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Engine-Codes – Generic – U135E

U135E Code - Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1

Quick Answer

The U135E diagnostic trouble code indicates that there is a communication failure between the Engine Control Module (ECM) and the Transmission Control Module (TCM) on the LIN Bus 1 network. Common causes include Faulty ECM or TCM, Damaged wiring or connectors in the LIN Bus network, Software glitch in the ECM or TCM. 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
U135E indicates Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1.
Common causes
Common causes include Faulty ECM or TCM, Damaged wiring or connectors in the LIN Bus network, Software glitch in the ECM or TCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code U135E Description

The U135E diagnostic trouble code indicates that there is a communication failure between the Engine Control Module (ECM) and the Transmission Control Module (TCM) on the LIN Bus 1 network. The LIN Bus (Local Interconnect Network) is a form of serial communication used in modern vehicles to transmit data between various modules and sensors. In this case, the ECM and TCM are unable to exchange essential information, which can lead to performance issues and potentially cause the vehicle to malfunction.

OBDII Code U135E - Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1
U135E Code - Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1

Common Causes of U135E

  1. Faulty ECM or TCM
  2. Damaged wiring or connectors in the LIN Bus network
  3. Software glitch in the ECM or TCM
  4. Weak battery or alternator affecting communication

Symptoms of U135E

  1. Erratic shifting or difficulty changing gears
  2. Loss of power or acceleration
  3. Rough idling or stalling
  4. Check engine light illuminated
  5. Decreased fuel efficiency

How to Fix U135E

  1. Perform a thorough inspection of the LIN Bus network, including checking for damaged wiring or connectors.
  2. Use a diagnostic scan tool to communicate with the ECM and TCM to identify any specific communication errors.
  3. Test the ECM and TCM for proper functionality and replace if necessary.
  4. Clear the diagnostic trouble codes and reset the system to see if the issue reoccurs.
  5. Test drive the vehicle to ensure proper transmission operation after repairs.

Cost to Fix U135E

The typical repair costs for addressing a U135E code can vary depending on the specific cause of the communication failure. In general, the parts and labor involved in diagnosing and repairing this issue can range from $200 to $800. However, it is essential to note that the actual cost may be higher or lower based on the location, vehicle make and model, and the rates charged by auto repair shops. It is advisable to consult with a professional technician to obtain a more accurate estimate for this repair.

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Code U135E Information for Specific Makes

  • U135E Buick — Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1
  • U135E Cadillac — Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1
  • U135E Chevrolet — Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1
  • U135E GMC — Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1
About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U135E Code

1. What are common symptoms of OBDII code U135E?

- Common symptoms include transmission shifting issues, engine stalling, and the illumination of the check engine light.

2. What are possible causes of code U135E?

- Possible causes include a faulty transmission control module (TCM), issues with the Engine Control Module (ECM), damaged wiring or connectors, or a communication network failure.

3. How can I diagnose OBDII code U135E?

- Diagnosis typically involves using a scan tool to retrieve the code, checking for other related codes, inspecting wiring and connectors, and testing the communication network between the TCM and ECM.

4. Can I drive my vehicle with code U135E?

- It is not recommended to drive your vehicle with this code present, as it can lead to serious transmission and engine performance issues.

5. How can I repair OBDII code U135E?

- Repair options may include repairing or replacing damaged wiring or connectors, resetting the codes, reprogramming modules, or replacing the TCM or ECM if necessary.

6. Is it safe to reset the code U135E on my own?

- While you can attempt to reset the code on your own, it is important to address the underlying issue causing the code to prevent further damage to your vehicle.

7. Can a low battery voltage trigger code U135E?

- Yes, low battery voltage or electrical issues can sometimes trigger communication errors between the TCM and ECM, leading to code U135E.

8. How much does it typically cost to repair OBDII code U135E?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a simple wiring repair to a more complex module replacement, potentially costing a few hundred to over a thousand dollars.

9. Are there any DIY tips for addressing code U135E?

- DIY tips may include checking and tightening connectors, ensuring proper battery voltage, and inspecting for visible wiring damage before seeking professional help.

10. How long does it take to repair code U135E?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take anywhere from a few hours to a full day at a repair shop.

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