Incorrect Engine Temperature Signal
The engine control unit is receiving an unexpected temperature reading.
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What it means (plain English)
The engine temperature sensor is telling the computer something's off—like the engine is way too hot or way too cold when it's not supposed to be.
What the computer is actually seeing
The engine control unit (ECU) is getting inputs from the engine temperature sensor, typically ranging between 180°F to 220°F (82°C to 104°C) during normal operation. If it sees values outside this range or fluctuating rapidly, it triggers this fault code.
What a healthy reading looks like
Normal engine temperature readings should be between 180°F (82°C) and 220°F (104°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 engine coolant level. Should be between the min and max marks on the reservoir. If low, add coolant and see if code reappears.
- 2Inspect wiring and connector for the engine temperature sensor for frays, corrosion, or loose connections. Repair as needed.
- 3Using a scan tool, monitor the live data for the engine temperature. Compare the reading to an infrared thermometer aimed at the engine block.
- 4If the readings from the scan tool and the thermometer don’t match, replace the engine temperature sensor.
- 5If the sensor reading seems correct, check for a stuck thermostat by feeling the upper radiator hose. It should get hot shortly after the engine reaches operating temperature.
Common causes
- Faulty engine temperature sensor
- Wiring issues in the temperature sensor circuit
- Thermostat malfunction
- Coolant levels low or incorrect
- Bad connections at the ECU or sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It’s best to limit driving until you resolve the issue. Incorrect temperature readings might lead to overheating and engine damage.
Can this code come back after repairs?
Yes, if the underlying issue—like poor connections or a faulty sensor—wasn't fully resolved, it may return.
Why does this code sometimes pair with SPN 614?
SPN 614 indicates a coolant temperature sensor issue, which is related to overall engine temperature reading and can trigger both codes.
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