AutoCodes – Generic – U2135

U2135 Code - Lost Communication With Rear Integration Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Integration Module (RIM), Rear Integration Module harness is open or shorted, Rear Integration 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: U2135 indicates Lost Communication With Rear Integration Module.
Common causes: Common causes include Faulty Rear Integration Module (RIM), Rear Integration Module harness is open or shorted, Rear Integration 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 1,016

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 Jun 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2135 Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices 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 device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. A loss of serial data communications Diagnostic Trouble Code (DTC) does not represent a failure of the devices that contain the stored code. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U2135 - Lost Communication With Rear Integration Module - AutoCodes.com — U2135 Code - Lost Communication With Rear Integration Module

What does this mean?

What are the Possible Causes of the DTC U2135?

Faulty Rear Integration Module (RIM)
Rear Integration Module harness is open or shorted
Rear Integration Module circuit poor electrical connection

How to Fix the DTC U2135?

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 U2135 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 U2135 code?

Need more information on how to fix the U2135 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U2135 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U2135 Buick — Lost Communication With Rear Integration Module
U2135 Cadillac — Lost Communication With Rear Integration Module
U2135 Chevrolet — Lost Communication With Rear Integration Module
U2135 GMC — Lost Communication With Rear Integration Module

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 U2135 Code

1. What are the common symptoms of OBDII code U2135 (Lost Communication With Rear Integration Module)?

- Common symptoms include non-functioning rear lights, issues with the rear windshield wiper, malfunctioning rear parking sensors, and central locking problems.

2. What are the possible causes of OBDII code U2135?

- The code U2135 can be caused by wiring issues, a faulty rear integration module, damaged connectors, or a malfunction in the communication network.

3. How can I diagnose OBDII code U2135?

- To diagnose U2135, you can use a diagnostic scan tool to retrieve the code, inspect the wiring and connectors related to the rear integration module, and perform a thorough visual inspection for any visible damage.

4. What are some repair tips for fixing OBDII code U2135?

- Repair tips include checking and repairing any damaged wiring or connectors, replacing the rear integration module if necessary, and ensuring all connections are secure and properly seated.

5. Can I drive my vehicle with OBDII code U2135?

- It is generally not recommended to drive your vehicle with U2135 as it can affect the proper functioning of critical safety systems in the rear of the vehicle.

6. How much does it typically cost to repair OBDII code U2135?

- The cost of repairing U2135 can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

7. Is it possible to reset OBDII code U2135 without fixing the underlying issue?

- While you can clear the code with a diagnostic tool, it is important to address the root cause of U2135 to prevent the issue from recurring and ensure the proper functioning of your vehicle.

8. Can a DIY enthusiast fix OBDII code U2135 at home?

- Depending on your skill level and access to tools, you may be able to diagnose and repair U2135 at home by following repair guides and using appropriate safety precautions.

9. Will OBDII code U2135 cause my vehicle to fail an emissions test?

- If left unresolved, U2135 can potentially affect the emissions control systems of your vehicle, leading to a failed emissions test in regions where OBDII diagnostics are required.

10. How long does it typically take to repair OBDII code U2135?

- The repair time for U2135 can vary based on the complexity of the issue and the availability of parts, but it may take anywhere from a couple of hours to a full day at a repair shop.