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Home / DTC / B2477 — Chassis No. not programmed

B2477 — Chassis No. not programmed

Detailed page for trouble code B2477.

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Code

B2477

MITSUBISHI B — Body

Chassis No. not programmed

Brand: MITSUBISHI
Type: B — Body
Views: UK: 15 EN: 32 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • New or replacement control module shipped without VIN programmed
  • Previous programming attempt failed or was interrupted (power loss during programming)
  • Module memory corruption or software fault
  • CAN bus/communication fault preventing module from receiving/storing VIN
  • Incorrect or incompatible module fitted for the vehicle
  • Aftermarket or rebuilt module lacking VIN data

Symptoms

  • DTC B2477 stored in body/control module(s)
  • VIN reported by scan tool differs from vehicle plate or is blank for that module
  • Immobilizer/watchdog or security-related warnings or lamp illumination
  • Module(s) may not communicate or report incomplete information on a scan tool
  • Possible no-start or restricted-start conditions if security systems rely on module VIN

What to check

  • Connect a full OEM-capable diagnostic tool and read all stored codes and module information
  • Compare VIN on vehicle compliance plate and vehicle documents to VIN reported by each module
  • Check module presence and response on the CAN bus (verify module ID and software part numbers)
  • Inspect CAN bus wiring, connectors and ground points for damage or corrosion
  • Verify battery voltage is stable (12.4–13.0 V) during diagnostics and programming attempts
  • Check service history for recent module replacement or programming attempts

Signal parameters

  • VIN string value stored in affected module (should match chassis plate)
  • CAN High/Low bus voltage and activity (idle ~2.5 V differential behavior)
  • Module power/ground voltages during key-on and programming attempts
  • Module COMM status/response time to diagnostic requests
  • Immobilizer transponder ID and key registration status (if applicable)
  • Module software/firmware version and calibration IDs

Diagnostic algorithm

  1. Record all DTCs from all modules with an OEM-capable diagnostic tool and note which module reported B2477.
  2. Visually verify the vehicle VIN (dash plate, door jamb, title) and document the expected VIN.
  3. Using the diagnostic tool, read the VIN stored in the affected module(s). Confirm blank, incorrect, or missing VIN entry.
  4. Check vehicle power and CAN bus: verify battery voltage, inspect related fuses, grounds and connectors, and confirm CAN communication to other modules.
  5. If communication fault exists, repair wiring/connectors and clear codes. Re-check VIN storage after restoring bus communication.
  6. If wiring and communication are normal but VIN is absent or incorrect, determine if the module was recently replaced or is aftermarket/rebuilt.
  7. Reprogram or write the correct chassis number to the module using manufacturer-approved programming equipment and procedures. Ensure battery is maintained at recommended voltage during programming.
  8. After programming, clear codes and perform a full module scan to confirm VIN consistency across modules and that B2477 does not return.
  9. If programming fails or module does not accept VIN, replace the module with a proper OEM part and program as required, or consult dealer technical support for module-specific procedures.
  10. Re-test vehicle functions related to immobilizer/security and road-test as required.

Likely causes

  • Replacement body/BCM/ECU not reprogrammed with VIN
  • Programming interrupted due to low battery or power loss
  • Module software mismatch or corrupted calibration data
  • Open/short or intermittent fault on CAN/vehicle bus preventing VIN write/read
  • Unauthorized or non-OEM module installed lacking VIN programming capability

Fault status

⚠️ Status
Chassis number (VIN) not programmed in module; VIN must be written/programmed or communication fault repaired.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5 - 4.0 hours

Similar codes

B2476 B2478 U0100 U0121 U0401
406

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

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