Inlet Air Temperature Sensor 1 Voltage Low
The inlet air temperature sensor voltage is lower than expected.
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What it means (plain English)
The engine's computer is getting a very low voltage reading from the inlet air temperature sensor, which means it thinks the air temperature is much colder than it really is, impacting performance.
What the computer is actually seeing
The engine control module (ECM) expects a voltage reading from the inlet air temperature sensor to be within a certain range (typically 0.5V to 4.5V). When a reading drops below 0.1V, it triggers this fault code.
What a healthy reading looks like
Inlet air temperature sensor should provide between 0.5V (25°C or 77°F) and 4.5V (90°C or 194°F) based on temperature conditions.
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 connector at the inlet air temperature sensor for loose or corroded pins. Repair as necessary. Decision: If repaired, clear code and test drive. If not, proceed to step 2.
- 22. Measure the voltage at the inlet air temperature sensor with the engine running. Expected voltage should be between 0.5V and 4.5V. Decision: If voltage is valid, replace the ECM. If voltage is low, proceed to step 3.
- 33. Inspect the wiring harness between the sensor and the ECM for any damage or shorts. Repair found issues. Decision: If repaired, clear code and test drive. If not, replace the inlet air temperature sensor.
Common causes
- Wiring issues (shorts or opens)
- Faulty inlet air temperature sensor
- Bad connector or corrosion
- ECM malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity, so you can drive, but expect reduced performance and possible hard starting.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, the code will return.
Why does this code pair with other codes?
Related codes often indicate systemic issues in engine temperature management or air intake systems.
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