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Home / DTC / B29F0 — Sequence error:invalid state

B29F0 — Sequence error:invalid state

Detailed page for trouble code B29F0.

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Code

B29F0

MITSUBISHI B — Body

Sequence error:invalid state

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

Causes

  • Module software/firmware bug or corrupted calibration data
  • Interrupted power or abnormal ignition cycle during module initialization
  • Loss or corruption of CAN/LIN communication messages required for sequence
  • Incorrect or incomplete module replacement/configuration (mismatched part or VIN programming)
  • Faulty wiring, poor connector/ground causing intermittent signals
  • Failed or intermittent sensor or actuator that blocks the expected sequence

Symptoms

  • Related function(s) inoperative or stuck in a default/limp state
  • One or more warning or indicator lights illuminated
  • DTC stored and may reappear after clearing
  • Vehicle may require specific key cycles or diagnostics to reproduce
  • Erratic or intermittent operation of the affected system

What to check

  • Read and record all stored DTCs and freeze-frame data from all modules; note any related U- or B-codes
  • Check battery voltage and charging system; ensure stable voltage during key-on and cranking
  • Perform key cycle and attempt to reproduce the failure while monitoring live data
  • Inspect connectors, pins, and grounds at the module and related sensors/actuators for corrosion, looseness, or damage
  • Check CAN/LIN bus for communication errors (use scope or network diagnostic tool) and verify message presence and frequency
  • Verify module part number and software/calibration version against factory specification

Signal parameters

  • Battery voltage (V) at module during key ON and cranking
  • CAN/LIN bus voltage and physical layer integrity
  • Presence and frequency of expected CAN IDs (messages/sec) related to the system
  • Module status/state bitfield or sequence counter from live data
  • Ignition/run/ACC input state and sleep/wake signals
  • Inputs from relevant sensors (e.g., position, speed, temperature) shown as expected ranges

Diagnostic algorithm

  1. Connect a capable scan tool and retrieve all DTCs and freeze frame data from every control module. Note any related communication (U) codes.
  2. Attempt to reproduce the fault while monitoring live data and the module's reported state transitions. Record the exact conditions when the code sets.
  3. Verify battery condition and measure voltage stability during the reproduction attempt. Recharge or replace battery if voltage is low or unstable.
  4. Visually inspect and wiggle-test wiring, connectors, and grounds for the affected module and associated sensors/actuators. Repair any damaged connectors or wiring.
  5. Check the CAN/LIN bus for message integrity using a scan tool or scope: verify expected message IDs, timings, and no bus errors. Repair bus faults before further testing.
  6. Confirm the module has correct part number and software/calibration level for the vehicle; if mismatched or outdated, follow factory reprogramming/update procedure.
  7. If the module was recently replaced or reconfigured, verify correct coding and that any required initialization/relearn procedures have been completed.
  8. If all wiring and communications are good and software is current, attempt module reflash/reprogram per manufacturer instructions. Clear codes and retest.
  9. If the fault persists after software update and wiring/communication checks, consider module bench-testing or replacement as a last step. Keep replacement part configuration and programming in accordance with factory procedures.
  10. After repairs, clear codes, perform the required relearns/initializations, and verify the issue does not return in normal operating conditions.

Likely causes

  • CAN/LIN bus communication errors preventing required messages (high probability)
  • Module did not complete initialization due to low battery or ignition cycling (medium probability)
  • Software/firmware mismatch or need for reprogramming after replacement (medium probability)
  • Intermittent connector/ground issue affecting state inputs (lower probability)

Fault status

⚠️ Status
Sequence error — module reports invalid or unexpected state (requires communication, wiring, or software check).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

B29F1 B29F2 U0100 U0121 P0600
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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