Engine Temperature Sensor Out of Range
Indicates the engine temperature sensor is reading outside of acceptable limits.
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What it means (plain English)
The engine temperature sensor reports the engine's coolant temperature. When it shows unusually high or low temperatures that don't match actual conditions, it could signal an issue. For example, a valid reading should be around 180°F to 220°F during normal operation, so if it shows below 140°F or above 260°F, that's a problem.
What the computer is actually seeing
The computer monitors the engine temperature sensor's input voltage, expecting a typical range of 0.5V to 4.5V corresponding with a temperature range of 140°F to 260°F. If this input is outside those parameters, the computer records a fault.
What a healthy reading looks like
Expected voltage from the temp sensor is 0.5V (140°F) to 4.5V (260°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 the engine coolant level; ensure it's at the proper level. If low, top it off and retest the system.
- 22. Inspect the wiring and connector at the engine temperature sensor for damage or corrosion. A visual inspection should reveal any obvious issues.
- 33. Using a multimeter, check the voltage output from the temperature sensor while the engine is running. Expected range is 0.5V to 4.5V. If it's outside this range, the sensor is likely faulty.
- 44. If the sensor voltage is within range, connect a scanner and check for any additional codes or data related to engine temperature readings.
- 55. If the sensor is confirmed faulty based on voltage readings, replace the engine temperature sensor and clear the fault codes.
Common causes
- Faulty engine temperature sensor
- Wiring issues or poor connections at the sensor
- Coolant leaks or low coolant level
- Faulty engine control module (ECM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with SPN 1983 active?
No, it's not safe. This code indicates potential overheating, which can damage the engine.
Will this code come back after clearing it?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why does SPN 1983 pair with other SPNs?
These other codes may also indicate temperature-related or sensor issues that can affect engine performance.
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