P0119 - Engine Coolant Temperature Circuit Intermittent
The coolant temperature sensor signal is intermittent.
Code first. Confirm symptoms and checks before pricing parts.
Explore Related Systems
Compare nearby repair families.
Common Next Steps
Turn the code into the next check.
Confirm external leaks, cap behavior, and pressure loss before parts.
Compare warm-up, scan temperature, and hose temperature behavior.
Check fan command, AC-load response, fuses, relays, and airflow.
Related Inspection
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
Confirm the repair path before pricing parts.
Estimator-ready next step after the fault path is confirmed.
Related OBD Codes
Browse nearby codes when systems overlap.
Next Steps
Move from code to checks, then estimate.