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Home / DTC / P1231 — ASC data plausibility

P1231 — ASC data plausibility

Detailed page for trouble code P1231.

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P1231

MITSUBISHI P — Powertrain

ASC data plausibility

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty ASC sensor (accel, yaw, or steering-angle depending on system)
  • Intermittent or damaged wiring/connector to ASC sensor or module
  • Poor power supply or ground to ASC/related modules
  • CAN bus communication errors or module not responding
  • Incorrect or missing sensor calibration or alignment
  • Software mismatch or ECU/module firmware issue

Symptoms

  • ASC / traction control warning lamp illuminated
  • Reduced or disabled stability/traction control
  • ABS or stability-related warnings on instrument cluster
  • Intermittent or permanent limp-home or reduced-engine-power behavior in some vehicles
  • Erratic vehicle stability intervention (unexpected braking/torque cut)
  • Stored faults in related modules (ABS, ECM, BCM)

What to check

  • Read freeze-frame and full DTC list from ASC, ABS, ECM and gateway modules
  • Check for related DTCs on ABS/ESP and CAN communication codes
  • Visual inspection of ASC sensor/module connectors, wiring and grounds
  • Check battery voltage and charging system at key-on and engine running
  • Confirm module software/part number and calibration status
  • Perform wiggle test while monitoring live data for intermittent changes

Signal parameters

  • ASC sensor voltage (typical 0.1–4.9 V depending on sensor type) and signal range
  • Accelerometer outputs (X/Y/Z) in g or m/s²
  • Yaw rate sensor output (deg/s or V)
  • Steering angle sensor value (degrees) and offset
  • Wheel speed sensor frequencies (Hz) for all wheels
  • CAN bus message presence and error counters (rx/tx frames, bus errors)

Diagnostic algorithm

  1. Retrieve DTCs and freeze-frame data from ASC, ABS, ECM and gateway. Note time stamps and driving conditions.
  2. Check for other stored codes (especially CAN, ABS, wheel speed, steering angle) that could explain implausible data.
  3. Visually inspect ASC sensor(s), connectors and wiring for damage, corrosion, or loose pins; repair as needed.
  4. With a scan tool, monitor live ASC-related data (accelerations, yaw, steering angle, wheel speeds) and compare against expected behavior while performing controlled movements.
  5. Measure sensor supply and ground at the ASC module connector with key on; verify voltage within specification and good ground continuity.
  6. Perform wiggle test on harness and connectors while watching live data for intermittent faults; repair broken wiring or poor contacts.
  7. Check CAN bus health: verify other modules respond, check for error counters and proper termination. Repair communication faults.
  8. If sensor outputs are out-of-range or absent, bench-test or replace the suspect sensor and re-check. If replaced, perform required calibrations (steering angle, sensor zeroing, module setup).
  9. Update module software/calibration if manufacturer released service bulletin or update addressing plausibility checks.
  10. After repairs, clear codes and test drive to confirm the DTC does not return and that ASC/ESP functions normally.

Likely causes

  • Damaged sensor harness (chafing, corrosion, broken wires)
  • Contaminated or corroded connector pins at sensor or module
  • Low battery voltage or weak charging system causing erratic readings
  • Failed ASC sensor element (stiction, internal short)
  • Loss of CAN/communication frames between ASC and engine/ABS module
  • Module configuration error after replacement (no calibration)

Fault status

⚠️ Status
Manufacturer-specific DTC: ASC data plausibility — ASC sensor/module reported data that failed plausibility/consistency checks or lost communication.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P1230 P1232 C1231 C1256 U0100
406

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