P0098 indicates that the Powertrain Control Module (PCM) has detected a voltage signal from the Intake Air Temperature (IAT) Sensor 2 on Bank 1 that is higher than the calibrated range. Because IAT sensors are typically negative temperature coefficient thermistors, a high voltage usually signals an extremely low temperature reading, an open circuit in the sensor or wiring, or a short to the 5-volt reference line.
The thermistor inside the sensor may have developed an internal open circuit, causing infinite resistance and a 5-volt signal to be returned to the PCM regardless of actual air temperature.
A break, corrosion, or disconnected pin in the signal wire between the sensor and PCM prevents the sensor from pulling the voltage down, causing the PCM's internal pull-up resistor to set the circuit high.
The signal wire may be chafed and touching the 5-volt reference wire or another power source, forcing the circuit voltage high.
Corroded, bent, or moisture-laden terminals in the sensor connector can create an open-circuit condition or high resistance that mimics a cold temperature reading.
Rarely, the PCM may have a failed internal pull-up resistor or signal processing error; this should only be considered after sensor and wiring integrity are confirmed.
Generally yes, for short periods. The PCM will use a default intake air temperature value, which may slightly reduce fuel efficiency or emissions performance but typically does not risk immediate engine damage.
Almost never. P0098 is almost exclusively caused by a failed sensor, wiring issues, or connector problems. PCM failure is extremely rare for this specific circuit fault.
It is typically located in the intake ducting after the intercooler (on turbocharged applications) or within the intake manifold, distinct from Sensor 1 which is often integrated into the Mass Airflow sensor.
No. This code indicates an electrical circuit issue (high voltage/open), not contamination of the sensing element. Cleaning will not repair an internal sensor failure or a wiring break.