good and harness repairs do not clear the condition, bench-test or replace the fuel pump module. If pump module replacement does not resolve the DTC, suspect PCM/ECM driver failure and consider module-level diagnostics or replacement per vehicle procedures
Clear codes and verify repair by cycling key, cranking, and a road test; re-scan to confirm no reoccurrence