P064A code meaning
Fuel Pump Control Module A
Powertrain system Generic code P06xx codes Check engine light
What P064A means
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 gasoline 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 gasoline 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.
P064A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P064A
- Check engine light (GM) or stored code only (Ford gasoline)
- 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)
Common causes of P064A
- Most likelyPump control module faulty internally (output stage, electronics)
- PossibleOutput stage overheating from a stiff or worn pump or poor module cooling
- PossibleSupply or ground fault or corrosion at the module (often on frame or tank)
- Less likelyDisturbed monitor line, so a wrong duty cycle is read
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel pump control moduleFuel pumpModule power supply
What each part of P064A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 4A | The exact fault in that area. |
What to do next
- Note P064A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P064A
What does P064A mean?
P064A means "Fuel Pump Control Module A". Demand-controlled fuel systems drive the pump through a separate pump control module; the engine module sets the target and reads its status back. It is a generic code, so it means the same on every make.
Is it safe to drive with P064A?
Drive gently and only to a workshop. With P064A the car can go into limp mode (reduced power) to protect itself.
Will P064A fail an emissions test?
Yes, it can. P064A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P064A to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P064A clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.