U0109 Cadillac 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 Cadillac 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 Cadillac Description
What are the Possible Causes of the DTC U0109 Cadillac?
- 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 Cadillac?
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 Cadillac Escalade Models
2007-2010 Cadillac XLR
2009-2010 Cadillac Escalade Hybrid
Cadillac Factory Service Bulletin OBDII Code U0109
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U0109 Cadillac 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 Cadillac Code
1. What are the common symptoms of OBDII code U0109 in a Cadillac related to the fuel pump control module?
- Common symptoms include issues with starting the vehicle, stalling, poor engine performance, and fuel pump malfunctions.
2. What are the possible causes of the U0109 code indicating lost communication with the fuel pump control module in a Cadillac?
- The code U0109 can be triggered by wiring issues, a faulty fuel pump control module, a defective fuel pump, or problems with the powertrain control module (PCM).
3. How can I diagnose the U0109 code in my Cadillac related to the fuel pump control module?
- Diagnosing the U0109 code involves checking the wiring connections, inspecting the fuel pump control module, testing the fuel pump, and scanning the PCM for related faults.
4. Can I continue driving my Cadillac if the U0109 code for lost communication with the fuel pump control module appears?
- It is not recommended to drive the vehicle when the U0109 code is present, as it can lead to potential safety hazards and further damage to the fuel system.
5. What are some repair tips for resolving the U0109 code in a Cadillac due to lost communication with the fuel pump control module?
- Repair tips include checking and repairing any damaged wiring, replacing the fuel pump control module if necessary, and ensuring proper communication among the components.
6. Are there any recalls or technical service bulletins related to the U0109 code in Cadillacs?
- It is advisable to check with a Cadillac dealership or online resources for any recalls or technical service bulletins pertaining to the U0109 code and the fuel pump control module.
7. Can a DIY enthusiast fix the U0109 code related to the fuel pump control module in a Cadillac?
- While some basic diagnostics can be done by DIY enthusiasts, resolving the U0109 code may require advanced tools and expertise, so it is recommended to consult a professional mechanic.
8. How much does it typically cost to repair the U0109 code for lost communication with the fuel pump control module in a Cadillac?
- The cost of repairing the U0109 code can vary depending on the underlying issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
9. Will resetting the OBDII code U0109 in a Cadillac resolve the issue related to the fuel pump control module?
- Resetting the code may temporarily clear the fault, but if the underlying issue causing the U0109 code is not addressed, it is likely to reappear, indicating an ongoing problem with the fuel pump control module.
10. How important is it to address the U0109 code indicating lost communication with the fuel pump control module in a Cadillac promptly?
- It is crucial to address the U0109 code promptly to prevent potential fuel system failures, engine performance issues, and safety concerns while driving the vehicle.
Discuss the causes and fixes for U0109 Cadillac OBDII Code
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my 93 cadillac sedan deville 4.9 v8 has a low and rough idle and started stalling stalling
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what the hell is wrong with my 93 cadillac 4.9 v8 it has a rough idle speed and stalling
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Unfortunately there are many things that could be wrong. You could start by replacing the spark plugs
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