What Does B2201 Mean?
This code indicates that the Body Control Module (BCM) or another control module has lost communication with the TrafficMaster module, which is typically part of a vehicle's telematics or connected services system. The communication failure means the module cannot send or receive data over the vehicle's communication network (typically CAN bus or LIN bus). This affects remote services, GPS tracking, emergency services connectivity, and potentially theft deterrent features depending on the vehicle's configuration.
Common Causes
40%
Faulty or failed TrafficMaster module due to internal component failure or power supply issues
30%
Damaged, corroded, or loose wiring harness connections between the TrafficMaster module and the vehicle communication network
20%
CAN bus or communication network fault affecting multiple modules or network segment failure
10%
Blown fuse or open circuit in the TrafficMaster module power or ground circuit
Diagnostic Steps
1
Visually inspect the TrafficMaster module location (typically mounted under dash, in headliner, or trunk area) for physical damage, water intrusion, disconnected connectors, or corroded terminals
2
Using a digital multimeter, verify power and ground supply at the TrafficMaster module connector (check for battery voltage on power pins and less than 0.5 ohms resistance to ground on ground pins)
3
Check all fuses related to the telematics or TrafficMaster system using fuse diagram in service information, replace any blown fuses and retest
4
Using the scan tool, attempt to communicate directly with the TrafficMaster module and check communication status with all other modules to determine if this is an isolated module failure or network-wide issue
5
Perform CAN bus voltage testing at the TrafficMaster module connector (CAN-H should read approximately 2.5-3.5V and CAN-L should read approximately 1.5-2.5V with key on, engine off)
6
If all power, ground, and communication circuits test normal but module still does not respond, replace the TrafficMaster module and reprogram/activate according to manufacturer procedures
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or another control module has lost communication with the TrafficMaster module, which is typically part of a vehicle's telematics or connected services system. The communication failure means the module cannot send or receive data over the vehic...
The most common cause of B2201 (No Communication With Traffic MasterModule) is: Faulty or failed TrafficMaster module due to internal component failure or power supply issues
Typical repair costs for B2201 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle drivability or safety systems and it is safe to continue driving. However, emergency services (OnStar, SOS features), GPS tracking, remote start, and stolen vehicle location features will be unavailable until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2201 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Body Control and Telematics System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
