P0119 - Engine Coolant Temperature Circuit Intermittent
The coolant temperature sensor signal is intermittent.
Treat the code as the starting point: compare symptoms, likely causes, and repair paths before pricing parts or moving into an estimate.
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
General difficulty estimate for the most common repair path.
Likely Repairs & Cost Guides
Use symptoms, scan data, and quick checks to confirm the likely repair path before pricing parts. The estimator helps compare repair paths before replacing anything unnecessarily.
Estimator-ready next step after the fault path is confirmed.
Related OBD Codes
Browse nearby code-family pages when the same fault pattern overlaps across systems, such as misfire, lean fuel trim, EVAP sealing, cooling, or charging faults.
Next Steps
Move from code lookup to diagnosis, then estimate the likely repair only after symptoms, causes, and checks point to the same path.