AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Generic - U18B5

U18B5 Code - Lost Communication With Hybrid Powertrain Control Module On Chassis Expansion CAN Bus

- Code Popularity: 1,017 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
By AutoCodes.com - Updated Jun 08, 2020
Share on Facebook   Share on Twitter   Share on Linkedin

|U18B5 code possible causes

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

|How do I fix code U18B5 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 U18B5 code

Labor: 1.0

The cost of diagnosing the U18B5 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|What are U18B5 code possible symptoms?

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

|U18B5 code description

Devices connected to the Chassis high speed General Motor Local Area Network (GMLAN) 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 Motor Control Modules and the Hybrid Powertrain Control Module 1 are all internal to the Power Inverter Module. Communication diagnostics for the serial data, including device power and ground as well as the wakeup circuits for Motor Control Modules and the Hybrid Powertrain Control Module 1 are all diagnosed from external sources only to the Power Inverter Module connector because any circuit fault condition within the Power Inverter Module will cause a complete replacement.The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18b5 - Lost Communication With Hybrid Powertrain Control Module On Chassis Expansion CAN Bus - AutoCodes.com
U18B5 Code - Lost Communication With Hybrid Powertrain Control Module On Chassis Expansion CAN Bus

|Need more information with the U18B5 code?

Need more information on how to fix the U18B5 code?
Get Access to Factory Service Manuals

|Information for specific makes

  • U18B5 BUICK Lost Communication With Hybrid Powertrain Control Module On Chassis Expansion CAN Bus
  • U18B5 CADILLAC Lost Communication With Hybrid Powertrain Control Module On Chassis Expansion CAN Bus
  • U18B5 CHEVROLET Lost Communication With Hybrid Powertrain Control Module On Chassis Expansion CAN Bus
  • U18B5 GMC Lost Communication With Hybrid Powertrain Control Module On Chassis Expansion CAN Bus

|Need help with a U18B5 code?

Get the U18b5 code diagnosed by a professional: Find a repair shop in your area

|U18B5 code comments

Help us improve AutoCodes.com. 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 U18b5 code? Have you replaced any parts?
Any information is appreciated. Thanks