AutoCodes – GMC – U135E GMC

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

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Transmission Control Module, Transmission Control Module harness is open or shorted, Transmission 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: U135E GMC indicates Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1.
Common causes: Common causes include Faulty Transmission Control Module, Transmission Control Module harness is open or shorted, Transmission 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.

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Code Popularity 1,582

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U135E GMC Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U135E GMC - Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1 - AutoCodes.com — U135E GMC Code - Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1

What does this mean?

What are the Possible Causes of the DTC U135E GMC?

Faulty Transmission Control Module
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U135E GMC?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U135E GMC 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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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 GMC Code

1. What are common symptoms of OBDII code U135E GMC?

- Common symptoms include the transmission not shifting properly, the vehicle going into limp mode, and the check engine light being illuminated.

2. What can cause the U135E GMC code to appear?

- The code U135E GMC is triggered when the Engine Control Module (ECM) loses communication with the Transmission Control Module (TCM) over the LIN Bus 1 network.

3. How can I diagnose the U135E GMC code?

- Diagnosis typically involves checking the wiring and connections between the ECM and TCM, inspecting for damaged wires or loose connections, and using a diagnostic scanner to retrieve and clear the code.

4. What are some possible repair tips for resolving U135E GMC?

- Repair tips include checking and repairing any damaged wiring, ensuring all connectors are securely plugged in, and resetting the code to see if it reoccurs after repairs.

5. Can a DIYer fix the U135E GMC code?

- Depending on the root cause, some DIYers may be able to fix the issue by checking and repairing wiring connections. However, for more complex issues, it is recommended to seek professional help.

6. Will driving with the U135E GMC code harm my vehicle?

- Driving with the U135E GMC code may cause performance issues and potential damage to the transmission if left unresolved. It is best to address the issue promptly.

7. How do I prevent the U135E GMC code from reappearing?

- To prevent the code from reappearing, make sure all wiring connections are secure, perform regular maintenance checks, and address any transmission issues promptly.

8. Can the U135E GMC code be a false alarm?

- While rare, the U135E GMC code can sometimes be triggered by a temporary communication glitch. Clearing the code and monitoring the situation can help determine if it was a false alarm.

9. What are the risks of ignoring the U135E GMC code?

- Ignoring the U135E GMC code can lead to transmission problems, reduced fuel efficiency, and potential safety issues on the road. It is important to address the underlying issue promptly.

10. How much does it typically cost to repair the U135E GMC code?

- The cost of repairing the U135E GMC code can vary depending on the root cause of the issue, the extent of repairs needed, and whether professional help is required. It is recommended to obtain quotes from trusted auto repair shops.