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U2135 GMC Code - Lost Communication With Rear Integration Module

Quick Answer

The U2135 GMC diagnostic trouble code indicates that there is a communication problem between the vehicle's onboard computer system and the Rear Integration Module (RIM). Common causes include Faulty wiring or connectors, Corrosion in the electrical connections, Malfunctioning Rear Integration Module (RIM). 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 wiring or connectors, Corrosion in the electrical connections, Malfunctioning Rear Integration Module (RIM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code U2135 GMC Description

The U2135 GMC diagnostic trouble code indicates that there is a communication problem between the vehicle's onboard computer system and the Rear Integration Module (RIM). The RIM is responsible for controlling various functions related to the rear of the vehicle, such as rear lights, power windows, and door locks. When communication is lost with the RIM, it can lead to a range of issues affecting the vehicle's performance and functionality.

OBDII Code U2135 GMC - Lost Communication With Rear Integration Module
U2135 GMC Code - Lost Communication With Rear Integration Module

Common Causes of U2135 GMC

  1. Faulty wiring or connectors
  2. Corrosion in the electrical connections
  3. Malfunctioning Rear Integration Module (RIM)
  4. Software issues in the vehicle's computer system
  5. Physical damage to the wiring harness

Symptoms of U2135 GMC

  1. Rear lights not working properly
  2. Power windows malfunctioning
  3. Door locks not responding
  4. Dashboard warning light illuminated
  5. Intermittent issues with rear systems

How to Fix U2135 GMC

  1. Perform a thorough inspection of the wiring harness and connectors for any signs of damage or corrosion.
  2. Check the communication lines between the vehicle's computer system and the RIM for continuity and proper connection.
  3. Test the RIM for functionality and replace if necessary.
  4. Clear the diagnostic trouble codes from the vehicle's computer system and perform a relearn procedure if needed.
  5. Verify the proper operation of the rear lights, power windows, and door locks after the repair is completed.

Cost to Fix U2135 GMC

The typical repair costs for addressing a U2135 GMC code can vary depending on the specific cause of the issue. In general, the cost of parts such as a new RIM or wiring harness can range from $200 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour. Additional diagnostic time may be required to pinpoint the exact cause of the communication problem. It is advisable to consult with a qualified mechanic to get an accurate estimate based on the vehicle's make and model, as well as the extent of the repair needed.

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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.

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