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2014 CADILLAC ATS

2.0L Turbo I4•RWD•AUTOMATIC•gas•turbo
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor566Torque4710Fluid7DTC955Battery0Maintenance0Recalls4
P1115moderate severityPowertrain

ECT Sensor Circuit Intermittent High Voltage

on 2014 Cadillac ATS 2.0L Turbo I4 · RWD

What this code means

The PCM detected intermittent high voltage on the Engine Coolant Temperature sensor circuit, indicating the sensor is sporadically reporting very low temperatures.

Symptoms

  • Check Engine Light
  • Rich running condition
  • Poor fuel economy
  • Cooling fans not activating when needed

Common causes

  • Intermittent open in ECT circuit
  • Loose ECT connector
  • Faulty ECT sensor
  • Corroded terminals

Diagnostic steps

  1. Monitor ECT readings for erratic spikes
  2. Wiggle test ECT connector
  3. Test sensor resistance across temperature range
  4. Check connector terminals

Repair notes

Clean and secure ECT connector. Replace sensor if faulty.

Other Powertrain codes on this vehicle

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