Engine Coolant Temperature Sensor 2 Circuit High
Indicates a high reading from the engine coolant temperature sensor 2.
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What it means (plain English)
The computer is seeing the coolant temperature too high, typically above 215°F (102°C), which could mean that the engine is overheating or the sensor is malfunctioning.
What the computer is actually seeing
The PCM (Powertrain Control Module) is monitoring the voltage from coolant temperature sensor 2, which should normally fall within a range of 0.5V to 4.5V corresponding to temperatures from about -40°F to 257°F (-40°C to 125°C).
What a healthy reading looks like
The voltage from the sensor should be between 0.5V (cold) and 4.5V (hot), typically around 2.5V at 70°F (21°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.
- 1Check the coolant level. Ensure it is at the proper level before proceeding.
- 2Inspect the wiring and connector for the engine coolant temperature sensor 2. Look for frays, corrosion, or loose connections.
- 3Using a multimeter, measure the voltage at the connector for the coolant temperature sensor 2. Expected values should be between 0.5V and 4.5V.
- 4If voltage is out of range, check the sensor itself. Replace if needed. If voltage is normal, verify PCM operation.
Common causes
- Faulty coolant temperature sensor 2
- Wiring issues or connectors between the sensor and PCM
- Low coolant level
- Overheated engine condition
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It can be safe to drive short distances, but you should avoid high speeds or heavy loads to prevent overheating.
Will this code come back after repairs?
If the issue is fixed correctly, it should not come back. If a faulty sensor was replaced and connections checked, it shouldn’t reappear.
Why does this code appear with other coolant sensor codes?
Multiple codes might indicate a broader issue with the coolant temperature sensing system, including sensor failures or wiring problems.
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