AutoCodes – Chevrolet – U1066 Chevrolet

U1066 Chevrolet Code - Loss Of Communication With Rear Integrated Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Integrated Module (RIM), Rear Integrated Module harness is open or shorted, Rear Integrated 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: U1066 Chevrolet indicates Loss Of Communication With Rear Integrated Module.
Common causes: Common causes include Faulty Rear Integrated Module (RIM), Rear Integrated Module harness is open or shorted, Rear Integrated 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 751

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 Apr 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1066 Chevrolet Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1066 is set.

OBDII Code U1066 Chevrolet - Loss Of Communication With Rear Integrated Module - AutoCodes.com — U1066 Chevrolet Code - Loss Of Communication With Rear Integrated Module

What does this mean?

What are the Possible Causes of the DTC U1066 Chevrolet?

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

How to Fix the DTC U1066 Chevrolet?

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 U1066 Chevrolet 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 U1066 Chevrolet Code

1. What are the common symptoms of OBDII code U1066 in a Chevrolet related to loss of communication with the Rear Integrated Module?

- Common symptoms include non-functioning rear lights, issues with the rear wiper, failure of rear climate control, and malfunctioning power door locks.

2. What are some possible causes of the U1066 code in a Chevrolet indicating a loss of communication with the Rear Integrated Module?

- Potential causes include a faulty Rear Integrated Module, damaged wiring or connectors, a blown fuse, or issues with the vehicle's network communication system.

3. How can I diagnose the U1066 code in a Chevrolet when experiencing a loss of communication with the Rear Integrated Module?

- Diagnose the code by checking the rear module's connections, inspecting wiring for damage, verifying fuse integrity, and using a scan tool to communicate with the module.

4. Are there any simple repair tips to address the U1066 code in a Chevrolet due to loss of communication with the Rear Integrated Module?

- Begin by checking and repairing any damaged wiring or connectors, ensuring proper power supply to the module, and resetting the system by disconnecting the battery for a few minutes.

5. Can a DIY enthusiast fix the U1066 code in a Chevrolet related to loss of communication with the Rear Integrated Module?

- While basic checks like inspecting wiring and connections can be done by DIY enthusiasts, advanced diagnostics and repairs may require professional help to ensure proper resolution.

6. How important is it to address the U1066 code in a Chevrolet indicating loss of communication with the Rear Integrated Module?

- It is crucial to address this code promptly as it can affect various rear vehicle functions, compromising safety, convenience, and overall vehicle performance.

7. Will driving my Chevrolet with the U1066 code unresolved cause any further damage?

- Continuing to drive with the U1066 code and loss of communication with the Rear Integrated Module may lead to additional electrical issues and potential failure of rear systems.

8. What is the typical cost to repair the U1066 code in a Chevrolet due to loss of communication with the Rear Integrated Module?

- Repair costs can vary depending on the exact cause, but they typically range from $200 to $500, including parts and labor, if professional assistance is needed.

9. Can extreme weather conditions or environmental factors trigger the U1066 code in a Chevrolet related to the Rear Integrated Module?

- Yes, extreme temperatures, moisture, or other environmental factors can potentially damage wiring or connectors, leading to communication issues with the Rear Integrated Module.

10. Is it possible for the U1066 code to reappear after repair in a Chevrolet experiencing loss of communication with the Rear Integrated Module?

- If the root cause of the communication loss is not properly addressed during repair, the U1066 code may reappear, highlighting the importance of thorough diagnostics and repairs.