AutoCodes – Cadillac – U0136 Cadillac

U0136 Cadillac Code - Lost Communication With Rear Differential Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Differential Control Module, Rear Differential Control Module harness is open or shorted, Rear Differential 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: U0136 Cadillac indicates Lost Communication With Rear Differential Control Module.
Common causes: Common causes include Faulty Rear Differential Control Module, Rear Differential Control Module harness is open or shorted, Rear Differential 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 1,330

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 Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0136 Cadillac Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Rear Differential Control Module has not been received.

OBDII Code U0136 Cadillac - Lost Communication With Rear Differential Control Module - AutoCodes.com — U0136 Cadillac Code - Lost Communication With Rear Differential Control Module

What does this mean?

What are the Possible Causes of the DTC U0136 Cadillac?

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

How to Fix the DTC U0136 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 U0136 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.

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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 U0136 Cadillac Code

1. What are the common symptoms of OBDII code U0136 (Lost Communication With Rear Differential Control Module) in a Cadillac?

- Common symptoms include an illuminated check engine light, issues with the stability control system, ABS warning lights, and potential problems with the rear differential.

2. What are some possible causes of the U0136 trouble code in a Cadillac?

- Possible causes include a faulty rear differential control module, damaged wiring or connectors, communication bus issues, or a malfunctioning powertrain control module.

3. How can I diagnose the U0136 code related to the rear differential control module in my Cadillac?

- Diagnosing the U0136 code typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connectors for damage, and testing the rear differential control module for proper operation.

4. Can I still drive my Cadillac with the U0136 trouble code present?

- It is generally not recommended to drive your Cadillac with the U0136 code active, as it can affect the performance and safety systems of the vehicle. It's best to address the issue promptly.

5. How can I repair the U0136 code related to lost communication with the rear differential control module in my Cadillac?

- Repairing the U0136 code may involve repairing or replacing damaged wiring or connectors, resetting the control modules, or replacing the rear differential control module if necessary.

6. Are there any specific maintenance tips to prevent the U0136 trouble code from recurring in my Cadillac?

- To prevent the U0136 code from recurring, it's essential to regularly inspect the wiring and connectors related to the rear differential control module and perform routine maintenance checks on the vehicle's electrical system.

7. Can a DIY enthusiast fix the U0136 trouble code issue in a Cadillac, or is professional assistance necessary?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the U0136 code related to the rear differential control module may require specialized tools and expertise, making professional assistance advisable.

8. Will the U0136 code clear on its own, or does it need to be manually reset after repairs?

- In most cases, the U0136 trouble code will need to be manually cleared using an OBDII scanner after the underlying issue with the rear differential control module has been resolved.

9. How long does it typically take to repair the U0136 trouble code in a Cadillac?

- The repair time for the U0136 code can vary depending on the exact cause of the issue. Simple fixes like resetting the control modules may take a short time, while complex repairs involving module replacement could take longer.

10. Does the U0136 trouble code in a Cadillac affect the vehicle's overall performance or safety?

- Yes, the U0136 code can impact the performance and safety systems of the Cadillac, particularly related to stability control, ABS functions, and the proper operation of the rear differential. It's important to address this issue promptly.