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U012A GMC Code - Lost Communication With Chassis Control Module

Quick Answer

The U012A diagnostic trouble code (DTC) for GMC vehicles indicates that there is a communication problem between the onboard computer system and the chassis control module. Common causes include Faulty chassis control module, Wiring or connection issues between the chassis control module and the onboard computer system, Corrosion or damage to the communication lines. 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 GMC indicates Lost Communication With Chassis Control Module.
Common causes
Common causes include Faulty chassis control module, Wiring or connection issues between the chassis control module and the onboard computer system, Corrosion or damage to the communication lines.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code U012A GMC Description

The U012A diagnostic trouble code (DTC) for GMC vehicles indicates that there is a communication problem between the onboard computer system and the chassis control module. The chassis control module is responsible for managing various functions related to the vehicle's chassis, including stability control, traction control, and the anti-lock braking system. When communication is lost with this module, it can lead to issues with the vehicle's performance and safety systems.

OBDII Code U012A GMC - Lost Communication With Chassis Control Module
U012A GMC Code - Lost Communication With Chassis Control Module

Common Causes of U012A GMC

  1. Faulty chassis control module
  2. Wiring or connection issues between the chassis control module and the onboard computer system
  3. Corrosion or damage to the communication lines
  4. Software glitches in the onboard computer system
  5. Electrical issues such as a drained battery or faulty alternator

Symptoms of U012A GMC

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunction
  3. Stability control system failure
  4. Erratic braking behavior
  5. Loss of power steering assist

How to Fix U012A GMC

  1. Diagnose the exact cause of the communication failure by using a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the wiring and connections.
  2. Check the chassis control module for any signs of damage or malfunction and replace it if necessary.
  3. Inspect and repair any damaged wiring or connections between the chassis control module and the onboard computer system.
  4. Clear the trouble codes and reset the vehicle's computer system to ensure the issue is resolved.
  5. Test drive the vehicle to confirm that the communication has been restored and the symptoms have been eliminated.

Cost to Fix U012A GMC

The cost of repairing a lost communication with the chassis control module can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing the chassis control module can range from $300 to $800, while diagnosing and fixing wiring or connection issues may cost between $100 and $300. Overall, the total repair cost for this issue could range from $200 to $1000, including parts and labor. It's recommended to get a detailed quote from a trusted auto repair shop to get an accurate estimate for your specific vehicle.

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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 GMC Code

1. What are common symptoms of the U012A GMC OBDII code?

- Common symptoms include issues with the stability control system, traction control system, and ABS system. The dashboard may display warning lights related to these systems.

2. What does the U012A GMC code "Lost Communication With Chassis Control Module" mean?

- This code indicates a communication problem between the vehicle's main computer system and the chassis control module, which manages various safety systems.

3. What are possible causes of the U012A GMC code?

- Possible causes include faulty wiring connections, damaged wiring harnesses, a malfunctioning chassis control module, or issues with the vehicle's main computer system.

4. How can I diagnose the U012A GMC code?

- Diagnosis typically involves conducting a thorough inspection of the wiring connections, checking for damaged wires or connectors, and using a diagnostic scanner to communicate with the chassis control module.

5. Can I still drive my vehicle with the U012A GMC code present?

- It is not recommended to continue driving the vehicle with the U012A code present, as it may affect the proper functioning of safety systems like ABS and traction control.

6. How can I repair the U012A GMC code?

- Repair options include checking and repairing any damaged wiring, replacing the chassis control module if necessary, and ensuring all connections are secure and free of corrosion.

7. Is it safe to clear the U012A GMC code without addressing the underlying issue?

- Clearing the code without addressing the underlying communication issue may temporarily turn off warning lights, but it will not resolve the potential safety concerns associated with malfunctioning safety systems.

8. Can a DIY enthusiast fix the U012A GMC code issue?

- Some aspects of diagnosing and repairing the U012A code may be within reach of experienced DIY enthusiasts, but dealing with complex wiring and electronic systems may require professional expertise.

9. How much does it cost to repair the U012A GMC code?

- The cost of repairing the U012A code can vary depending on the specific issue causing the communication fault. Costs may include parts, labor, and diagnostic fees.

10. Will the U012A GMC code affect my vehicle's performance?

- While the U012A code itself may not directly impact performance, it can lead to safety system malfunctions that could affect overall vehicle handling and safety.

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