Error code
OBD2 U0109
OBD2U0109
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Lost Communication With Fuel Pump Control Module.
Severity
highThe vehicle may still be drivable, but performance and safety could be compromised. It is recommended to address this issue promptly.
Summary
U0109 indicates that there is no communication between the car's computer system and the fuel pump control module. This issue affects the data bus connected to the fuel pump.
Common Causes
- Faulty or damaged wiring harness connecting the fuel pump control module
- Fuel pump control module failure
- Data bus communication issues
Fixes
FAQ
What should I do if my car shows U0109?
You should have a professional mechanic diagnose the issue, as it involves checking the wiring and fuel pump control module for any faults or damage.
Is there a specific tool recommended to read this code?
We recommend using Torque Pro, an app available on Google Play Store, to read diagnostic trouble codes.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- U0100Lost Communication With ECM/PCM A
- U0101Lost Communication with TCM
- U0102Lost Communication with Transfer Case Control Module
- U0103Lost Communication With Gear Shift Module
- U0104Lost Communication With Cruise Control Module
- U0105Lost Communication With Fuel Injector Control Module
- U0106Lost Communication With Glow Plug Control Module
- U0107Lost Communication With Throttle Actuator Control Module
- U0108Lost Communication With Alternative Fuel Control Module
- U0110Lost Communication With Drive Motor Control Module
- U0111Lost Communication With Battery Energy Control Module 'A'
- U0112Lost Communication With Battery Energy Control Module 'B'