GM Fault Code

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P025A

Extended Crank / Hard Start

System

Fuel System

Symptom

Extended Crank / Hard Start

Diagnosis & fix steps

LOGIC: Fuel Pump Module Control Circuit Open. ACTION: Locate the fuel pump driver module (FPDM). Perform a voltage drop test on the module's main power feed and ground circuit under load.

Red Seal field insights

Control Logic: Modern vehicles do not use a simple relay to power the fuel pump; they pulse-width modulate (PWM) a driver module. An open circuit cuts communication between PCM and pump.

Same code keeps coming back?

That's a program problem, not a part problem. Book a 30-minute uptime review with Grant, a Red Seal Heavy Duty Technician.

Book an uptime review

Read before you touch anything

  • This is general reference information, not a repair manual. It is for trained, qualified technicians.
  • Fault codes, meanings and procedures vary by model, serial number and software version. Confirm the code and the procedure against the manufacturer's service manual before acting.
  • Follow the OEM service manual, torque specs and your site's safety procedures: lockout/tagout, block raised equipment, relieve hydraulic, fuel and air pressure, and let hot systems cool.
  • You use this information at your own risk. Adventure Mechanical and AM Fleet Integrity accept no liability for damage, injury, downtime or loss arising from its use.
  • Not affiliated with or endorsed by any manufacturer. Brand names are used only to identify the equipment a code applies to.

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