Engine Temperature Sensor
Engine temperature sensor circuit issue.
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What it means (plain English)
The engine temperature sensor is failing to send the right temperature info to the engine control module (ECM).
What the computer is actually seeing
The ECM sees an open or short circuit condition, meaning the temperature sensor is not reporting any data or is sending invalid data.
What a healthy reading looks like
The sensor should typically operate between 0.5 to 4.5 volts depending on temperature, with normal operational temp readings around 195°F (90°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.
- 11. Inspect the wiring and connectors leading to the engine temperature sensor for damage or corrosion. If damaged, repair or replace as needed.
- 22. Use a multimeter to check the voltage output of the engine temperature sensor. If voltage is outside the expected range (0.5-4.5V), replace the sensor.
- 33. Check for any stored codes in the ECM related to the engine temperature. If SPN 5593 appears along with other temperature-related codes, investigate further based on the specific codes.
Common causes
- Damaged wiring harness
- Faulty engine temperature sensor
- Corroded connector at the sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to avoid long drives until fixed, as overheating could occur.
Will this code come back after resetting?
If the underlying issue isn't addressed, yes, it'll likely return.
Why does this code appear with SPN 5592?
SPN 5592 relates to the same system, indicating a cascade of temperature sensor issues.
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