What this code means

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

Symptoms

• Check Engine Light
• Intermittent cooling fan operation
• Incorrect temperature gauge readings
• Erratic idle

Common causes

• Intermittent short in ECT sensor wiring
• Faulty ECT sensor
• Corroded connector
• Water intrusion

Diagnostic steps

1. Monitor ECT readings for erratic behavior
2. Wiggle test ECT connector
3. Test sensor resistance
4. Inspect wiring for shorts

Repair notes

Replace ECT sensor or repair wiring as needed.

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