AutoCodes – Buick – U012A Buick

U012A Buick Code - Lost Communication With Chassis Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) 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: U012A Buick indicates Lost Communication With Chassis Control Module.
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 1,528

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 Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U012A Buick Description

Modules connected to the 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 modules. The modules 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 module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Chassis Control Module has not been received.

OBDII Code U012A Buick - Lost Communication With Chassis Control Module - AutoCodes.com — U012A Buick Code - Lost Communication With Chassis Control Module

What does this mean?

What are the Possible Causes of the DTC U012A Buick?

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

How to Fix the DTC U012A Buick?

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 U012A Buick 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 U012A Buick Code

1. What does the OBDII code U012A for Buick indicate?

The U012A code signifies a communication problem between the vehicle's onboard diagnostic system and the Chassis Control Module (CCM).

2. What are the common symptoms of a U012A code in a Buick?

Common symptoms include the ABS warning light coming on, traction control issues, erratic speedometer readings, and potential loss of power steering assistance.

3. What are some possible causes of the U012A code in a Buick?

Causes may include damaged wiring or connectors, a faulty Chassis Control Module, low battery voltage, or a software glitch in the control modules.

4. How can I diagnose the U012A code in my Buick?

Diagnosis typically involves using a professional OBDII scanner to read the code, checking for other related codes, and conducting a thorough inspection of the wiring and connections.

5. Can I continue driving my Buick with a U012A code present?

It is not recommended to drive the vehicle with a U012A code, as it may affect the performance and safety features controlled by the Chassis Control Module.

6. What are some repair tips for fixing the U012A code in a Buick?

Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, resetting the control modules, or replacing the Chassis Control Module if necessary.

7. Is it possible to reset the U012A code in a Buick without professional help?

While you can attempt to clear the code using an OBDII scanner, it is essential to address the underlying issue causing the communication problem to prevent the code from reappearing.

8. How much does it typically cost to repair the U012A code in a Buick?

Repair costs can vary depending on the specific cause of the issue, but expenses may include labor costs for diagnosis and repair, as well as potential part replacements.

9. Can a U012A code in a Buick be related to other system malfunctions?

Yes, since the Chassis Control Module interacts with various vehicle systems, a U012A code can sometimes be linked to issues with ABS, traction control, stability control, or power steering.

10. Are there any recalls or technical service bulletins related to the U012A code in Buick vehicles?

It is advisable to check with a Buick dealership or the manufacturer's website for any relevant recalls or technical service bulletins related to the U012A code and Chassis Control Module communication problems.