AutoCodes – Cadillac – U18BB Cadillac

U18BB Cadillac 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 Cadillac 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 526

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 Cadillac 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 Cadillac - Lost Communication With Power Steering Control Module On Chassis Expansion CAN Bus - AutoCodes.com — U18BB Cadillac 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 Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

1. What are the common symptoms of OBDII code U18BB in a Cadillac related to lost communication with the power steering control module?

The common symptoms include loss of power steering assist, illuminated power steering warning light on the dashboard, and potential difficulty controlling the vehicle.

2. What are some possible causes of the U18BB code in a Cadillac indicating lost communication with the power steering control module?

Possible causes include a faulty power steering control module, damaged wiring or connectors in the CAN bus system, a malfunctioning power steering system, or a communication error within the vehicle's network.

3. How can I diagnose the U18BB trouble code in my Cadillac related to communication issues with the power steering control module?

Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking for additional related codes, inspecting the power steering control module and associated wiring, and verifying the integrity of the CAN bus connections.

4. Is it safe to continue driving my Cadillac with the U18BB code indicating lost communication with the power steering control module?

It is not recommended to drive the vehicle with this code present, as it may result in unpredictable power steering behavior that could compromise safety. It is advisable to address the issue promptly.

5. How can I repair the U18BB code in my Cadillac caused by lost communication with the power steering control module?

Repair options may include repairing or replacing damaged wiring or connectors, replacing the power steering control module if necessary, resetting the code with a diagnostic tool, and ensuring proper communication within the CAN bus system.

6. Can a DIY enthusiast fix the U18BB trouble code in a Cadillac related to communication problems with the power steering control module?

While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing complex communication issues with the power steering control module may require professional expertise and specialized tools.

7. Is the U18BB code a common issue in Cadillac vehicles, specifically related to power steering control module communication problems?

The U18BB code related to lost communication with the power steering control module is relatively uncommon but can occur in Cadillac vehicles due to various factors such as electrical faults or component failures.

8. Are there any recalls or technical service bulletins related to the U18BB trouble code in Cadillac vehicles?

It is advisable to check with Cadillac dealerships or online resources for any relevant recalls or technical service bulletins specifically addressing the U18BB code related to communication issues with the power steering control module.

9. Can a faulty power steering control module trigger the U18BB trouble code in a Cadillac?

Yes, a faulty power steering control module can cause the U18BB code to appear due to communication breakdowns within the module or between the module and the vehicle's CAN bus network.