Temperature Sensor 1 - High Temperature
The temperature sensor is reporting a higher than normal reading.
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What it means (plain English)
The engine control module (ECM) is getting a temperature signal from the sensor that exceeds the expected range, indicating possible overheating or a faulty sensor.
What the computer is actually seeing
The ECM sees a signal from the temperature sensor above 250°F (121°C) continuously for more than 5 seconds, indicating a fault.
What a healthy reading looks like
Normal operating temperature values for most systems should be between 160°F (71°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.
- 11. Check the engine coolant level; it should be between the 'min' and 'max' marks on the reservoir. If low, fill it up and recheck the code.
- 22. Inspect the wiring and connectors of the temperature sensor for damage, corrosion, or loose connections. Repair as needed.
- 33. Use a digital multimeter to check the voltage at the temperature sensor connector. You should see around 0.5V to 4.5V depending on temperature. If it's out of this range, replace the sensor.
- 44. Check the actual engine temperature with an infrared thermometer to confirm if it matches the sensor reading. If there is a significant difference, replace the sensor.
Common causes
- Faulty temperature sensor
- Wiring issues or shorts in the sensor circuit
- Coolant level low or overheating engine
- Connector corrosion or damage
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to address this code soon, as it indicates a potential overheating issue. Continuing to drive could cause engine damage.
Will this code come back after clearing?
If the underlying issue is not resolved, the code likely will return, especially if the sensor is faulty or there's a cooling issue.
Why did this code appear with SPN 6111?
Both codes relate to temperature sensing. SPN 6111 might indicate a different sensor, but it often occurs together with SPN 6122 due to shared wiring or faults.
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