AutoCodes – Generic – U135D

U135D 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 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,031

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

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?

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 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.

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

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

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 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 $100â€“$300, while module replacements or reprogramming can range from $500 to $1,500 or more.