Lost Communication With Fuel Pump Control Module

What it means

The engine computer (ECU) or another module has stopped receiving messages from the fuel pump control module over the CAN bus. On vehicles that have it, this module controls pump speed and fuel pressure, and when it is lost the engine may not start or may stall. The cause is usually module power, a connector exposed to moisture or the bus wiring, and several U codes together point to a bus or battery problem.

Related codes: P0627P0230P0087U0100U0001P0562

Symptoms5

• No start or hard starting.
• Engine stalling while driving or when stopping.
• Loss of power or stumbling on acceleration.
• Check engine light on, sometimes with fuel pressure codes.
• No fuel pump sound when the key is turned to on.

Possible causes6

• Module connector or wiring corroded by moisture or water, since it is often near the tank or under the vehicle.
• Blown module power fuse or faulty relay.
• Poor module ground.
• Weak battery or loose terminals.
• Open or shorted bus wiring to the module.
• Internal module failure from heat or corrosion.

How to diagnose5

1. Read codes from all modules; if many modules report lost communication, start with the battery and the bus, and if only the fuel pump control module is missing, focus on it.
2. Try to communicate with the fuel pump control module directly with a scan tool; no response points to lost power, ground or wiring to it.
3. Locate the fuel pump control module from the manufacturer information, which on some vehicles sits near the fuel tank, in the trunk or under the rear seat, while other vehicles have no separate module at all, then check its power fuse and measure power and ground at its connector.
4. Inspect the module connector for water, corrosion or loose terminals, and check the bus wiring to it.
5. Disconnect the battery and measure resistance between the CAN bus wires at the module connector, comparing with the manufacturer specification to find an open or short.

How to fix6

1. Charge or replace the battery, and clean and tighten its terminals.
2. Replace the blown fuse after finding why it blew.
3. Clean the module connector and repair the ground or damaged bus wiring.
4. Update the module software if the manufacturer has an update.
5. Replace the fuel pump control module if proven faulty with good power and bus wiring, then program and code it to the vehicle.
6. Clear codes in all modules and confirm 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 fuse or corroded connector, rises if the wiring near the tank is damaged, and is highest if the module must be replaced and programmed.

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