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U0197 Chevrolet Code - Lost Communication With Telephone Control Module

Quick Answer

The U0197 diagnostic trouble code (DTC) for Chevrolet vehicles indicates that the vehicle's onboard computer system has lost communication with the Telephone Control Module (TCM). Common causes include Wiring faults or damaged wiring harness, Loose connections between the TCM and the vehicle's onboard computer system, Faulty TCM unit. 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
U0197 Chevrolet indicates Lost Communication With Telephone Control Module.
Common causes
Common causes include Wiring faults or damaged wiring harness, Loose connections between the TCM and the vehicle's onboard computer system, Faulty TCM unit.
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 07, 2024
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Code U0197 Chevrolet Description

The U0197 diagnostic trouble code (DTC) for Chevrolet vehicles indicates that the vehicle's onboard computer system has lost communication with the Telephone Control Module (TCM). The TCM is responsible for managing the vehicle's hands-free calling system, Bluetooth connectivity, and other related functions. When communication with the TCM is lost, it can disrupt the operation of these features and potentially affect the overall performance of the vehicle.

OBDII Code U0197 Chevrolet - Lost Communication With Telephone Control Module
U0197 Chevrolet Code - Lost Communication With Telephone Control Module

Common Causes of U0197 Chevrolet

  1. Wiring faults or damaged wiring harness
  2. Loose connections between the TCM and the vehicle's onboard computer system
  3. Faulty TCM unit
  4. Software glitches or communication errors within the vehicle's electronics
  5. Issues with the vehicle's CAN (Controller Area Network) communication network

Symptoms of U0197 Chevrolet

  1. Inability to make or receive phone calls through the hands-free system
  2. Loss of Bluetooth connectivity for audio streaming or phone calls
  3. Malfunctioning voice command functions
  4. Error messages related to the TCM displayed on the infotainment system

How to Fix U0197 Chevrolet

  1. Perform a visual inspection of the wiring harness and connections to identify any damaged or loose components.
  2. Use a diagnostic scan tool to communicate with the TCM and check for error codes or communication issues.
  3. Test the TCM unit for proper functionality and replace it if necessary.
  4. Update the software of the vehicle's onboard computer system to address any communication errors.
  5. Clear the DTC codes and perform a test drive to verify that the issue has been resolved.

Cost to Fix U0197 Chevrolet

The typical repair costs for addressing the U0197 code can vary depending on the specific cause of the communication loss and the required repairs. In general, the cost of parts such as a new TCM unit or wiring harness can range from $200 to $500, while labor costs for diagnosis and repair may add another $150 to $300. Overall, the total repair cost for this issue could be in the range of $350 to $800. It's important to note that the actual costs may vary based on factors such as the location of the repair shop, the vehicle's make and model, and the type of engine. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate based on the specific circumstances.

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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 U0197 Chevrolet Code

1. What are the common symptoms of OBDII code U0197 in a Chevrolet related to the Telephone Control Module?

- Common symptoms include loss of connectivity with the phone system, issues with hands-free calling, and potential problems with other vehicle communication systems.

2. What are some possible causes of the U0197 trouble code in a Chevrolet?

- Causes may include a faulty telephone control module, damaged wiring or connectors, software issues, or a weak battery.

3. How can I diagnose the U0197 code in my Chevrolet?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the telephone control module and related wiring, and checking for any other communication system faults.

4. Can I still drive my Chevrolet with the U0197 trouble code present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent any potential communication system failures.

5. Is it possible to reset the U0197 code in a Chevrolet without fixing the underlying issue?

- While clearing the code can temporarily turn off the check engine light, the root cause should be identified and repaired to prevent the code from reoccurring.

6. Are there any simple repairs I can try to fix the U0197 code in my Chevrolet?

- Basic steps like checking and securing wiring connections, ensuring the telephone control module is properly seated, and performing a battery reset may resolve the issue in some cases.

7. Will replacing the telephone control module fix the U0197 code in my Chevrolet?

- Replacing the telephone control module is a common repair for this code and can often resolve communication issues with the telephone system.

8. Can a low battery cause the U0197 trouble code in a Chevrolet?

- Yes, a weak or failing battery can impact the communication systems in the vehicle and potentially trigger the U0197 code.

9. How long does it typically take to repair the U0197 code in a Chevrolet?

- The repair time can vary depending on the exact cause of the code, but simple fixes like reconnecting wiring may take a short time, while module replacements could require more extensive work.

10. Should I seek professional help to diagnose and repair the U0197 trouble code in my Chevrolet?

- If you are not experienced with automotive diagnostics or repairs, it is advisable to consult a professional mechanic or dealership to accurately diagnose and fix the issue related to the U0197 code.

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