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Home / DTC / B2255 — ECU(Roll over feature disable)

B2255 — ECU(Roll over feature disable)

Detailed page for trouble code B2255.

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Code

B2255

MITSUBISHI B — Body

ECU(Roll over feature disable)

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

Causes

  • Fault or internal error in the airbag/SRS ECU (restraint control module).
  • Faulty or intermittent roll/tilt sensor (roll‑over sensor) or its connectors.
  • Damaged wiring, corroded connector, or poor ground to the sensor or ECU.
  • Loss of or corrupted communication between sensor and ECU (CAN/LIN).
  • Low or unstable battery/vehicle voltage during self‑test.
  • Previous deployment, impact damage or improper repair leaving the system disabled.

Symptoms

  • SRS/Airbag warning lamp illuminated or flashing.
  • A message or indicator stating 'Roll over feature disabled' on the dash (model dependent).
  • Possible disablement of associated safety functions (rollover mitigation, advanced airbag timing).
  • Loss of related vehicle stability/traction interventions if integrated with rollover control.

What to check

  • Scan SRS/airbag module with a factory or capable OEM scan tool; capture all related DTCs and freeze frame data.
  • Verify battery voltage is stable (12.4–14.7 V) and charge if low; recheck codes after charge.
  • Visually inspect roll‑over sensor, harness, and connectors for damage, corrosion, or disconnection.
  • Check fuses and power/ground circuits for the SRS/rollover sensor circuit.
  • Check CAN/LIN bus continuity and communication to the SRS ECU (look for CAN errors or lost comms codes).
  • Check for recent impact damage or evidence of prior airbag deployment and non‑OEM repairs.

Signal parameters

  • Sensor supply/reference voltage: typically 5 V reference from SRS ECU (verify with OEM spec).
  • Signal output: analog 0–5 V range or digital/CAN message depending on sensor type (check OEM diagnostic manual).
  • Sensor ground: near 0 ohm to chassis; measure for high resistance if fault suspected.
  • CAN bus: normal idle voltage ~2.5 V per line (verify differential communication with scan tool).
  • Expected behavior: sensor self‑test passed and valid roll/tilt data visible via OEM scan tool.

Diagnostic algorithm

  1. Read all stored DTCs and freeze frame data using a capable OEM or SRS‑capable scan tool. Note any other SRS or communication codes.
  2. Verify battery voltage and charging system; charge battery or maintain proper voltage during testing.
  3. Clear codes and attempt to reproduce; if B2255 returns, proceed to inspect wiring and connectors.
  4. Visually inspect roll‑over sensor location and connector for damage, corrosion, water intrusion, or loose pins. Repair as needed.
  5. Backprobe sensor connector: confirm reference voltage, ground continuity, and signal output while monitoring with OEM tool/oscilloscope. Compare to manufacturer limits.
  6. Check SRS ECU power and ground circuits and related fuses/relays. Repair any power/ground issues.
  7. Use diagnostic tool to monitor roll/tilt sensor values and CAN/LIN communication; if no data or invalid data, isolate wiring or replace sensor.
  8. If wiring and sensor are good but the ECU flags remain, check for ECU software updates or stored disable flags. Reprogram or replace SRS ECU per manufacturer procedure.
  9. After repairs, clear codes and perform full SRS system checks and self‑tests. Confirm roll‑over detection is enabled and no related warnings remain.
  10. If repairs require airbag module replacement or ECU replacement, follow safety procedures (battery disconnect, static precautions) and perform required seat belt/airbag system initialization and calibration per OEM.

Likely causes

  • Bad roll‑over sensor (open/short or out‑of‑range output).
  • Loose or pushed‑out connector at the sensor or restraint ECU.
  • Chassis or ECU ground degraded (high resistance).
  • CAN bus wiring fault between chassis sensors and SRS ECU.
  • Blown fuse supplying SRS or sensor reference voltage.
  • ECU software flag set (stored disable/limp mode) requiring dealer reprogramming.

Fault status

⚠️ Status
Roll‑over detection function disabled by restraint ECU. The ECU has detected a fault or condition preventing normal roll‑over sensing and has disabled the feature; SRS warning may be displayed.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2250 B2251 B2256 B2220 U0121 U0422
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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