Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Code 25, Intake Air Temperature High: Notes
Control module applies and monitors a voltage signal (4-6 volts) to intake air temperature sensor. When manifold air is cold, sensor resistance is high and control module sees a high signal voltage. As air warms, resistance decreases and voltage sensed by control module drops. Sensor resistance can be measured at sensor terminals with harness disconnected.
- This checks if code is a hard failure or an intermittent condition.
- This simulates conditions for a Code 23. If scan tester displays a low temperature, control module and wiring are not at fault.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.