What it means
A general fault is detected on the dedicated fuel pump control module A. Used on PWM-controlled returnless fuel systems to vary pump speed against demand. The module reports an internal performance issue.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Fuel pump control module A varies the electric pump's output to meet engine fuel demand in systems that use a separate pump controller. The engine control module monitors the module's reported operation and sets this code when it detects a general performance fault in module A, rather than identifying a specific pump speed or circuit voltage.
Common causes
Most likely first.
- Fuel-pump control-module power or ground fault
- Open, shorted, or high-resistance module wiring
- Poor module connector contact
- Internal fuel-pump control-module fault
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
How to diagnose it
- Save freeze-frame data and scan the engine and fuel-pump modules for supply, communication, and fuel-pressure codes before clearing anything.
- Compare commanded and reported fuel-pump operation and fuel pressure at idle and during the conditions shown in freeze-frame data.
- Inspect module A's power, ground, connector, and harness for corrosion, water entry, loose terminals, chafing, or heat damage.
- Check module supply and ground under load, then test its wiring for opens, shorts, or excessive resistance against the manufacturer's specification.
- If the electrical checks pass, verify fuel pressure and pump response under load to distinguish a module fault from a pump or fuel-delivery problem.
- If the pump and wiring respond correctly but module A continues to report an internal fault, check for applicable software updates and assess the module.
Common fixes
- Clean and secure corroded or loose fuel-pump control module A connectors and grounds.
- Repair damaged power, ground, or control wiring to module A.
- Replace a failed fuel pump if pressure or flow tests confirm it cannot meet demand.
- Update module software where an applicable manufacturer fix exists.
- Replace fuel-pump control module A if its supply and wiring are sound and its internal fault is confirmed.
Can I keep driving?
Hard starting, stalling, or loss of power under load can leave the vehicle unable to move safely, so avoid high-speed trips and heavy acceleration. Stop driving if it stalls or cannot maintain fuel delivery; continued operation can cause repeated stalls and worsening drivability.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.