Powertrain, generic · Computer and auxiliary outputs

P064A Fuel Pump Control Module A

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Demand-controlled fuel systems drive the pump through a separate pump control module; the engine module sets the target and reads its status back. P064A means this module reports an internal fault. Ford petrol engines encode the status as a duty cycle on a monitor line – 30 % (±4 %) means internal driver fault, 20 % invalid data (P025B), no signal U0109 – and set the code after 2–5 s; Ford's 2023 diesel checks the period of the monitor signal (0–1.2 s, 0.5 s). GM's pump module sets P064A when its output stage exceeds 150 °C (3 of 15 samples), with the lamp after two trips; Ford petrol stores it without the lamp. Pump output may be reduced or switched off, so low fuel pressure, stalling or a no-start can follow. A stiff, worn pump drawing high current can overheat the module.

Likely causes

Pump control module faulty internally (output stage, electronics)
Output stage overheating from a stiff or worn pump or poor module cooling
Supply or ground fault or corrosion at the module (often on frame or tank)
Disturbed monitor line, so a wrong duty cycle is read

Symptoms

  • Check engine light (GM) or stored code only (Ford petrol)
  • Hard start, stumbling or lack of power from low fuel pressure
  • Stalling or no start if the pump is switched off
  • Fuel pressure codes as well (e.g. P0087)

Repair estimate

DifficultyMediumDIY possible
Parts and labour€150–600
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel pump control modulefuel pumpmodule power supply

Related codes

P025AP025BP0627P062AP0230P0628

References: law.cornell.edu, fordservicecontent.com, fordservicecontent.com, gsi.ext.gm.com.