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Home / DTC / B2201 — No Communication With Traffic MasterModule

B2201 — No Communication With Traffic MasterModule

Detailed page for trouble code B2201.

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59brands
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22,491specific
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Code

B2201

Generic B — Body

No Communication With Traffic MasterModule

Brand: Generic
Type: B — Body
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

  1. Retrieve freeze frame and all related DTCs. Confirm B2201 is current and note any U-/B-codes.
  2. Verify battery voltage >=12 V and good battery connections. Some modules enter sleep with low voltage.
  3. Check fuses and relays feeding the Traffic Master Module; restore any blown fuses and retest communication.
  4. With ignition ON, attempt communication with an OEM-level scan tool. Observe bus errors and whether the module responds.
  5. 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.
  6. 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.
  7. Measure CAN_H/CAN_L voltages with key ON and compare to expected ranges. Use an oscilloscope to confirm valid CAN frames if available.
  8. Verify termination resistance across CAN_H and CAN_L with key OFF. Investigate if resistance is out of expected range (open or shorted termination).
  9. Disconnect any aftermarket devices on the bus. Clear codes and re-scan to see if code returns.
  10. Reflash or update the Traffic Master Module software if a manufacturer service bulletin or update exists and scan tool indicates software mismatch.
  11. 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.
  12. 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

Fault status

⚠️ Status
No Communication With Traffic Master Module (lost communication on vehicle network)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
9,402

The library contains 9,402 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

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89
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193
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75
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26
GENESIS
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138
HYUNDAI
371
ISUZU
86
KIA
128
LAND ROVER
320
LEXUS
280
LINCOLN
166
MERCEDES-BENZ
856
MERCURY
296
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406
PORSCHE
136
TESLA
58
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2,209
TRIUMPH
131
VOLKSWAGEN
626
VOLVO
221
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Code

B2201

HUMMER B — Body

Left Front Window Switch Stuck in Down Position

Brand: HUMMER
Type: B — Body
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

  1. Retrieve freeze frame and all related DTCs. Confirm B2201 is current and note any U-/B-codes.
  2. Verify battery voltage >=12 V and good battery connections. Some modules enter sleep with low voltage.
  3. Check fuses and relays feeding the Traffic Master Module; restore any blown fuses and retest communication.
  4. With ignition ON, attempt communication with an OEM-level scan tool. Observe bus errors and whether the module responds.
  5. 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.
  6. 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.
  7. Measure CAN_H/CAN_L voltages with key ON and compare to expected ranges. Use an oscilloscope to confirm valid CAN frames if available.
  8. Verify termination resistance across CAN_H and CAN_L with key OFF. Investigate if resistance is out of expected range (open or shorted termination).
  9. Disconnect any aftermarket devices on the bus. Clear codes and re-scan to see if code returns.
  10. Reflash or update the Traffic Master Module software if a manufacturer service bulletin or update exists and scan tool indicates software mismatch.
  11. 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.
  12. 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

Fault status

⚠️ Status
No Communication With Traffic Master Module (lost communication on vehicle network)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
Repair manuals

Manual library for HUMMER

138

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Code

B2201

LAND ROVER B — Body

No communication to the TrafficMaster Module

Brand: LAND ROVER
Type: B — Body
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

  1. Retrieve freeze frame and all related DTCs. Confirm B2201 is current and note any U-/B-codes.
  2. Verify battery voltage >=12 V and good battery connections. Some modules enter sleep with low voltage.
  3. Check fuses and relays feeding the Traffic Master Module; restore any blown fuses and retest communication.
  4. With ignition ON, attempt communication with an OEM-level scan tool. Observe bus errors and whether the module responds.
  5. 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.
  6. 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.
  7. Measure CAN_H/CAN_L voltages with key ON and compare to expected ranges. Use an oscilloscope to confirm valid CAN frames if available.
  8. Verify termination resistance across CAN_H and CAN_L with key OFF. Investigate if resistance is out of expected range (open or shorted termination).
  9. Disconnect any aftermarket devices on the bus. Clear codes and re-scan to see if code returns.
  10. Reflash or update the Traffic Master Module software if a manufacturer service bulletin or update exists and scan tool indicates software mismatch.
  11. 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.
  12. 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

Fault status

⚠️ Status
No Communication With Traffic Master Module (lost communication on vehicle network)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

B2201

MITSUBISHI B — Body

Calibration

Brand: MITSUBISHI
Type: B — Body
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

  1. Retrieve freeze frame and all related DTCs. Confirm B2201 is current and note any U-/B-codes.
  2. Verify battery voltage >=12 V and good battery connections. Some modules enter sleep with low voltage.
  3. Check fuses and relays feeding the Traffic Master Module; restore any blown fuses and retest communication.
  4. With ignition ON, attempt communication with an OEM-level scan tool. Observe bus errors and whether the module responds.
  5. 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.
  6. 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.
  7. Measure CAN_H/CAN_L voltages with key ON and compare to expected ranges. Use an oscilloscope to confirm valid CAN frames if available.
  8. Verify termination resistance across CAN_H and CAN_L with key OFF. Investigate if resistance is out of expected range (open or shorted termination).
  9. Disconnect any aftermarket devices on the bus. Clear codes and re-scan to see if code returns.
  10. Reflash or update the Traffic Master Module software if a manufacturer service bulletin or update exists and scan tool indicates software mismatch.
  11. 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.
  12. 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

Fault status

⚠️ Status
No Communication With Traffic Master Module (lost communication on vehicle network)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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Keep it short and practical. Up to 500 characters.
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Code

B2201

Other B — Body

No Communication With Traffic MasterModule

Brand: Other
Type: B — Body
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

  1. Retrieve freeze frame and all related DTCs. Confirm B2201 is current and note any U-/B-codes.
  2. Verify battery voltage >=12 V and good battery connections. Some modules enter sleep with low voltage.
  3. Check fuses and relays feeding the Traffic Master Module; restore any blown fuses and retest communication.
  4. With ignition ON, attempt communication with an OEM-level scan tool. Observe bus errors and whether the module responds.
  5. 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.
  6. 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.
  7. Measure CAN_H/CAN_L voltages with key ON and compare to expected ranges. Use an oscilloscope to confirm valid CAN frames if available.
  8. Verify termination resistance across CAN_H and CAN_L with key OFF. Investigate if resistance is out of expected range (open or shorted termination).
  9. Disconnect any aftermarket devices on the bus. Clear codes and re-scan to see if code returns.
  10. Reflash or update the Traffic Master Module software if a manufacturer service bulletin or update exists and scan tool indicates software mismatch.
  11. 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.
  12. 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

Fault status

⚠️ Status
No Communication With Traffic Master Module (lost communication on vehicle network)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours
9,402

The library contains 9,402 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

ALFA ROMEO
89
AUDI
1,243
BMW
479
CADILLAC
206
CHEVROLET
456
CHRYSLER
193
DAEWOO
75
FIAT
26
GENESIS
207
HUMMER
138
HYUNDAI
371
ISUZU
86
KIA
128
LAND ROVER
320
LEXUS
280
LINCOLN
166
MERCEDES-BENZ
856
MERCURY
296
MITSUBISHI
406
PORSCHE
136
TESLA
58
TOYOTA
2,209
TRIUMPH
131
VOLKSWAGEN
626
VOLVO
221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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