AutoCodes - Cadillac - U18A1 CADILLAC

U18A1 CADILLAC Code - Lost Communication With Coolant Temperature Control Module On High Voltage Energy Management CAN Bus

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|U18A1 CADILLAC code possible causes

  • Faulty Coolant Temperature Control Module
  • Coolant Temperature Control Module harness is open or shorted
  • Coolant Temperature Control Module circuit poor electrical connection

|How do I fix the U18A1 CADILLAC code?

Check 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.

|Cost of diagnosing the U18A1 CADILLAC code

Labor: 1.0

The cost of diagnosing the U18A1 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.

|What are U18A1 CADILLAC code possible symptoms?

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

|U18A1 CADILLAC code 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. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.
OBDII Code U18a1 Cadillac - Lost Communication With Coolant Temperature Control Module On High Voltage Energy Management CAN Bus -

|Need more information with the U18A1 CADILLAC code?

Need more information on how to fix the U18A1 CADILLAC code? Get Access to Factory Service Manuals

|Need help with a U18A1 CADILLAC code?

Get the U18a1 Cadillac code diagnosed by a professional: Find a repair shop in your area

|U18A1 CADILLAC code comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U18a1 Cadillac code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧
Repair Importance Level: 3
1=Low 2=Medium 3=High What is this?
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard What is this?