Engine Temperature Sensor 2 - Below Normal Operating Temperature
This code indicates that the second temperature sensor is reading below the expected temperature range.
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 second engine temperature sensor is showing a lower temperature than it should, usually meaning the engine isn't heating up properly or there’s a problem with the sensor or its wiring.
What the computer is actually seeing
The engine control module (ECM) is getting a signal from the second temperature sensor that reads less than the expected normal range during engine operation, typically below 80°C (176°F).
What a healthy reading looks like
Normal operating range for engine temperature sensors is between 80°C to 110°C (176°F to 230°F).
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.
- 11. Check engine coolant level - Ensure it's within normal range. If low, top up and check for leaks.
- 22. Inspect the wiring and connector to the engine temperature sensor 2 - Look for any visible damage or corrosion.
- 33. Using a multimeter, check the resistance of the engine temperature sensor 2 - Should read between 2.5k ohm to 3.5k ohm at room temperature (20°C or 68°F). If out of range, replace the sensor.
- 44. Check the thermostat operation - Run the engine and observe if it reaches normal operating temperature. If it stays low, the thermostat may be stuck open.
Common causes
- Faulty engine temperature sensor 2
- Wiring issue or poor connector
- Low engine coolant level
- Thermostat stuck open or failed
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but you'll want to address it soon to avoid overheating or performance issues.
Will this code come back after clearing it?
If the underlying issue isn't resolved, yes, it will likely return after a drive cycle.
Why does this code pair with SPN 2652?
Both codes relate to engine temperature sensors. They often register issues independently but can occur together if there's a sensor fault.
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 →