U0109 GMC Code - Lost Communication With Fuel Pump Control Module
Quick Answer
Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. 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 GMC 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 GMC Description
What are the Possible Causes of the DTC U0109 GMC?
- 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 GMC?
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.
Code Tech Notes
2007-2010 GMC Sierra
2007-2010 GMC Yukon Models
2008-2010 GMC Sierra Hybrid
2008-2010 GMC Yukon Hybrid
GMC Factory Service Bulletin OBDII Code U0109
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U0109 GMC 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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Frequently Asked Questions about U0109 GMC Code
1. What does the OBDII code U0109 GMC indicate?
The code U0109 GMC signifies a communication problem between the vehicle's engine control module (ECM) and the fuel pump control module.
2. What are common symptoms of the U0109 GMC code?
Common symptoms include issues with starting the vehicle, engine stalling, poor fuel efficiency, and sometimes the vehicle not starting at all.
3. What are potential causes of the U0109 GMC code?
Potential causes include a faulty fuel pump control module, damaged wiring or connectors in the communication network, software issues, or a malfunctioning ECM.
4. How can I diagnose the U0109 GMC code?
Diagnosing this code typically involves using a professional OBDII scanner to retrieve the code, checking for any associated codes, and performing a thorough inspection of the fuel pump control module and related wiring.
5. Can I still drive my vehicle with the U0109 GMC code?
It is generally not recommended to drive the vehicle when this code is present, as it can lead to potential safety hazards and further damage to the vehicle's components.
6. How can I repair the U0109 GMC code?
Repairing this code usually involves addressing the root cause, which may include replacing the fuel pump control module, repairing damaged wiring, or reprogramming the ECM.
7. Is it possible to reset the U0109 GMC code without repairs?
While clearing the code temporarily may be possible by using an OBDII scanner, it is essential to address the underlying issue to prevent the code from reappearing.
8. Are there any DIY tips for fixing the U0109 GMC code?
DIY tips may include checking for loose connections, inspecting the wiring harness for damage, and ensuring all components related to the fuel pump control module are securely in place.
9. Can a mechanic help with the U0109 GMC code repair?
Yes, a qualified mechanic or automotive technician can help diagnose and repair the U0109 GMC code using their expertise and specialized tools.
10. How much does it cost to fix the U0109 GMC code?
The cost of fixing the U0109 GMC code can vary depending on the extent of the issue, the parts needed for repair, and the labor rates of the service provider. It's advisable to get estimates from different repair shops.
Discuss the causes and fixes for U0109 GMC OBDII Code
-
my 2014 acadia has code UO 109 but runs great. Can I expect fuel pump failure?
-
No, more like a Fuel Pump Control Module problem. I suggest clearing the code first and if possible inspect the Fuel Pump Control Module connector, make sure none of the pins are not burnt out or black
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