Engine Intake Temperature Sensor Circuit
Indicates a fault with the engine intake temperature sensor circuit.
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What it means (plain English)
The engine computer reads the temperature of the air entering the engine. If the reading is too high or too low, or the sensor isn’t working, it throws this code.
What the computer is actually seeing
The engine computer expects input from the intake temperature sensor to fall within a specific range, usually between -40°C to 120°C (-40°F to 248°F). Values outside this range indicate a fault.
What a healthy reading looks like
Intake air temperature should typically be between 15°C to 40°C (59°F to 104°F) during normal operation, depending on the environment.
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 intake air temperature sensor wiring and connectors for damage or corrosion. Repair as necessary. Decision: If OK, continue to step 2. If not, fix the wiring/connectors and retest.
- 22. Measure the resistance across the intake air temperature sensor at room temperature (20°C or 68°F). It should be around 2.5k ohms. Decision: If out of spec, replace the sensor. If within spec, continue to step 3.
- 33. Check the temperature readings through the scan tool. Compare the recorded intake temperature with actual ambient temperature. Decision: If readings are accurate, possible ECM fault; if not, replace the sensor.
Common causes
- Faulty intake air temperature sensor
- Wiring issues or corroded connectors
- Air intake duct leaks or restrictions
- ECM software issue
- Short circuit or open circuit in sensor wiring
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Can I still drive my truck with this code?
Yes, but performance may be affected. It's advisable to fix it soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will reappear.
What happens if I ignore this problem?
Ignoring could lead to reduced fuel efficiency and potential engine performance issues.
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