OBD-II Fault Code

B2201: No Communication With Traffic MasterModule

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2201.

System family

Body

Generic/SAE

Repair category

Network / communication

Use this category to narrow your checks before replacing parts.

Severity

High

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What B2201 usually means

No Communication With Traffic MasterModule.

Common symptoms

Body/accessory warning lamp or feature not working

Likely causes

Low battery voltage; Blown module fuse; Poor ground; Open/short on communication bus; Module offline

Diagnostic checks

Check related fuses, connectors, grounds and switch/module power supply; Run a full system scan to identify modules not responding; Inspect CAN/SCP wiring, connectors and grounds

Repair guidance

Repair power/ground or network wiring fault first; Only consider module replacement after wiring and power supply checks pass

Verification after repair

Operate the affected body/accessory system and rescan

Note: Confirm vehicle make/model/year because manufacturer-specific codes can vary. A DTC identifies a circuit or system condition, not always the failed part.