U1066 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 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.
Code U1066 Description
What are the Possible Causes of the DTC U1066?
- 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?
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 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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Information for Specific Makes
- U1066 Buick — Loss Of Communication With Rear Integrated Module
- U1066 Cadillac — Loss Of Communication With Rear Integrated Module
- U1066 Chevrolet — Loss Of Communication With Rear Integrated Module
- U1066 GMC — Loss Of Communication With Rear Integrated Module
Frequently Asked Questions about U1066 Code
1. What does the OBDII code U1066 mean?
U1066 indicates a loss of communication between the vehicle's main control module and the Rear Integrated Module (RIM), which manages various rear-end functions.
2. What are the common symptoms of a U1066 code?
Symptoms may include inoperative rear lights, power windows, or other rear-end electrical components, along with the illumination of the check engine light or other warning lights.
3. What causes the U1066 code to appear?
The code can be triggered by wiring issues, a faulty Rear Integrated Module (RIM), damaged connectors, or a failing main control module.
4. Can a bad battery cause the U1066 code?
Yes, a weak or failing battery can cause voltage irregularities, leading to communication faults like U1066.
5. How do you diagnose the U1066 code?
Diagnosis involves checking the wiring and connectors between the RIM and control module, testing the RIM for faults, and ensuring proper voltage supply.
6. Can the U1066 code be cleared without repairs?
Clearing the code without addressing the underlying issue may cause it to return. Repairs or corrections are typically needed to resolve the problem.
7. Is it safe to drive with the U1066 code?
Driving may still be possible, but safety features like brake lights or rear signals may be affected, so it’s best to address the issue promptly.
8. How much does it cost to fix a U1066 code?
Repair costs can vary widely depending on the issue, ranging from $50 for a simple wiring fix to over $500 if the RIM or control module needs replacement.
9. Can a software update fix the U1066 code?
In some cases, a software update for the vehicle’s control module may resolve compatibility or communication issues causing the U1066 code.
10. What tools are needed to troubleshoot the U1066 code?
A professional-grade OBDII scanner, a multimeter for electrical testing, and wiring diagrams for the affected vehicle are commonly used tools.
Discuss the causes and fixes for U1066 OBDII Code
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