U135D GMC Code - Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2
Quick Answer
The U135D GMC code indicates that there is a communication problem between the Chassis Control Module (CCM) and the Transmission Control Module (TCM) on the LIN Bus 2 network. Common causes include Faulty Transmission Control Module (TCM), Malfunctioning Chassis Control Module (CCM), Wiring harness issues or loose connections. 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
- U135D GMC indicates Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2.
- Common causes
- Common causes include Faulty Transmission Control Module (TCM), Malfunctioning Chassis Control Module (CCM), Wiring harness issues or loose connections.
- 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 U135D GMC Description
The U135D GMC code indicates that there is a communication problem between the Chassis Control Module (CCM) and the Transmission Control Module (TCM) on the LIN Bus 2 network. The LIN Bus 2 is a communication network that allows various modules in the vehicle to exchange information. When the CCM loses communication with the TCM, it can lead to issues with the transmission control and overall vehicle performance.
Common Causes of U135D GMC
- Faulty Transmission Control Module (TCM)
- Malfunctioning Chassis Control Module (CCM)
- Wiring harness issues or loose connections
- Damaged LIN Bus network
- Software glitches or programming errors
Symptoms of U135D GMC
- Erratic shifting or difficulty changing gears
- Transmission slipping or hesitation
- Illuminated transmission warning light on the dashboard
- Loss of power or reduced fuel efficiency
- Inability to engage certain gears or drive modes
How to Fix U135D GMC
- Perform a diagnostic scan to retrieve the specific fault codes and pinpoint the communication issue between the CCM and TCM.
- Inspect the wiring harness for any damage, loose connections, or corrosion. Repair or replace as necessary.
- Test the TCM and CCM for proper functionality and communication. Replace any faulty modules.
- Check the LIN Bus network for any faults or damage. Repair or replace any damaged components.
- Clear the fault codes and perform a road test to ensure that the communication issue has been resolved.
Cost to Fix U135D GMC
The cost of repairing a communication issue between the CCM and TCM can vary depending on the exact cause of the problem and the extent of the repairs needed. In general, you can expect to pay anywhere from $200 to $800 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your specific vehicle make and model.
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Frequently Asked Questions about U135D GMC Code
What are common symptoms of OBDII code U135D GMC?
- Common symptoms include issues with shifting gears, transmission not engaging properly, and dashboard warning lights related to transmission or communication errors.
What are possible causes of OBDII code U135D GMC?
- Possible causes include faulty wiring or connectors, a malfunctioning transmission control module (TCM), a problem with the chassis control module (CCM), or issues with the LIN bus communication network.
How can I diagnose OBDII code U135D GMC?
- Diagnosis involves using a scan tool to retrieve the code, checking for any related codes, inspecting wiring and connectors for damage, testing the TCM and CCM for functionality, and ensuring proper communication on the LIN bus network.
How can I repair OBDII code U135D GMC?
- Repair may involve repairing or replacing damaged wiring or connectors, reprogramming the TCM or CCM, replacing the TCM or CCM if faulty, or addressing any issues with the LIN bus communication network.
Can I drive my vehicle with OBDII code U135D GMC?
- It is not recommended to drive the vehicle with this code present, as it can lead to potential transmission issues and safety concerns. It is best to address the problem promptly.
Is OBDII code U135D GMC a common issue in GMC vehicles?
- While it may not be as common as some other codes, issues related to lost communication with the transmission control module on the chassis control module LIN bus can occur in GMC vehicles, especially in older models.
Can a DIY enthusiast fix OBDII code U135D GMC at home?
- Depending on their skill level and access to tools and resources, a DIY enthusiast may be able to diagnose and repair this code at home. However, complex electrical issues may require professional assistance.
What should I do if OBDII code U135D GMC keeps coming back after repair?
- If the code keeps returning after repair, it indicates that the underlying issue has not been fully resolved. Recheck all connections, wiring, and components related to the TCM, CCM, and LIN bus network for any missed problems.
Should I clear the OBDII code U135D GMC after fixing the issue?
- Yes, it is recommended to clear the code after fixing the underlying problem. This will reset the system and allow you to monitor if the issue reoccurs.
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