What Does U0197 Mean?
Communication with the telephone control module (hands-free calling system, Bluetooth module, or telematics unit) has been lost. This module manages phone connectivity and voice communication functions.
Common Causes
35%
Telephone control module internal failure
25%
Damaged wiring or connector to phone module
20%
Antenna or antenna connection fault
15%
Power supply or fuse failure
5%
CAN network communication problem
Diagnostic Steps
1
Step 1: Verify power and ground at telephone control module connector with multimeter
2
Step 2: Inspect module location (often in overhead console or behind dashboard) for connector issues
3
Step 3: Check antenna connection and cable routing for damage or disconnection
4
Step 4: Use scan tool to monitor CAN bus and verify other communication modules are functioning
5
Step 5: Attempt module reset procedure per manufacturer specifications or test by substitution
Estimated Repair Cost
$150 - $1,000
Parts + labor, varies by vehicle and location
Communication with the telephone control module (hands-free calling system, Bluetooth module, or telematics unit) has been lost. This module manages phone connectivity and voice communication functions.
The most common cause of U0197 (Lost Communication With Telephone Control Module) is: Telephone control module internal failure
Typical repair costs for U0197 range from $150 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Minimal safety impact. May affect emergency call features if equipped, but does not impact vehicle operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0197 to identify the root cause.
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Quick Info
Category
Network
System
Telematics/Communications System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
