AutoCodes – Buick – U2135 Buick

U2135 Buick 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 Buick 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 575

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

What does this mean?

What are the Possible Causes of the DTC U2135 Buick?

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 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 U2135 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 U2135 Buick Code

1. What does the OBDII code U2135 mean on a Buick?

U2135 indicates a loss of communication between the vehicle's main control modules and the Rear Integration Module (RIM).

2. What are the common symptoms of the U2135 code?

Symptoms may include non-functional rear electrical components, such as rear lights or audio controls, and possible warning lights on the dashboard.

3. What causes the U2135 code to appear on a Buick?

Causes can include faulty wiring or connectors, a failing Rear Integration Module, or a problem with the vehicleâ€™s CAN (Controller Area Network) communication system.

4. How do I diagnose a U2135 communication issue?

Start by checking for loose or corroded wiring and connectors related to the Rear Integration Module. Use a scan tool to confirm communication loss and test the module's functionality.

5. Can a weak battery cause the U2135 code?

Yes, a weak or failing battery can cause voltage fluctuations that disrupt communication between modules and trigger the U2135 code.

6. Where is the Rear Integration Module (RIM) located in a Buick?

The RIM is typically located in the rear of the vehicle, often near the trunk or rear fuse box. Check your vehicleâ€™s service manual for the exact location.

7. Can I drive my Buick with the U2135 code active?

While the vehicle may still be drivable, non-functional rear components like lights or sensors could pose safety risks, so itâ€™s best to address the issue promptly.

8. How do I fix the U2135 code on a Buick?

Repairs may involve fixing damaged wiring, cleaning corroded connectors, reprogramming the RIM, or replacing the module if it has failed.

9. What tools are needed to troubleshoot the U2135 code?

Youâ€™ll need an OBDII scanner with advanced diagnostic capabilities, a multimeter for testing electrical connections, and potentially the vehicleâ€™s wiring diagram.

10. Is it expensive to repair a U2135 code on a Buick?

Repair costs can vary depending on the cause. Simple fixes like cleaning connectors may be inexpensive, but replacing the RIM or repairing wiring could be more costly.