AutoCodes – GMC – U135D GMC

U135D GMC Code - Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2

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: 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, 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 526

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 U135D 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 U135D GMC - Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2 - AutoCodes.com — U135D GMC Code - Lost Communication With Transmission Control Module On Chassis Control Module LIN Bus 2

What does this mean?

What are the Possible Causes of the DTC U135D 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 U135D 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 U135D 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 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.