AutoCodes – GMC – U2135 GMC

U2135 GMC 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 GMC 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 602

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

What does this mean?

What are the Possible Causes of the DTC U2135 GMC?

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 GMC?

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 GMC 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 U2135 GMC Code

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

- Common symptoms include malfunctioning rear lights, issues with power windows or locks, and dashboard warning lights related to the rear integration module.

2. What are some possible causes of code U2135 GMC?

- Possible causes include a faulty rear integration module, damaged wiring or connectors, software issues, or a loss of power or ground to the module.

3. How can I diagnose the cause of code U2135 GMC?

- Diagnosis typically involves checking the rear integration module for power and ground, inspecting wiring and connectors for damage, and using a diagnostic scanner to communicate with the module.

4. Can a DIY enthusiast repair code U2135 GMC at home?

- Depending on the cause, DIY repairs may be possible, such as checking and repairing wiring connections or replacing the rear integration module if necessary. However, complex electrical diagnostics may require professional help.

5. Is it safe to continue driving with OBDII code U2135 GMC present?

- It is generally not recommended to continue driving with this code active, as it may affect critical functions like lighting or power accessories controlled by the rear integration module.

6. What are some tips for preventing OBDII code U2135 GMC from recurring?

- Regularly inspecting and maintaining the electrical components related to the rear integration module, such as checking for corrosion or loose connections, can help prevent this code from recurring.

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

- Repair costs can vary depending on the cause of the code and whether professional diagnostic services are needed. It's best to consult with a mechanic for an accurate estimate.

8. Can a disconnected battery reset code U2135 GMC?

- Disconnecting the battery may reset the code temporarily, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven again.

9. Will clearing the code with a diagnostic tool fix the problem permanently?

- Clearing the code may temporarily remove the warning light, but if the root cause is not fixed, the code is likely to return and potentially lead to recurring issues with the rear integration module.

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

- Repair times can vary depending on the complexity of the issue and the availability of parts. Simple repairs like reconnecting loose wiring may take a short time, while more involved repairs can take several hours or more.