Engine-Codes - Cadillac - U1066 CADILLAC

U1066 CADILLAC - Loss Of Communication With Rear Integrated Module

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

U1066 CADILLAC Possible Causes

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

How is the U1066 CADILLAC code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the U1066 CADILLAC code

Labor: 1.0

The cost to diagnose the U1066 CADILLAC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
How much do you know about cars?

Take the AutoCodes.com automotive tests and turbo-charge your car repair knowledge

Play Now

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

U1066 CADILLAC Meaning

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.

More Information

Need more information on how to fix the U1066 CADILLAC code?
Get Access to Factory Service Manuals

Need more help?

Get the U1066 Cadillac code diagnosed by a professional: Find a repair shop in your area