Intake Air Temperature Sensor Circuit Malfunction
Problem with the intake air temperature sensor circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer checks the temperature of the air coming into the engine to optimize performance. If it notices the readings are too high or too low compared to what it expects, it triggers this code.
What the computer is actually seeing
The engine control module (ECM) monitors the intake air temperature (IAT) sensor voltage, which typically should be between 0.5V and 4.5V based on the incoming air temperature.
What a healthy reading looks like
At 68°F (20°C), the IAT sensor should read approximately 2.5V. At 32°F (0°C), it should be around 0.5V and at 104°F (40°C), approximately 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.
- 1Check the wiring and connectors for damage or corrosion first. Look for obvious signs of wear, loose connections, or broken wires.
- 2Verify the IAT sensor readings with a scan tool. If it reads outside of expected values given the ambient temperature, proceed to the next step.
- 3Measure the voltage at the IAT sensor connector with the ignition on (engine off). The voltage should fall between 0.5V and 4.5V. If not, check for short or open circuits.
- 4If wiring is good and voltage is normal, replace the IAT sensor if it’s reading incorrectly.
Common causes
- Faulty IAT sensor
- Wiring issues or damaged connectors
- Short circuit in the IAT circuit
- Open circuit in the IAT circuit
- ECM malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's usually okay to drive, but performance issues might occur. Fix it soon to avoid any operational inefficiencies.
Will this code return after I fix it?
If the underlying issue is resolved, the code should clear and not return.
Why does this code sometimes pair with other codes?
It's common for related systems to fail together, especially in cases of wiring issues affecting multiple sensors.
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