Engine Temperature Sensor Circuit Low
This code indicates the engine's temperature sensor circuit is reading low.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine temperature sensor is designed to monitor the coolant temperature, typically around 190-220°F (88-105°C) when the engine is at normal operating temperature. A reading below 160°F (71°C) may trigger this code, suggesting an issue with the sensor or wiring.
What the computer is actually seeing
The engine control module (ECM) monitors the voltage from the engine temperature sensor. A typical sensor should output between 0.5V (cold) and 4.5V (hot). If the voltage falls below around 0.3V, it triggers this code.
What a healthy reading looks like
Expect the engine temperature sensor to output between 0.5V and 4.5V under normal conditions, correlating to coolant temperatures from about 160°F to 240°F (71°C to 116°C).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect wiring and connectors for damage or corrosion.
- 2Check coolant level and top off if low.
- 3Use a multimeter to test the engine temperature sensor output; should be between 0.5V and 4.5V.
- 4If sensor output is low (below 0.3V), replace the sensor. If normal, check ECM for faults.
Common causes
- Faulty engine temperature sensor
- Shorted or open wiring
- Corroded connectors
- Low coolant levels
- ECM software issue
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but fix it soon. Engine may run poorly or overheat.
Will this code come back after fixing?
If all issues are resolved, the code should not return.
Why does this code appear with other codes?
It often indicates an underlying temperature sensor issue affecting multiple systems.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →