What Does P0098 Mean?
The ECM has detected a high voltage condition on the intake air temperature sensor 2 circuit on bank 1. For NTC thermistor-type IAT sensors, high voltage indicates very low resistance, corresponding to an implausibly high temperature reading. This is typically caused by a short circuit in the sensor or wiring. The ECM may limit engine power or boost as a protective measure based on the falsely high temperature reading.
Common Causes
35%
Short to ground in the IAT sensor 2 signal wire
30%
Internally shorted IAT sensor 2 thermistor element
20%
Water intrusion or contamination in the sensor connector causing low-resistance path
10%
Signal wire and ground wire shorted together in the harness
5%
ECM internal pull-up resistor or A/D converter fault
Diagnostic Steps
1
Check the IAT sensor 2 PID value. A reading of 250F+ (120C+) with the engine cold or at idle indicates a short circuit (minimum resistance reading).
2
Disconnect the IAT sensor 2 and check if the PID changes to approximately -40F (open circuit). If it does, the sensor is shorted internally. If it stays high, the wiring has a short.
3
Measure the disconnected sensor resistance. A very low reading (near 0 ohms) confirms an internally shorted sensor.
4
With the sensor unplugged, check for continuity between the signal wire and ground wire in the harness. Continuity indicates shorted wires that need repair.
5
Inspect the connector for moisture, contamination, or corroded pins that create a low-resistance path between the signal and ground circuits.
Estimated Repair Cost
$40 - $200
Parts + labor, varies by vehicle and location
The ECM has detected a high voltage condition on the intake air temperature sensor 2 circuit on bank 1. For NTC thermistor-type IAT sensors, high voltage indicates very low resistance, corresponding to an implausibly high temperature reading. This is typically caused by a short circuit in the sensor...
The most common cause of P0098 (Intake Air Temperature Sensor 2 Circuit High Bank 1) is: Short to ground in the IAT sensor 2 signal wire
Typical repair costs for P0098 range from $40 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short distances but performance may be noticeably reduced. The ECM may aggressively pull ignition timing and reduce boost based on the false high-temperature reading, resulting in significant power loss. On turbocharged vehicles, this can be particularly noticeable. No immediate safety hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0098 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Management / Sensor System
Difficulty
Type
Generic (SAE)
Recommended Tools
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