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Home / DTC / B2402 — STL.unit comm.(system ID)

B2402 — STL.unit comm.(system ID)

Detailed page for trouble code B2402.

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22,491specific
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Code

B2402

MITSUBISHI B — Body

STL.unit comm.(system ID)

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or unprogrammed STL control unit (module)
  • Damaged wiring or poor connector(s) between STL unit and vehicle network
  • CAN/LIN bus fault or short (high/low differential problems)
  • Low battery or intermittent power/ground to the STL unit
  • Software/version or system ID mismatch after module replacement
  • Other module on the network causing communication collisions or bus errors

Symptoms

  • Related function controlled by the STL unit does not operate or is disabled
  • A corresponding warning lamp or message appears on the dash
  • Stored B2402 (and possibly other communication DTCs) in the memory
  • Intermittent operation of affected system(s)
  • No response from STL unit when queried with a scan tool

What to check

  • Read and record all stored DTCs and freeze frame data with an appropriate scan tool
  • Check for other communication DTCs (U- or B-codes) that indicate a bus-wide issue
  • Visually inspect connectors and wiring at the STL unit and along the bus for damage, corrosion, or loose pins
  • Measure battery voltage and check for stable power and good chassis/engine ground
  • Attempt to communicate with the STL unit using a diagnostic tool; note whether the unit responds and what System ID it reports
  • Check CAN/LIN bus voltages (idle voltages and differential) and look for shorts to battery or ground

Signal parameters

  • Battery supply voltage to STL unit (approx. 12 V nominal)
  • Ground continuity to chassis ground
  • CAN High / CAN Low voltages (idle ~2.5 V each, differential ~2.5 V) or LIN signal levels if applicable
  • Presence of periodic CAN frames from STL unit (module ID and message frequency)
  • Error counters / node off indication from scan tool
  • Wake-up line or sleep/wake signals if used by STL unit

Diagnostic algorithm

  1. Connect manufacturer-level scan tool and record DTCs and system info; attempt to communicate with the STL unit and read its System ID
  2. Check for related network DTCs (Uxxxx). If multiple modules show comms faults, isolate bus problem first
  3. Visually inspect STL unit connector and wiring harness; repair any corrosion, pushed-out pins, chafing, or obvious damage
  4. Verify battery voltage at the STL connector and check continuity to ground. Repair any power/ground faults
  5. Measure CAN/LIN bus signals at the STL connector with a DMM/oscilloscope; look for correct idle voltages and clean waveform. Repair shorts/opens as found
  6. If wiring and power/ground are good but the module does not respond or reports an incorrect system ID, confirm part number and whether the module requires programming/coding. Reprogram/correct ID per service manual if applicable
  7. After repairs or module replacement, clear codes and perform functional test; monitor for reappearance. If intermittent, perform wiggle tests and road test while monitoring live data
  8. If unable to resolve, consult manufacturer service literature for module-specific troubleshooting, wiring diagrams, and known software updates or technical service bulletins

Likely causes

  • Loose/damaged connector at STL unit (corrosion/pin push-out)
  • Power or ground fault to the STL unit
  • CAN/LIN wiring short or open between STL and ECU network
  • Module replacement without correct coding/programming causing system ID mismatch

Fault status

⚠️ Status
Communication error with STL unit (system ID mismatch or no response). Check module, wiring, power/ground, and network integrity.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B2400 B2401 B2403 U0100 U0121 U0073
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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Code

B2402

Other B — Body

Audio CD/DJ Thermal Shutdown Fault

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or unprogrammed STL control unit (module)
  • Damaged wiring or poor connector(s) between STL unit and vehicle network
  • CAN/LIN bus fault or short (high/low differential problems)
  • Low battery or intermittent power/ground to the STL unit
  • Software/version or system ID mismatch after module replacement
  • Other module on the network causing communication collisions or bus errors

Symptoms

  • Related function controlled by the STL unit does not operate or is disabled
  • A corresponding warning lamp or message appears on the dash
  • Stored B2402 (and possibly other communication DTCs) in the memory
  • Intermittent operation of affected system(s)
  • No response from STL unit when queried with a scan tool

What to check

  • Read and record all stored DTCs and freeze frame data with an appropriate scan tool
  • Check for other communication DTCs (U- or B-codes) that indicate a bus-wide issue
  • Visually inspect connectors and wiring at the STL unit and along the bus for damage, corrosion, or loose pins
  • Measure battery voltage and check for stable power and good chassis/engine ground
  • Attempt to communicate with the STL unit using a diagnostic tool; note whether the unit responds and what System ID it reports
  • Check CAN/LIN bus voltages (idle voltages and differential) and look for shorts to battery or ground

Signal parameters

  • Battery supply voltage to STL unit (approx. 12 V nominal)
  • Ground continuity to chassis ground
  • CAN High / CAN Low voltages (idle ~2.5 V each, differential ~2.5 V) or LIN signal levels if applicable
  • Presence of periodic CAN frames from STL unit (module ID and message frequency)
  • Error counters / node off indication from scan tool
  • Wake-up line or sleep/wake signals if used by STL unit

Diagnostic algorithm

  1. Connect manufacturer-level scan tool and record DTCs and system info; attempt to communicate with the STL unit and read its System ID
  2. Check for related network DTCs (Uxxxx). If multiple modules show comms faults, isolate bus problem first
  3. Visually inspect STL unit connector and wiring harness; repair any corrosion, pushed-out pins, chafing, or obvious damage
  4. Verify battery voltage at the STL connector and check continuity to ground. Repair any power/ground faults
  5. Measure CAN/LIN bus signals at the STL connector with a DMM/oscilloscope; look for correct idle voltages and clean waveform. Repair shorts/opens as found
  6. If wiring and power/ground are good but the module does not respond or reports an incorrect system ID, confirm part number and whether the module requires programming/coding. Reprogram/correct ID per service manual if applicable
  7. After repairs or module replacement, clear codes and perform functional test; monitor for reappearance. If intermittent, perform wiggle tests and road test while monitoring live data
  8. If unable to resolve, consult manufacturer service literature for module-specific troubleshooting, wiring diagrams, and known software updates or technical service bulletins

Likely causes

  • Loose/damaged connector at STL unit (corrosion/pin push-out)
  • Power or ground fault to the STL unit
  • CAN/LIN wiring short or open between STL and ECU network
  • Module replacement without correct coding/programming causing system ID mismatch

Fault status

⚠️ Status
Communication error with STL unit (system ID mismatch or no response). Check module, wiring, power/ground, and network integrity.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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B2400 B2401 B2403 U0100 U0121 U0073
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