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AutoCodes – Generic – U0197

U0197 Code - Lost Communication With Telephone Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Telephone Control Module, Telephone Control Module harness is open or shorted, Telephone 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
U0197 indicates Lost Communication With Telephone Control Module.
Common causes
Common causes include Faulty Telephone Control Module, Telephone Control Module harness is open or shorted, Telephone 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 13,566
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Apr 02, 2020
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Code U0197 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Telephone Control Module has not been received.
OBDII Code U0197 - Lost Communication With Telephone Control Module - AutoCodes.com
U0197 Code - Lost Communication With Telephone Control Module
What does this mean?

What are the Possible Causes of the DTC U0197?

  • Faulty Telephone Control Module
  • Telephone Control Module harness is open or shorted
  • Telephone Control Module circuit poor electrical connection

How to Fix the DTC U0197?

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 U0197 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.

Need more information about the U0197 code?

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Need Help with the Code?

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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.

Frequently Asked Questions about U0197 Code

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