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.
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HOMESERVICE MANUALSCHEVROLET2000C TAHOE 2WD V8-4.8L VIN VREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONINTAKE AIR TEMPERATURE SENSOR
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN V
Intake Air Temperature Sensor
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN VSECTION Intake Air Temperature Sensor
The Intake Air Temperature (IAT) sensor is incorporated into the MAF sensor component body. The IAT sensor is a thermistor which changes value based on the temperature of air entering the engine. Low temperature produces a high resistance, 100,000 ohms at -38°C (-39°F). A high temperature causes low resistance 70 ohms at 130°C (266°F). The PCM supplies a 5.0 volt signal to the sensor through a resistor in the PCM and measures the voltage. The voltage is high when the incoming air is cold, and low when the air is hot. The PCM calculates the incoming air temperature by measuring the IAT voltage. The IAT sensor signal is used to adjust spark timing according to incoming air density.
The scan tool displays the temperature of the air entering the engine, which should read close to ambient air temperature when the engine is cold. The temperature should rise as the underhood temperature increases. If the engine has not been run for several hours, overnight, the IAT sensor temperature and engine coolant temperature should read close to each other. The following DTCs set if the PCM detects a malfunction in the IAT sensor circuit:
^ DTC P0112 IAT Sensor Circuit Low Voltage
^ DTC P0113 IAT Sensor Circuit High Voltage
^ DTC P1111 IAT Sensor CKT Intermittent High Voltage
^ DTC P1112 IAT Sensor CKT Intermittent Low Voltage
The scan tool displays the temperature of the air entering the engine, which should read close to ambient air temperature when the engine is cold. The temperature should rise as the underhood temperature increases. If the engine has not been run for several hours, overnight, the IAT sensor temperature and engine coolant temperature should read close to each other. The following DTCs set if the PCM detects a malfunction in the IAT sensor circuit:
^ DTC P0112 IAT Sensor Circuit Low Voltage
^ DTC P0113 IAT Sensor Circuit High Voltage
^ DTC P1111 IAT Sensor CKT Intermittent High Voltage
^ DTC P1112 IAT Sensor CKT Intermittent Low Voltage
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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.