AutoCodes – Chevrolet – U18AB Chevrolet

U18AB Chevrolet Code - Transmission Range Control Module Lost Communication With Chassis Control Module On High Speed CAN Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Chassis Control Module, Chassis Control Module harness is open or shorted, Chassis 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: U18AB Chevrolet indicates Transmission Range Control Module Lost Communication With Chassis Control Module On High Speed CAN Bus.
Common causes: Common causes include Faulty Chassis Control Module, Chassis Control Module harness is open or shorted, Chassis 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 553

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18AB Chevrolet 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 U18AB Chevrolet - Transmission Range Control Module Lost Communication With Chassis Control Module On High Speed CAN Bus - AutoCodes.com — U18AB Chevrolet Code - Transmission Range Control Module Lost Communication With Chassis Control Module On High Speed CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18AB Chevrolet?

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

How to Fix the DTC U18AB Chevrolet?

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 U18AB Chevrolet 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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Need more information on how to fix the U18AB Chevrolet 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 U18AB Chevrolet Code

1. What are the common symptoms of OBDII code U18AB in a Chevrolet related to the Transmission Range Control Module Lost Communication With Chassis Control Module On High Speed CAN Bus?

- Common symptoms include issues with shifting gears, transmission slippage, dashboard warning lights related to the transmission system, and potential loss of power.

2. What are the possible causes of OBDII code U18AB in a Chevrolet?

- The code U18AB can be triggered by a faulty transmission range control module, problems with the chassis control module, damaged wiring or connectors in the CAN bus system, or a communication breakdown between the modules.

3. How can I diagnose the U18AB code in my Chevrolet?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific error code, checking for any related codes or issues, inspecting the wiring and connectors for damage, and testing the functionality of the transmission and chassis control modules.

4. What are the recommended repair tips for resolving the U18AB code in a Chevrolet?

- Repair tips may include repairing or replacing damaged wiring or connectors, resetting the transmission range control module, updating software or firmware in the control modules, or replacing faulty components if necessary.

5. Can I drive my Chevrolet with the U18AB code present?

- It is not recommended to drive your vehicle with the U18AB code present, as it can lead to potential transmission issues and safety hazards. It is advisable to address the problem promptly to avoid further damage.

6. How much does it typically cost to repair the U18AB code in a Chevrolet?

- The cost of repair can vary depending on the specific cause of the code, the extent of the damage, and whether any components need replacement. It is recommended to consult a professional mechanic for an accurate estimate.

7. Are there any preventive measures to avoid the U18AB code in a Chevrolet?

- Regular maintenance and inspections of the transmission and chassis control modules, as well as the CAN bus system, can help prevent issues that may trigger the U18AB code. Keeping an eye on warning signs and addressing them promptly can also help avoid this problem.