U0109
Lost Communication With Fuel Pump Control Module A
U0109 is an OBD-II diagnostic trouble code meaning: Lost Communication With Fuel Pump Control Module A. Common causes: open or short circuit in the communication circuit, problems with power supply to the fuel pump control module. Estimated repair cost: $56โ167.
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
Error U0109 by Vehicle Brand
FAQ
What does the U0109 code mean?
U0109 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Fuel Pump Control Module A
What causes a U0109 error code?
The most common causes of U0109 include: 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.
How do I fix a U0109 diagnostic trouble code?
To fix U0109: 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. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0109?
Do not drive โ repair immediately
How much does it cost to fix U0109?
The estimated repair cost for U0109 is $56โ167. Actual cost depends on your vehicle, location, and labor rates.
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