U0109 Code - Lost Communication With Fuel Pump Control Module
Quick Answer
A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Fuel Pump Control Module, Fuel Pump Control Module harness is open or shorted, Fuel Pump Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U0109 indicates Lost Communication With Fuel Pump Control Module.
- Common causes
- Common causes include Faulty Fuel Pump Control Module, Fuel Pump Control Module harness is open or shorted, Fuel Pump Control Module circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code U0109 Description
What are the Possible Causes of the DTC U0109?
- Faulty Fuel Pump Control Module
- Fuel Pump Control Module harness is open or shorted
- Fuel Pump Control Module circuit poor electrical connection
How to Fix the DTC U0109?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U0109 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- U0109 Buick — Lost Communication With Fuel Pump Control Module
- U0109 Cadillac — Lost Communication With Fuel Pump Control Module
- U0109 Chevrolet — Lost Communication With Fuel Pump Control Module
- U0109 Ford — Lost Communication With Fuel Pump Control Module
- U0109 GMC — Lost Communication With Fuel Pump Control Module
- U0109 Hummer — Lost Communication With Fuel Pump Control Module
- U0109 Lincoln — Lost Communication With Fuel Pump Control Module
- U0109 Mercury — Lost Communication With Fuel Pump Control Module
- U0109 Pontiac — Lost Communication With Fuel Pump Control Module
- U0109 Saturn — Lost Communication With Fuel Pump Control Module
Frequently Asked Questions about U0109 Code
What does the OBDII code U0109 mean?
1. The U0109 code indicates a lost communication between the Powertrain Control Module (PCM) and the Fuel Pump Control Module (FPCM). 2.
What are the common symptoms of code U0109?
Symptoms may include engine stalling, failure to start, rough idling, poor fuel efficiency, or the fuel pump not running. 3.
What causes the U0109 code to appear?
Common causes include faulty wiring, damaged connectors, a defective Fuel Pump Control Module, or issues with the Powertrain Control Module. 4.
Can I drive my car with the U0109 code?
Driving with this code may not be safe if the engine stalls or the fuel pump fails. It's best to address the issue promptly. 5.
How do I diagnose the U0109 code?
Check the wiring and connectors for damage or corrosion, test the Fuel Pump Control Module, and ensure the PCM is functioning properly. 6.
Is a faulty Fuel Pump Control Module the only cause of code U0109?
No, other causes include communication circuit issues, software errors, or a malfunctioning PCM. 7.
How much does it cost to fix the U0109 code?
Repair costs vary but can range from $100 for wiring repairs to $500+ if the Fuel Pump Control Module needs replacement. 8.
Can a dead battery trigger code U0109?
Yes, a low-voltage or dead battery can disrupt communication between the modules and trigger this code. 9.
How do I reset the U0109 code?
The code can be reset with an OBDII scanner after repairing the underlying issue, but it may return if the problem persists. 10.
Does the U0109 code always mean the Fuel Pump Control Module needs replacement?
No, the module may not need replacement if the issue is with wiring, connectors, or the communication circuit.
Discuss the causes and fixes for U0109 OBDII Code
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