U2139 GMC Code - Lost Communication With Column Integration Module
Quick Answer
The U2139 GMC code indicates that there is a communication error between the vehicle's engine control module (ECM) and the column integration module (CIM). Common causes include Faulty wiring connections, Damaged wiring harnesses, Malfunctioning CIM. 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
- U2139 GMC indicates Lost Communication With Column Integration Module.
- Common causes
- Common causes include Faulty wiring connections, Damaged wiring harnesses, Malfunctioning CIM.
- 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.
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Code U2139 GMC Description
The U2139 GMC code indicates that there is a communication error between the vehicle's engine control module (ECM) and the column integration module (CIM). The CIM is responsible for controlling various functions related to the steering column, such as the turn signals, windshield wipers, and cruise control. When communication is lost between the ECM and CIM, it can lead to a range of issues that affect the vehicle's performance and functionality.
Common Causes of U2139 GMC
- Faulty wiring connections
- Damaged wiring harnesses
- Malfunctioning CIM
- Malfunctioning ECM
- Corrosion on electrical connectors
Symptoms of U2139 GMC
- Non-responsive turn signals
- Inoperative windshield wipers
- Unable to engage cruise control
- Intermittent stalling
- Rough idling
How to Fix U2139 GMC
- Begin by conducting a thorough inspection of the wiring connections and harnesses between the ECM and CIM to check for any visible damage or corrosion.
- Test the CIM and ECM using a diagnostic scanner to identify any specific faults or malfunctions that may be causing the communication error.
- If necessary, replace any damaged wiring connections or harnesses, ensuring that all connections are secure and free of corrosion.
- Replace the CIM or ECM if they are found to be faulty, following manufacturer guidelines for installation and programming.
- Clear the diagnostic trouble codes from the vehicle's system and perform a test drive to ensure that the communication error has been resolved.
Cost to Fix U2139 GMC
The typical repair costs for addressing a U2139 GMC code can vary depending on the specific cause of the communication error and the extent of the repairs needed. In general, the cost of parts for this repair can range from $200 to $600, while labor costs can range from $100 to $300. However, it's important to note that these are rough estimates, and actual costs may vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. Additionally, diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It's recommended to consult with a professional mechanic for a more accurate cost estimate based on the specific circumstances of your vehicle.
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Frequently Asked Questions about U2139 GMC Code
1. What does the OBDII code U2139 mean on a GMC?
It indicates a loss of communication with the Column Integration Module (CIM), which is responsible for controlling various vehicle functions like lighting and wiper systems.
2. What are the common symptoms of code U2139 on a GMC?
Symptoms may include a non-functioning horn, inoperative wipers, malfunctioning turn signals, or intermittent communication issues with other modules.
3. What causes the U2139 code to appear on a GMC vehicle?
Common causes include faulty wiring or connectors, a failing Column Integration Module, or intermittent power supply issues to the module.
4. Can a weak battery cause the U2139 code on a GMC?
Yes, a weak or failing battery, or poor battery connections, can cause communication errors and trigger the U2139 code.
5. How do you diagnose the U2139 code on a GMC?
Use a scan tool to check for related codes and inspect the wiring, connectors, and power supply to the Column Integration Module.
6. Can I drive my GMC with a U2139 code active?
While the vehicle may still be drivable, important systems like wipers and turn signals may not work, which can compromise safety.
7. How do you fix the U2139 code on a GMC?
Repairs may include fixing damaged wiring, cleaning or reconnecting loose connectors, updating the CIM software, or replacing the Column Integration Module if necessary.
8. Is the U2139 code specific to GMC vehicles?
No, the U2139 code can appear on other GM vehicles, but it is specific to issues with the Column Integration Module in those models.
9. What tools are needed to troubleshoot the U2139 code on a GMC?
A professional-grade scan tool and a multimeter are essential for diagnosing communication and wiring issues.
10. Can software updates resolve the U2139 code on a GMC?
Yes, in some cases, updating the software for the Column Integration Module or other related modules can resolve the issue.
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