AutoCodes – Cadillac – U2135 Cadillac

U2135 Cadillac 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 Cadillac 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 858

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

What does this mean?

What are the Possible Causes of the DTC U2135 Cadillac?

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 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 U2135 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 U2135 Cadillac Code

1. What are the common symptoms of OBDII code U2135 in a Cadillac indicating lost communication with the rear integration module?

- Common symptoms include malfunctioning rear lights, power window issues, and problems with the rear entertainment system.

2. What are the potential causes of OBDII code U2135 in a Cadillac?

- Possible causes include a faulty rear integration module, damaged wiring or connectors, software glitches, or a problem with the vehicle's network communication system.

3. How can I diagnose the issue related to OBDII code U2135 in my Cadillac?

- Diagnose the problem by conducting a thorough inspection of the rear integration module, checking the wiring and connectors for any damage, and using a diagnostic scanner to read trouble codes and data.

4. Can I repair the lost communication with the rear integration module issue in my Cadillac myself?

- Depending on the cause, you may be able to repair the issue yourself by replacing a faulty rear integration module, repairing damaged wiring, or reprogramming the module if needed.

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

- It's not recommended to drive the vehicle with this code present, as it can lead to further electrical issues and potential safety hazards due to malfunctioning rear systems.

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

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a couple of hundred dollars for basic repairs to over a thousand dollars for more complex issues.

7. Are there any preventative measures I can take to avoid OBDII code U2135 in my Cadillac?

- Regular maintenance and inspections, checking the vehicle's electrical system, and addressing any warning signs promptly can help prevent issues leading to this code.

8. Can a low battery voltage trigger OBDII code U2135 in a Cadillac?

- Yes, low battery voltage or electrical system issues can sometimes lead to communication errors with the rear integration module, triggering this code.

9. Will resetting the trouble codes make OBDII code U2135 go away permanently in a Cadillac?

- Resetting the codes may temporarily clear the error, but if the underlying issue causing the lost communication with the rear integration module is not addressed, the code is likely to return.

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

- The repair time can vary depending on the cause and complexity of the issue, but it may take anywhere from a few hours to a full day at a repair shop.