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2014 MITSUBISHI OUTLANDER
2.4L I4•FWD•CVT•gas
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor489Torque776Fluid7DTC1848Battery1Maintenance0Recalls4
P1791moderate severityPowertrain

Engine Coolant Temperature Signal (from ECM) Malfunction

on 2014 Mitsubishi Outlander 2.4L I4 · FWD

What this code means

The TCM received a bad or missing coolant temperature signal from the ECM. This affects temperature-based shift strategy.

Symptoms

  • Abnormal shifting
  • Check engine light
  • Transmission fault indicator

Common causes

  • Faulty coolant temperature sensor
  • Damaged ECM/TCM wiring
  • Communication fault
  • Faulty ECM

Diagnostic steps

  1. Scan ECM and TCM for codes
  2. Check coolant temperature sensor reading
  3. Inspect wiring between modules
  4. Verify ECM signal output
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