AutoCodes – Chevrolet – U012A Chevrolet

U012A Chevrolet 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 Chevrolet 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 4,674

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

What does this mean?

What are the Possible Causes of the DTC U012A 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 U012A 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 U012A 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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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 Chevrolet Code

1. What are the common symptoms of OBDII code U012A in a Chevrolet related to lost communication with the chassis control module?

- Common symptoms may include issues with ABS, traction control, stability control, and potentially a disabled cruise control system.

2. What are some possible causes of the U012A code indicating a communication problem with the chassis control module in a Chevrolet?

- Possible causes can include a faulty chassis control module, wiring issues, a damaged connector, or a malfunctioning CAN bus.

3. How can I diagnose the U012A code in my Chevrolet indicating a communication loss with the chassis control module?

- Diagnosis typically involves checking the chassis control module for power and ground, inspecting the wiring harness for damage, and using a diagnostic scan tool to communicate with the module.

4. Is it safe to continue driving my Chevrolet with the U012A code related to lost communication with the chassis control module?

- It's not recommended to continue driving with this code unresolved, as it may affect the vehicle's stability control systems and potentially compromise safety.

5. Can a DIY enthusiast repair the U012A code indicating lost communication with the chassis control module in a Chevrolet?

- While some basic checks like inspecting wiring connections can be done by DIYers, diagnosing and repairing the root cause often requires professional diagnostic equipment and expertise.

6. How much does it typically cost to repair the U012A code in a Chevrolet due to lost communication with the chassis control module?

- Repair costs can vary depending on the specific issue, but they may range from a couple of hundred dollars for wiring repairs to over a thousand dollars for a new chassis control module.

7. Are there any preventative maintenance tips to avoid encountering the U012A code in a Chevrolet related to the chassis control module?

- Regularly inspecting the wiring harness for signs of wear or damage, ensuring connectors are secure, and promptly addressing any warning lights related to the vehicle's stability control system can help prevent this issue.

8. Can a dead battery cause the U012A code to appear in a Chevrolet indicating lost communication with the chassis control module?

- Yes, a dead or weak battery can potentially cause communication issues between modules in the vehicle, leading to the U012A trouble code.

9. Will resetting the trouble codes clear the U012A code related to the chassis control module communication problem in a Chevrolet?

- Resetting the codes may temporarily clear the warning light, but if the underlying issue causing the U012A code is not addressed, it is likely to reappear after driving the vehicle.

10. Is it possible for a software update to resolve the U012A code issue indicating lost communication with the chassis control module in a Chevrolet?

- In some cases, a software update provided by the manufacturer may address communication issues between modules, but it's essential to ensure the root cause is properly diagnosed before attempting an update.