TorqueMech OBD Code Guide
P0115 - Engine Coolant Temperature Circuit Malfunction
Problem detected in ECT sensor circuit.
Code first. Confirm symptoms and checks before pricing parts.
Read code pattern
Check likely system
Estimate after confirmation
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Common Next Steps
Turn the code into the next check.
Pressure test cooling system
Confirm external leaks, cap behavior, and pressure loss before parts.
Inspect thermostat
Compare warm-up, scan temperature, and hose temperature behavior.
Verify radiator fan operation
Check fan command, AC-load response, fuses, relays, and airflow.
Related Inspection
Code Overview
Problem detected in ECT sensor circuit.
Common Causes
- ECT sensor failed
- Wiring/connectors issue
- Low coolant/air pockets (can skew readings)
Diagnostic Steps
- Compare ECT to ambient when cold
- Inspect connector for coolant intrusion
- Bleed cooling system if needed
Related OBD Codes
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Next Steps
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