Engine Intake Air Temperature Sensor 1 Anomaly
The engine's intake air temperature sensor is reporting abnormal readings.
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What it means (plain English)
The Engine Control Module (ECM) is seeing a reading from the intake air temperature sensor that doesn’t match expected values, indicating a possible fault with the sensor or its wiring.
What the computer is actually seeing
The ECM monitors the intake air temperature sensor voltage, which should typically range from 0.5 to 4.5 volts corresponding to -40°F to 276°F (-40°C to 135°C).
What a healthy reading looks like
Voltage should range from 0.5V (cold) to 4.5V (hot). Normal intake air temperature under operation is typically between 50°F and 100°F (10°C to 38°C), with corresponding voltages between 1.5V and 3.5V.
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.
- 1Inspect the wiring and connectors for damage, corrosion, or loose connections. Decision Point: If wiring/connectors look good, proceed to step 2. If faulty, repair or replace as necessary and retest.
- 2Measure the voltage at the intake air temperature sensor connector with the engine running. Expected voltage is 1.5V to 3.5V for normal temperatures. Decision Point: If voltage is within range, replace the intake air temperature sensor. If not, proceed to step 3.
- 3Check for any intake air leaks or blockages. Decision Point: If leaks or blockages are found, repair and retest. If none, the ECM may be faulty.
Common causes
- Faulty intake air temperature sensor
- Wiring issues between the sensor and the ECM
- Loose or corroded connectors
- Mechanical damage to the sensor
- Air intake leaks
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not in limp mode, but performance may be affected. Fix it soon.
Will the code come back after resetting?
If the issue isn’t fixed, the code will likely return.
Why does this code sometimes pair with other codes?
Related faults may affect sensor readings, triggering multiple faults.
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