AutoCodes – Cadillac – U0197 Cadillac

U0197 Cadillac Code - Lost Communication With Telephone 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 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 Cadillac 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 630

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 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0197 Cadillac 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 Telephone Control Module has not been received.

OBDII Code U0197 Cadillac - Lost Communication With Telephone Control Module - AutoCodes.com — U0197 Cadillac Code - Lost Communication With Telephone Control Module

What does this mean?

What are the Possible Causes of the DTC U0197 Cadillac?

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 Cadillac?

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 Cadillac 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 U0197 Cadillac Code

1. What are the common symptoms of OBDII code U0197 in a Cadillac related to lost communication with the telephone control module?

- Common symptoms include issues with the vehicle's hands-free calling system, loss of Bluetooth connectivity, and malfunctioning voice command features.

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

- The code U0197 "Lost Communication With Telephone Control Module" can be caused by a faulty telephone control module, wiring issues, blown fuses, or software glitches.

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

- Diagnosing the U0197 code requires a scan tool to retrieve the specific trouble codes, followed by inspecting the wiring connections to the telephone control module and testing for proper voltage.

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

- In most cases, it is safe to drive your Cadillac with the U0197 code present, but it's recommended to have the issue diagnosed and repaired as soon as possible to avoid any inconvenience with the vehicle's communication systems.

5. Is it possible to repair the U0197 code in a Cadillac on my own?

- While some simple fixes like checking for loose connections or blown fuses can be done by DIY enthusiasts, diagnosing and repairing the root cause of the U0197 code often requires specialized tools and expertise, best left to professionals.

6. Will resetting the OBDII code U0197 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the lost communication with the telephone control module is not fixed, the code is likely to reappear.

7. How much does it typically cost to repair the U0197 code in a Cadillac?

- The cost of repairing the U0197 code can vary depending on the cause of the issue. Simple fixes like replacing a blown fuse may cost less, while replacing a faulty telephone control module can be more expensive.

8. Can a dead battery cause the U0197 code to appear in a Cadillac?

- A dead or low battery can sometimes trigger communication errors in various modules, including the telephone control module, potentially leading to the U0197 code being stored.

9. Are there any preventive measures to avoid the U0197 code in a Cadillac?

- Regularly checking the vehicle's battery health, keeping electrical connections clean and secure, and following maintenance schedules can help prevent issues that may trigger the U0197 code.

10. How long does it typically take to repair the U0197 code in a Cadillac?

- The repair time for the U0197 code can vary based on the complexity of the issue. Simple fixes may take a short time, while more involved repairs could require several hours or even days, depending on the availability of parts and labor.