Engine-Codes - Generic - U18C1

U18C1 - Lost Communication With Suspension Control Module On Chassis Expansion CAN Bus

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

U18C1 Possible Causes

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

How is the U18C1 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 U18C1 code

Labor: 1.0

The cost to diagnose the U18C1 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)

U18C1 Meaning

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.

More Information

Need more information on how to fix the U18C1 code?
Get Access to Factory Service Manuals

Information for specific makes

  • U18C1 BUICK Lost Communication With Suspension Control Module On Chassis Expansion CAN Bus
  • U18C1 CADILLAC Lost Communication With Suspension Control Module On Chassis Expansion CAN Bus
  • U18C1 CHEVROLET Lost Communication With Suspension Control Module On Chassis Expansion CAN Bus
  • U18C1 GMC Lost Communication With Suspension Control Module On Chassis Expansion CAN Bus

Need more help?

Get the U18c1 code diagnosed by a professional: Find a repair shop in your area