U135D Code - Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2
Quick Answer
The U135D diagnostic trouble code (DTC) indicates that there is a communication problem between the Chassis Control Module (CCM) and the Transmission Control Module (TCM) on LIN Bus 2. Common causes include Faulty wiring or connectors in the LIN Bus 2 network, Malfunctioning Chassis Control Module, Malfunctioning Transmission Control Module. 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 indicates Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2.
- Common causes
- Common causes include Faulty wiring or connectors in the LIN Bus 2 network, Malfunctioning Chassis Control Module, Malfunctioning Transmission Control Module.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code U135D Description
The U135D diagnostic trouble code (DTC) indicates that there is a communication problem between the Chassis Control Module (CCM) and the Transmission Control Module (TCM) on LIN Bus 2. This communication issue can affect the vehicle's performance and overall functionality. The LIN Bus 2 is a communication network within the vehicle that allows various modules to exchange data and information.
Common Causes of U135D
- Faulty wiring or connectors in the LIN Bus 2 network
- Malfunctioning Chassis Control Module
- Malfunctioning Transmission Control Module
- Software issues within the modules
- Physical damage to the modules or connectors
Symptoms of U135D
- Erratic shifting of gears
- Delayed or harsh transmission shifts
- Transmission slipping
- Illuminated Check Engine Light
- Loss of power or acceleration
How to Fix U135D
- Perform a thorough diagnostic scan to confirm the U135D code and pinpoint the exact cause of the communication failure.
- Inspect the wiring and connectors in the LIN Bus 2 network for any damage or corrosion. Repair or replace as needed.
- Check the Chassis Control Module and Transmission Control Module for any signs of malfunction. Replace the faulty module if necessary.
- Update the software in the modules to the latest version to address any potential software glitches.
- Clear the DTC and test drive the vehicle to ensure the communication between the CCM and TCM has been restored.
Cost to Fix U135D
The typical repair costs for addressing the U135D code can vary depending on the specific cause of the communication failure and the extent of the repairs needed. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it's important to note that the diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may differ in metropolitan areas or at dealerships. It's advisable to check with local shops for a more accurate estimate of the repair costs.
Need more information about the U135D code?
Need more information on how to fix the U135D code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U135D code diagnosed by a professional: Find a repair shop in your area
Code U135D Information for Specific Makes
- U135D Buick — Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2
- U135D Cadillac — Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2
- U135D Chevrolet — Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2
- U135D GMC — Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2
Frequently Asked Questions about U135D Code
What does the OBDII code U135D mean?
The U135D code indicates a loss of communication between the Transmission Control Module (TCM) and the Chassis Control Module (CCM) over the LIN Bus 2 network.
What are the common symptoms of the U135D code?
Symptoms may include a malfunctioning transmission, erratic shifting, the vehicle going into limp mode, or the illumination of the check engine light.
What causes the U135D code to appear?
Possible causes include damaged wiring or connectors in the LIN Bus 2 circuit, a failed Transmission Control Module, a faulty Chassis Control Module, or software glitches.
Can I drive my vehicle with the U135D code present?
Driving with this code is not recommended, as it may cause erratic transmission behavior or the vehicle to enter limp mode, potentially leading to unsafe driving conditions.
How do I diagnose the U135D code?
Start by inspecting the LIN Bus 2 wiring and connectors for damage or corrosion. Then check for proper voltage and ground at the modules and verify communication with a scan tool.
What tools are needed to troubleshoot the U135D code?
A diagnostic scan tool capable of reading LIN Bus communication, a multimeter for testing circuits, and wiring diagrams for the vehicle are essential tools.
How is the U135D code fixed?
Repairs may include repairing or replacing damaged wiring, cleaning or replacing corroded connectors, reprogramming or updating the affected modules, or replacing a faulty module.
Can a weak battery cause the U135D code?
Yes, a weak or failing battery can cause communication faults on the LIN Bus network, leading to the U135D code.
What does LIN Bus 2 mean in the context of U135D?
LIN Bus 2 refers to a specific Local Interconnect Network (LIN) communication line that allows the TCM and CCM to exchange data.
How much does it cost to repair the U135D code?
Costs can vary widely depending on the issue. Simple wiring repairs may cost $100–$300, while module replacements or reprogramming can range from $500 to $1,500 or more.
Discuss the causes and fixes for U135D OBDII Code
Code U135D comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.