AutoCodes – Buick – U135E Buick

U135E Buick 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 Buick 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 636

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 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U135E Buick 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 Buick - Lost Communication With Transmission Control Module On Engine Control Module LIN Bus 1 - AutoCodes.com — U135E Buick 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 Buick?

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 Buick?

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 Buick 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 Buick Code

1. What are common symptoms of OBDII code U135E in a Buick indicating lost communication with the Transmission Control Module (TCM) on the Engine Control Module (ECM) LIN Bus 1?

- Common symptoms include erratic shifting, transmission slipping, and illumination of the "Check Engine" light.

2. What are some possible causes of OBDII code U135E in a Buick?

- Possible causes include damaged wiring or connectors between the TCM and ECM, a faulty TCM, a malfunctioning ECM, or a communication network issue.

3. How can I diagnose the source of the problem related to OBDII code U135E in my Buick?

- Diagnose by checking the wiring and connectors for damage, testing the TCM and ECM for functionality, and performing a thorough inspection of the LIN Bus communication network.

4. Can I drive my Buick with OBDII code U135E present?

- It is not recommended to drive your Buick with this code present as it can lead to transmission issues and potential safety hazards.

5. How can I repair OBDII code U135E in my Buick?

- Repair options include fixing damaged wiring or connectors, replacing a faulty TCM or ECM, and addressing any communication network issues.

6. Is it necessary to reset the OBDII code U135E after repairing the issue in my Buick?

- Yes, it is recommended to clear the code using an OBDII scanner after resolving the underlying problem to reset the system and ensure proper functionality.

7. Can a DIY enthusiast fix OBDII code U135E in a Buick, or is professional help required?

- Depending on the skill level and experience, some DIY enthusiasts may be able to address the issue, but professional help is recommended for complex electrical and transmission-related problems.

8. How much does it typically cost to repair OBDII code U135E in a Buick at a dealership or auto repair shop?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay for diagnostic testing, parts replacement, and labor, which can range from a few hundred to over a thousand dollars.

9. Is there any preventive maintenance to avoid encountering OBDII code U135E in a Buick?

- Regularly inspecting and maintaining the wiring and connectors in the TCM and ECM system, as well as ensuring the communication network is functioning properly, can help prevent issues leading to this code.

10. What should I do if OBDII code U135E keeps recurring in my Buick even after repairs?

- If the code keeps coming back, it may indicate an unresolved issue or a deeper underlying problem. In this case, it is best to seek professional help to diagnose and address the persistent issue.