B2198 TrafficMaster Module Fault
Diagnostic trouble code B2198 indicates that the Body Control Module (BCM) or the Vehicle Communication Interface Module (VCIM/OnStar) has detected an internal failure in the TrafficMaster module (RDS-TMC traffic receiver) or a loss of serial communication with it. This module is responsible for receiving real-time traffic information for the navigation system.
1. Commonly Affected Makes
2. Most Common Causes
- Internal failure of the TrafficMaster module (RDS-TMC receiver)
- Loss of power or ground to the TrafficMaster module
- Open, short to ground/battery, or high resistance in the serial communication circuit (Class 2 / GMLAN)
- Failure in the Vehicle Communication Interface Module (VCIM) or Navigation Radio that hosts the TrafficMaster logic
- Outdated or corrupted module software
3. Symptoms You Will Notice
- Navigation system unable to receive real-time traffic updates
- Traffic information unavailable or inaccurate on the display
4. Step-by-Step Diagnosis
Scan for related codes in BCM, VCIM, and radio modules
Check power and ground circuits at the TrafficMaster module connector
Inspect serial communication circuit for opens, shorts, or high resistance
Verify module software version and update if necessary
Perform a module self-test or swap with known-good unit if available
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle remains safe to drive. The fault only affects traffic data reception for the navigation system.
How much does it cost to fix?▼
Repair costs typically range from $100 to $600, depending on whether the issue is a wiring repair, module replacement, or software update.