Engine Coolant Temperature Sensor 2
Indicates the status of the secondary engine coolant temperature sensor.
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What it means (plain English)
The engine has two sensors that measure coolant temperature; this code triggers when the second one shows unusual readings, which can affect engine performance.
What the computer is actually seeing
The PCM compares signals from two coolant temperature sensors. If sensor 2 reports a temperature significantly higher or lower than sensor 1 (usually more than 10-15 degrees Fahrenheit difference), the code sets.
What a healthy reading looks like
Normal operation ranges between 190°F to 220°F. The value from sensor 2 should closely match sensor 1 within a 10°F range.
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 wiring and connectors to sensor 2 for corrosion or damage.
- 2Inspect coolant level; ensure it is within the proper operating range.
- 3Use a scan tool to compare the readings of both coolant temperature sensors.
Common causes
- Faulty engine coolant temperature sensor 2
- Wiring issues or connector problems at the sensor
- Low coolant level affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you may notice reduced performance or fuel efficiency. Fix it soon.
Will this code come back after clearing?
It can if the underlying issue isn't resolved; monitor closely after repairs.
Why does this code appear with other codes?
Related codes often point to problems within the same system, like temperature sensors or coolant issues.
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