Engine-Codes - Generic - U18BF

U18BF - Secondary High Speed CAN Bus Subnet Configuration List

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

U18BF Possible Causes

  • Faulty Module that is not configured
  • Module harness is open or shorted
  • Module circuit poor electrical connection

How is the U18BF 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 U18BF code

Labor: 1.0

The cost to diagnose the U18BF 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.
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Possible Symptoms

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

U18BF Meaning

The devices on the high-speed General Motor Local Area Network (GMLAN) serial data bus and the chassis high-speed GMLAN serial data bus must be programmed with software that specifically identifies the correct type and quantity of devices on the bus based on RPO configuration. If a device was not properly configured after installation, the appropriate U Code may be set for that device. No external circuit diagnosis is involved. The Diagnostic Trouble Code (DTC) will set when the device is not configured properly or the device recognizes a programming error.

More Information

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Information for specific makes

  • U18BF BUICK Secondary High Speed CAN Bus Subnet Configuration List
  • U18BF CADILLAC Secondary High Speed CAN Bus Subnet Configuration List
  • U18BF CHEVROLET Secondary High Speed CAN Bus Subnet Configuration List
  • U18BF GMC Secondary High Speed CAN Bus Subnet Configuration List

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