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U012A Cadillac 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 Cadillac 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 3,292

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

What does this mean?

What are the Possible Causes of the DTC U012A Cadillac?

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 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 U012A 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 U012A Cadillac Code

1. What are common symptoms of the U012A Cadillac code "Lost Communication With Chassis Control Module"?

- Common symptoms include illuminated warning lights on the dashboard, issues with the ABS system, traction control problems, and potential loss of communication with the chassis control module.

2. What could cause the U012A code to appear in a Cadillac?

- The U012A code can be triggered by issues such as damaged wiring, loose connections, a faulty chassis control module, or a problem with the vehicle's network communication system.

3. How can I diagnose the U012A code in my Cadillac?

- To diagnose the U012A code, you can use an OBDII scanner to retrieve the code and investigate the chassis control module, wiring, and connections for any signs of damage or malfunction.

4. Can I continue driving my Cadillac with the U012A code present?

- It is not recommended to drive your Cadillac with the U012A code present, as it can affect the proper functioning of crucial safety systems like ABS and traction control.

5. How can I repair the U012A Cadillac code "Lost Communication With Chassis Control Module"?

- Repairing the U012A code involves inspecting and repairing any damaged wiring, ensuring all connections are secure, possibly replacing the chassis control module, and clearing the code with an OBDII scanner.

6. Does the U012A code require a visit to a dealership or can it be fixed at an independent repair shop?

- The U012A code can often be addressed by independent repair shops that have the necessary diagnostic tools and expertise to diagnose and repair communication issues with the chassis control module.

7. Are there any DIY steps I can take to troubleshoot the U012A code in my Cadillac?

- DIY steps for troubleshooting the U012A code include checking for loose connections, inspecting wiring for damage, and ensuring all fuses related to the chassis control module are intact.

8. How much does it typically cost to repair the U012A Cadillac code?

- The cost of repairing the U012A code can vary depending on the specific underlying issue, but it may range from a few hundred dollars for simple fixes like wiring repairs to potentially over a thousand dollars if the chassis control module needs replacement.

9. Will resetting the U012A code resolve the issue temporarily?

- Resetting the U012A code may temporarily clear the warning lights, but if the underlying issue causing the communication loss with the chassis control module is not addressed, the code is likely to reappear.

10. Can extreme weather conditions or rough driving cause the U012A code to trigger in a Cadillac?

- Extreme weather conditions or rough driving can potentially contribute to the triggering of the U012A code by putting additional stress on the vehicle's electrical systems and components. Regular maintenance can help prevent such issues.