Engine Intake Air Temperature Sensor Voltage High
The ECM has detected a high voltage from the intake air temperature sensor.
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What it means (plain English)
The engine's control computer is seeing too much voltage coming from the intake air temperature sensor, which suggests a problem with the sensor or its wiring.
What the computer is actually seeing
The ECM expects the intake air temperature sensor to send a voltage signal corresponding to the air temperature; typically between 0.5V (around -40°C) to 4.5V (around 125°C).
What a healthy reading looks like
Voltage from the intake air temperature sensor should range from 0.5V to 4.5V depending on temperature. If reading is above 4.5V, there's a fault.
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 connector for the intake air temperature sensor for damage or corrosion (first step).
- 2With the engine running, measure the voltage at the intake air temperature sensor. Is it above 4.5V?
- 3If yes, check the wiring harness for shorts. If the wiring is intact, replace the sensor and retest.
- 4If voltage is normal, check the ECM's input signal for corroded pins or connection issues.
- 5If connections are good, suspect a malfunction in the ECM.
Common causes
- Shorted sensor wiring
- Faulty intake air temperature sensor
- Poor electrical connection
- Damaged ECM inputs
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Driving with this code is moderate risk; the engine may run poorly but is usually drivable.
Will this code come back after clearing?
If the issue isn't fixed, the code will likely return after a short period.
Why does this code sometimes pair with SPN 1291?
SPN 1291 is related to intake air temperature sensor voltage low; both indicate potential faults in the same sensor circuit.
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