Coolant Temperature Sensor 2 - Out of Range
The coolant temperature sensor 2 is reading a value that's outside of the expected 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 coolant temperature sensor is sending signals that don’t match what the engine control unit (ECU) expects. For example, if the sensor is reading a temperature of -40°F or over 250°F, it’s likely malfunctioning or has wiring issues.
What the computer is actually seeing
The ECU expects the coolant temperature to be between approximately 160°F to 220°F during normal operation. If it receives a reading of less than -40°F or more than 250°F, it triggers this fault code.
What a healthy reading looks like
The expected coolant temperature values should be within 160°F to 220°F (70°C to 105°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 in the reservoir; it should be within the marked range.
- 2Inspect the wiring and connectors to the coolant temperature sensor for damage or corrosion; repair if needed.
- 3Using a multimeter, test the resistance of the coolant temperature sensor at various temperatures to see if it falls within normal range. Expected resistance at 68°F (20°C) should be around 2.5k ohms.
- 4If the sensor is out of range, it should be replaced. If readings are normal, check for faults in the ECU or wiring harness.
Common causes
- Faulty coolant temperature sensor 2
- Open or shorted wiring to the coolant temperature sensor
- Poor connection at the sensor connector
- Corrosion or damage to the wiring harness
- Low coolant level affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, it's generally safe but needs timely attention as it can lead to poor engine performance.
Will this issue come back after repair?
If properly repaired, it shouldn't return unless there's an underlying issue.
Why does this code appear with other codes?
Multiple codes can indicate broader system malfunctions, especially related to cooling or sensor issues.
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 →