AutoCodes – GMC – U18BB GMC

U18BB GMC Code - Lost Communication With Power Steering Control Module On Chassis Expansion CAN Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Power Steering Control Module, Power Steering Control Module harness is open or shorted, Power Steering Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U18BB GMC indicates Lost Communication With Power Steering Control Module On Chassis Expansion CAN Bus.
Common causes: Common causes include Faulty Power Steering Control Module, Power Steering Control Module harness is open or shorted, Power Steering Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 488

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18BB GMC 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 U18BB GMC - Lost Communication With Power Steering Control Module On Chassis Expansion CAN Bus - AutoCodes.com — U18BB GMC Code - Lost Communication With Power Steering Control Module On Chassis Expansion CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18BB GMC?

Faulty Power Steering Control Module
Power Steering Control Module harness is open or shorted
Power Steering Control Module circuit poor electrical connection

How to Fix the DTC U18BB GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U18BB GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U18BB GMC code?

Need more information on how to fix the U18BB GMC code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U18BB GMC Code

What are common symptoms of OBDII code U18BB GMC?

- Common symptoms include loss of power steering assistance, illuminated power steering warning light on the dashboard, and difficulty steering the vehicle.

What are possible causes of OBDII code U18BB GMC?

- Possible causes include a faulty power steering control module, damaged wiring or connectors in the chassis expansion CAN bus, communication issues between modules, or a defective CAN bus.

How can I diagnose OBDII code U18BB GMC?

- Diagnosing this code typically involves using a diagnostic scan tool to check for other related codes, conducting a visual inspection of wiring and connectors, and performing specific tests outlined in the service manual.

How can I repair OBDII code U18BB GMC?

- Repair steps may include repairing or replacing damaged wiring or connectors, resetting the power steering control module, reprogramming modules if necessary, and ensuring proper communication between modules.

Can I drive my vehicle with OBDII code U18BB GMC?

- It is not recommended to drive the vehicle with this code present, as it can lead to loss of power steering assistance and compromise the safety of driving.

How serious is OBDII code U18BB GMC?

- This code is considered serious as it affects the power steering system, which is crucial for safe vehicle operation. It should be addressed promptly to avoid potential safety hazards.

Is it possible to prevent OBDII code U18BB GMC from occurring?

- Regular maintenance and inspections of the power steering system, CAN bus, and related components can help prevent issues that may trigger this code.

Can a DIY enthusiast fix OBDII code U18BB GMC?

- While some basic diagnostic steps can be performed by a DIY enthusiast, resolving this code may require specialized tools and expertise, making it more suitable for professional repair.

Are there any recalls related to OBDII code U18BB GMC?

- It is advisable to check with the vehicle manufacturer or a certified dealership to inquire about any recalls or technical service bulletins related to this specific OBDII code.