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Engine-Codes – Generic – U0197

U0197 Code - Lost Communication With Telephone Control Module

Quick Answer

The U0197 diagnostic trouble code indicates that the vehicle's onboard computer has lost communication with the Telephone Control Module (TCM). Common causes include Faulty Telephone Control Module, Wiring issues or damaged wiring harness, Software glitches in the TCM. 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 indicates Lost Communication With Telephone Control Module.
Common causes
Common causes include Faulty Telephone Control Module, Wiring issues or damaged wiring harness, Software glitches in the TCM.
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 12, 2024
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Code U0197 Description

The U0197 diagnostic trouble code indicates that the vehicle's onboard computer 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 telecommunications features. When communication with the TCM is disrupted, it can have several implications for the vehicle's overall performance and functionality.

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

Common Causes of U0197

  1. Faulty Telephone Control Module
  2. Wiring issues or damaged wiring harness
  3. Software glitches in the TCM
  4. Weak battery affecting communication systems
  5. Water damage or corrosion in the TCM or wiring connections

Symptoms of U0197

  1. Loss of Bluetooth connectivity
  2. Inability to make or receive phone calls through the infotainment system
  3. Voice command system not functioning properly
  4. Audio streaming not working
  5. Error message on the dashboard indicating communication failure

How to Fix U0197

  1. Begin by conducting a thorough inspection of the wiring harness and connections related to the TCM. Look for any signs of damage, corrosion, or loose connections.
  2. Test the battery voltage to ensure it is within the recommended range. A weak battery can sometimes cause communication issues between modules.
  3. If no issues are found with the wiring or battery, proceed to diagnose the TCM itself. This may involve using a diagnostic scan tool to check for error codes and perform a reset.
  4. If the TCM is determined to be faulty, it will need to be replaced with a new unit. Ensure that the replacement TCM is compatible with your vehicle's make and model.
  5. After replacing the TCM, perform a final diagnostic scan to clear the error code and ensure that communication is restored between the TCM and the vehicle's onboard computer.

Cost to Fix U0197

The cost of repairing a lost communication issue with the Telephone Control Module can vary depending on the underlying cause of the problem. In general, the cost of a new TCM can range from $200 to $800, depending on the vehicle make and model. Labor costs for diagnosis and replacement can add an additional $100 to $300 to the total repair bill. Overall, the total repair cost for this issue can range from $300 to $1100, including parts and labor. It's important to note that prices may vary based on location, vehicle type, and shop rates. Be sure to consult with a qualified mechanic to get an accurate estimate for your specific situation.

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Code U0197 Information for Specific Makes

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.

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