What Does U0198 Mean?
The powertrain control module (PCM) or gateway module has lost communication with the telematics control module over the vehicle's communication network (CAN bus). This indicates a network fault preventing data exchange with the vehicle's connectivity/cellular system.
Common Causes
35%
Telematics control module failure or loss of power/ground
30%
CAN bus wiring fault between TCM and network (open, short, or high resistance)
20%
Blown fuse or open circuit in telematics module power supply
10%
Gateway module failure preventing network communication
5%
Faulty CAN bus termination resistor or network architecture issue
Diagnostic Steps
1
Step 1: Verify telematics module fuse integrity and check for power and ground at the TCM connector using a multimeter
2
Step 2: Using scan tool, check if other modules can communicate on the network to isolate if issue is TCM-specific or network-wide
3
Step 3: Measure CAN bus resistance between CAN-High and CAN-Low at TCM connector (should be 60 ohms with key off on most systems)
4
Step 4: Inspect TCM connector and wiring harness for corrosion, damage, or moisture intrusion
5
Step 5: If all wiring and power are good, perform TCM replacement and reprogram/configure as needed
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) or gateway module has lost communication with the telematics control module over the vehicle's communication network (CAN bus). This indicates a network fault preventing data exchange with the vehicle's connectivity/cellular system.
The most common cause of U0198 (Lost Communication With Telematic Control Module) is: Telematics control module failure or loss of power/ground
Typical repair costs for U0198 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. Loss of remote services, emergency call features, and connected vehicle functions may occur.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0198 to identify the root cause.
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Quick Info
Category
Network
System
Telematics/Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
