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Home / DTC / C1396 — Engine torque input refusal

C1396 — Engine torque input refusal

Detailed page for trouble code C1396.

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C1396

MITSUBISHI C — Chassis

Engine torque input refusal

Brand: MITSUBISHI
Type: C — Chassis
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Page language: EN

Causes

  • Loss of CAN communication between engine ECU and ABS/TCU
  • Throttle actuator or electronic throttle control (ETC) fault
  • Accelerator pedal position sensor fault or mismatch
  • ECU software or calibration mismatch
  • Low battery/poor power or ground to control modules
  • Wiring harness damage, poor connectors or corrosion

Symptoms

  • VDC/ABS/TRAC warning lamp illuminated
  • Check Engine or MIL may also be present
  • Reduced engine power or limp-home mode
  • Loss of traction control or stability assist functions
  • Intermittent or permanent driveability issues (hesitation, surging)
  • Possible stored communication or CAN bus error codes

What to check

  • Read all stored codes and freeze-frame data from ABS/TCU and engine ECM
  • Check battery voltage and known good ground points
  • Scan CAN bus for U-codes or communication errors (U0100, U0073, etc.)
  • Inspect connectors and wiring between ECM and ABS/TCU for corrosion, damage, or loose pins
  • Monitor live data: engine torque request vs actual torque, throttle position, pedal position, RPM
  • Perform visual inspection of throttle body and accelerator pedal assembly

Signal parameters

  • Engine torque request (Nm or %)
  • Calculated/actual engine torque (Nm)
  • Engine speed (RPM)
  • Throttle position (%) and throttle actuator target/position
  • Accelerator pedal position sensor(s) (%)
  • CAN bus messages/status (ECM to ABS/TCU)

Diagnostic algorithm

  1. Retrieve full DTC list from all modules (ECM, ABS, TCU) and note freeze frame and occurrence history.
  2. Verify battery voltage >12.2V and good chassis/body grounds. Repair any low-voltage or ground issues first.
  3. Clear codes and attempt to reproduce the fault while monitoring live data: torque request vs actual torque, RPM, throttle and pedal positions, and CAN health.
  4. If communication U-codes present, inspect CAN wiring and connectors between ECM and ABS/TCU. Repair any damaged wiring or corroded connectors.
  5. Test accelerator pedal sensors for correct and matching output values and plausible behavior (no jumps, consistent returns to rest). Replace pedal assembly if faulty.
  6. Test throttle body actuator: command open/close with a scan tool, verify actuator follows commands and reports position. Clean or replace throttle body as required.
  7. Investigate engine drivability faults that would prevent torque delivery (misfires, fuel pressure, ignition). Repair underlying engine faults and retest.
  8. If module replacement or software update is suspected, verify correct ECU calibration and reflash or replace modules following manufacturer procedures.
  9. After repairs, clear codes and perform a road test under the conditions that produced the fault to confirm repair.
  10. If intermittent, consider extended monitoring or installing data logger to capture event.

Likely causes

  • Faulty or intermittent CAN wiring/connector between ECM and ABS/TCU
  • Defective throttle body (stuck or not following commands)
  • Failed accelerator pedal position sensor or out-of-range signal
  • Battery/ground problems causing module resets or communication errors
  • ECU software error or recent module replacement with incompatible calibration

Fault status

⚠️ Status
Engine torque input refusal — stability/traction module detected that the engine/ECM is not providing or accepting the expected torque input or communication, causing limited control functionality.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4 hours

Similar codes

C1395 C1397 U0100 U0073 P2138 P2106
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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