B2201

Code

Generic B — Body

No Communication With Traffic MasterModule

Brand: Generic

Type: B — Body

Views: UK: 37 EN: 59 RU: 34

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty or powered-off Traffic Master Module
Open or shorted CAN/LIN data bus wiring or connectors
Blown fuse or missing power/ignition feed to the module
Poor or open ground(s)
Network termination fault (open or shorted termination resistors)
Software/firmware mismatch or corrupted module programming

Symptoms

No traffic data or navigation-related services available
Warning message about module or communication fault on cluster or infotainment
Other modules reporting network communication errors
Intermittent loss of related features or sporadic behavior
DTC stored/active and inability to communicate with TMM using a scan tool

What to check

Read all network-related DTCs with a capable scan tool and note status (current/historic)
Verify battery voltage and battery condition
Check fuses and power feeds for the Traffic Master Module (ignition-switched and constant)
Verify module ground(s) for continuity to chassis
Attempt to communicate with the TMM using OEM scan tool; note response and bus errors
Visually inspect TMM connector and wiring for corrosion, damage, or water intrusion

Signal parameters

CAN bus frames/messages: TMM should transmit and receive specific CAN IDs (use OEM network list)
CAN High/CAN Low idle voltages ~2.5 V each (verify nominal voltages with key ON)
Bus differential voltage when active ~1.0–3.0 V (dependent on network load)
Bus termination resistance expected within nominal range (refer to OEM, typically low tens to ~120 ohms across CAN_H and CAN_L with key OFF)
Power voltage at module 12 V (battery) and switched ignition feed present when required
Module ground resistance very low (

Diagnostic algorithm

Retrieve freeze frame and all related DTCs. Confirm B2201 is current and note any U-/B-codes.
Verify battery voltage >=12 V and good battery connections. Some modules enter sleep with low voltage.
Check fuses and relays feeding the Traffic Master Module; restore any blown fuses and retest communication.
With ignition ON, attempt communication with an OEM-level scan tool. Observe bus errors and whether the module responds.
Inspect the TMM connector for bent pins, corrosion, or moisture. Back-probe power and ground pins: verify 12 V (or specified feed) and good chassis ground.
Check CAN/LIN wiring continuity from the TMM connector to nearest network gateway or junction module. Repair any opens, shorts to ground or battery, and loose splice connections.
Measure CAN_H/CAN_L voltages with key ON and compare to expected ranges. Use an oscilloscope to confirm valid CAN frames if available.
Verify termination resistance across CAN_H and CAN_L with key OFF. Investigate if resistance is out of expected range (open or shorted termination).
Disconnect any aftermarket devices on the bus. Clear codes and re-scan to see if code returns.
Reflash or update the Traffic Master Module software if a manufacturer service bulletin or update exists and scan tool indicates software mismatch.
If wiring, power, and grounds are good and the module still does not communicate, consider module replacement per OEM procedures. Program/configure replacement module before final test.
After repairs, clear DTCs and verify normal communication and operation over a road test or extended key cycles as specified.

Likely causes

Blown fuse or lost ignition power to the Traffic Master Module
Damaged connector or corrosion at the TMM harness
CAN bus short or open near the module or wiring harness damage
Defective Traffic Master Module
Vehicle module configuration or software issue after service or battery disconnect