Poor power or earth supply to the fuel pump control module (corroded terminals, loose connections, voltage drop); Damaged wiring or connector between the engine control unit, the module and the fuel pump (chafing, water ingress, pin fretting); Faulty fuel pump control module (internal fault or overheating); Failing fuel pump drawing excess current or giving abnormal feedback, stressing the module; Blown fuse or faulty relay in the fuel pump circuit; Low battery voltage or charging system fault causing the module to report errors; Communication network fault or outdated control unit software affecting the module's signals (model dependent).

P064A

Fuel Pump Control Module A.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
4A: FaultThe specific fault in that area

What it means

P064A is the generic SAE J2012 code for a fault in Fuel Pump Control Module 'A', the separate unit that drives the electric fuel pump. The engine control unit sets it when it detects an internal fault in that module or a problem with its communication or feedback. Exact set conditions vary by manufacturer and model.

Symptoms

Malfunction indicator lamp on
Engine cranks but is hard to start or will not start
Engine hesitation, stumbling or loss of power under load
Intermittent stalling or cutting out
Engine running in limp mode with reduced power
Fuel pressure warning or related fuel system codes stored

Possible causes

Poor power or earth supply to the fuel pump control module (corroded terminals, loose connections, voltage drop)likely
Damaged wiring or connector between the engine control unit, the module and the fuel pump (chafing, water ingress, pin fretting)likely
Faulty fuel pump control module (internal fault or overheating)likely
Failing fuel pump drawing excess current or giving abnormal feedback, stressing the modulepossible
Blown fuse or faulty relay in the fuel pump circuitpossible
Low battery voltage or charging system fault causing the module to report errorspossible
Communication network fault or outdated control unit software affecting the module's signals (model dependent)rare

How to diagnose

Read all stored and pending codes and note freeze frame data; look for related fuel pressure, pump circuit or network codes
Check battery condition and charging voltage, as low voltage can cause spurious module faults
Inspect the fuel pump fuse and relay, and consult the model wiring diagram for the exact layout
Visually inspect the module, its connector and wiring (often near the fuel tank or under the rear seat or floor) for corrosion, water ingress, heat damage or chafing
Test power and earth supplies to the module under load, checking for voltage drop
Check the control signal between the engine control unit and the module, following the manufacturer's procedure for the specific vehicle
Measure fuel pump current draw and compare it with specification; also check fuel pressure against the manufacturer's figures
Check for relevant software updates or technical bulletins for the model and engine

How to fix

Clean and repair corroded or loose power and earth connections
Repair or replace damaged wiring and connectors, and seal against moisture
Replace a blown fuse or faulty relay after finding out why it failed
Replace the fuel pump if its current draw or pressure output is out of specification
Replace the fuel pump control module, and carry out any coding or adaptation the manufacturer requires
Update the control unit software where an outdated calibration is a known cause for that model

Can I keep driving?

High severity

Avoid driving if the engine is stalling, losing power or hard to start, as loss of fuel supply can be dangerous in traffic. If it runs normally and the fault is intermittent, drive only a short distance to get it checked promptly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.