P064A

Code

Generic P — Powertrain

Fuel Pump Control Module A

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 26 RU: 24

AI status

Completed

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Page language: EN

Causes

Blown fuse or faulty fuel pump relay
Low battery or poor battery connections
Open, short, or high resistance in wiring between PCM, FPCM and fuel pump
Corroded or loose connectors at the fuel pump, FPCM or PCM
Failed Fuel Pump Control Module (FPCM)
Failed fuel pump motor or internal pump short

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Extended cranking or no-start condition
Intermittent stalling or loss of driveability
Low or no fuel pressure at the rail
Fuel pump does not prime at key-on
Unusual fuel pump noise or no pump sound

What to check

Read freeze frame and full scan tool data; record related DTCs and live fuel rail pressure
Verify battery voltage at rest and during cranking (should be ~12–14.5 V)
Inspect fuel pump fuse(s), main relay(s) and fusebox connections
Visually inspect wiring and connectors from PCM to FPCM and pump for damage or corrosion
Check ground points for security and corrosion
Listen for pump prime on key-on; use a test light or voltmeter at pump connector

Signal parameters

Key-on battery voltage: typically 12.0–14.5 V
FPCM control input from PCM: switched/PWM signal 0–12 V, 0–100% duty cycle (frequency typically 20–200 Hz — vehicle dependent)
Fuel pump current draw: typically a few amps during steady run; peak inrush may be higher (approx. 2–15 A depending on pump)
Fuel rail pressure at key-on prime and idle: roughly 30–60 psi for many port-injected gasoline systems (vehicle dependent)
Communication: CAN/serial link between PCM and FPCM should be present and error-free

Diagnostic algorithm

Record all codes and freeze-frame data with a capable scan tool. Note related fuel system or communication codes.
Verify battery state: measure voltage at battery and at PCM power pins with key on and during crank. Charge or replace battery if low.
Visually inspect fuses, relays and harnesses for damage, corrosion, chafing or water ingress. Repair as needed.
With key ON (engine off) check for prime: verify voltage at the fuel pump connector and at the FPCM input/output. Do not short terminals.
Using a scope or multimeter, check for expected PWM/control signal from PCM to FPCM (or from FPCM to pump) while commanding pump on from the scan tool.
Measure current to the pump while cranking/running. Compare to known-good values; high current indicates mechanical bind/short, zero indicates open circuit or dead pump.
Measure fuel rail pressure during key-on prime, crank, and idle. If pressure is low but control signals are correct, suspect pump or pressure regulator.
Wiggle test wiring/connectors while monitoring live data to reproduce intermittent faults. Repair damaged wiring or connectors.
If wiring and power/ground are good and pump draws correct current but code persists, verify module/PCM software level and communication. Reflash or update per service information if applicable.
As a last step, substitute a known-good FPCM (or pump) and re-test. Replace the failed component and clear codes. Confirm repair by road test and re-check for codes.
Safety: relieve fuel pressure before disconnecting lines, disconnect battery when replacing control modules, and use eye/skin protection when working on fuel system.

Likely causes

Blown fuse, bad relay or low battery voltage preventing correct control
Corroded/loose connector or damaged wiring causing intermittent/poor signal
Failed fuel pump control module
Failed pump drawing excessive or no current
PCM communication or output driver fault (less common)

Fault status

⚠️ Status

Fuel Pump Control Module A — control/communication/performance fault detected. The fuel pump control circuit or module is reporting abnormal operation or out-of-range signal.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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