AutoCodes – Cadillac – U135E Cadillac

U135E Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

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

Code Popularity 452

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
Add Comment

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

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

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 Cadillac?

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 Cadillac 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 U135E Cadillac code?

Need more information on how to fix the U135E Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U135E Cadillac code diagnosed by a professional: Find a repair shop in your area

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 Cadillac Code

1. What are the common symptoms of OBDII code U135E in a Cadillac?

The common symptoms include issues with shifting gears, transmission slipping, poor fuel efficiency, and the vehicle going into limp mode.

2. What are some potential causes of the U135E code in a Cadillac?

Potential causes of the U135E code include faulty wiring or connectors, a malfunctioning transmission control module (TCM), a defective engine control module (ECM), or communication errors on the LIN bus.

3. How can I diagnose the U135E code on my Cadillac?

Diagnosing the U135E code typically involves using a professional OBDII scanner to read the code, checking for any additional related codes, inspecting the wiring and connectors for damage, and testing the communication between the TCM and ECM.

4. Can I still drive my Cadillac with the U135E code present?

It is not recommended to drive your Cadillac with the U135E code present, as it can lead to transmission issues and potential safety hazards. It is best to address the problem promptly.

5. How can I repair the U135E code on my Cadillac?

Repairing the U135E code may involve repairing or replacing damaged wiring or connectors, resetting the TCM and ECM, or replacing the TCM or ECM if they are found to be faulty.

6. Is it possible to clear the U135E code on my Cadillac without fixing the underlying issue?

Clearing the code without addressing the underlying issue may temporarily remove the warning light, but the problem will likely resurface. It is important to diagnose and repair the root cause of the code.

7. Can a DIY enthusiast fix the U135E code on a Cadillac?

While some aspects of diagnosing and repairing the U135E code may be possible for a skilled DIY enthusiast, it is recommended to seek professional help for accurate diagnosis and proper repair to avoid further damage.

8. How much does it cost to repair the U135E code on a Cadillac?

The cost of repairing the U135E code on a Cadillac can vary depending on the underlying issue, the need for parts replacement, and labor costs. It is advisable to get quotes from trusted mechanics or dealerships.

9. Are there any preventive measures to avoid the U135E code in a Cadillac?

Regular maintenance, such as checking and cleaning connectors, ensuring proper wiring integrity, and timely addressing any transmission issues, can help prevent the occurrence of the U135E code in a Cadillac.

10. Will the U135E code cause permanent damage to my Cadillac if left unresolved?

Continuing to drive with the U135E code can potentially lead to further damage to the transmission or other related components. It is best to address the issue promptly to prevent costly repairs in the future.