Fuel Pump "A" Control Circuit Low

What it means

The engine computer (ECU) detected lower than expected voltage on the fuel pump control circuit. This usually comes from a control wire shorted to ground or a damaged relay coil, and it can stop the pump or make it work incorrectly.

Related codes: P0627P0629P0230P0087

Symptoms4

• Hard starting or no start.
• Stalling or hesitation under load.
• Check engine light on.
• Repeatedly blown fuel pump fuse at times.

Possible causes5

• Control circuit wire shorted to the body or ground through worn insulation.
• Damaged fuel pump relay coil.
• Moisture or corrosion in connectors, especially near the tank or under the vehicle.
• Faulty fuel pump control module on vehicles that have one.
• Faulty control circuit inside the engine computer (rare).

How to diagnose5

1. Check the pump fuse, and if it is blown, find the short to ground before replacing it.
2. Swap in an identical known-good relay to test.
3. Measure the resistance between the control wire and ground with both ends disconnected.
4. Inspect wiring under the vehicle and near the tank for chafing or damage.
5. Measure control voltage at the relay or pump module while it is commanded on.

How to fix5

1. Repair the wire shorted to ground and re-insulate and secure it.
2. Replace the pump relay if its coil is damaged.
3. Clean corroded connectors and protect them from moisture.
4. Replace the pump control module if proven faulty.
5. Clear the codes and confirm the pump runs and the code does not return.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low for a wire repair or relay, and rises if a pump control module or a new pump is needed.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions