P0119 - Engine Coolant Temperature Circuit Intermittent
The coolant temperature sensor signal is intermittent.
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Code Overview
The coolant temperature sensor signal is intermittent.
Common Causes
- Loose coolant temperature sensor connector
- Failing ECT sensor dropping in and out
- Broken or chafed wiring in the ECT circuit
- Coolant intrusion or corrosion in the connector
Symptoms
- Temperature gauge or scan data jumps around
- Cooling fans may cycle oddly
- Intermittent rich or lean cold-start behavior
Diagnostic Steps
- Wiggle-test the ECT connector and harness while watching scan data
- Inspect the connector for corrosion or coolant intrusion
- Check reference voltage, ground, and signal integrity at the sensor
- Compare ECT behavior to actual engine temperature during warm-up
Repair Difficulty
Easy
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