U0109

Lost Communication With Fuel Pump Control Module A

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Difficulty starting the engine
Unstable engine operation
Power Loss
Stalling engine
Check Engine Light Illuminates

Causes

Open or short circuit in the communication circuit
Problems with power supply to the fuel pump control module
Malfunction of the control module itself
Poor contact in connectors
Problems with the ECU

How to Fix

Check the integrity of the wiring harness and connectors
Check the power and ground of the control module
Scan the module for additional fault codes
If necessary, replace the fuel pump control module
Check the performance of the ECU

Related codes

U0100 U0101 U0121