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OBD Code U0109

Lost Communication with Fuel Pump Module

CodeU0109
DescriptionLost Communication with Fuel Pump Module
Possible CausesFuel pump driver module; CAN wiring; Module power
SymptomsNo fuel; No start; Stalling
SystemNetwork

What Does U0109 Mean?

Lost Communication with Fuel Pump Module. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the network.

Code Breakdown

U = Network code

0 = Generic (SAE standard)

How to Fix U0109

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Turn the key to ON (do not start) and listen for the fuel pump hum from the tank area (2-3 seconds).
  2. Test fuel pressure at the rail with a gauge — compare to spec.
  3. Check the fuel pump relay and fuse in the fuse box.
  4. Inspect wiring and connector at the fuel pump (typically accessed through a panel under the rear seat or by dropping the tank).
  5. If pressure is low or absent, replace the fuel pump assembly.
  6. Replace the fuel filter at the same time if accessible.
  7. Clear codes and verify proper pressure at idle and under load.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is U0109 serious?

Yes, U0109 is considered a high-severity code. You should have it diagnosed and repaired as soon as possible. Driving with this code active may cause further damage to your vehicle or pose a safety risk.

Can I clear U0109 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return, usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix U0109?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool, not just reading the code, is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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