What Does P00A8 Mean?
The PCM has detected a high-voltage condition on the intake air temperature sensor 2 circuit for bank 2. For NTC thermistor sensors, high voltage means very high resistance, which the PCM interprets as an extremely low (implausible) temperature. This is typically an open-circuit condition where the sensor is disconnected, has failed open, or has a broken wire. The PCM will default to a substitute temperature value for engine management.
Common Causes
30%
Open-circuit failure in the intake air temperature sensor 2 on bank 2
30%
Disconnected or loose sensor connector
20%
Broken signal or ground wire in the sensor circuit
15%
Corroded connector pins creating an open connection
5%
Signal wire shorted to 5V reference line
Diagnostic Steps
1
Check the IAT sensor 2 bank 2 PID — a reading of -40°F or extremely low temperature with the engine cold confirms an open/high circuit.
2
Verify the sensor connector is fully seated and the locking tab is engaged — simply reconnecting a loose connector may resolve the issue.
3
Disconnect the sensor and measure resistance across the terminals — it should be 2–3 kΩ at room temperature. An OL (infinite) reading means the sensor has failed open.
4
If the sensor tests good, connect a known-good 2.2 kΩ resistor across the harness-side connector pins — if the PID shows a plausible temperature reading, the wiring to the PCM is intact and the original sensor is faulty.
5
Perform a continuity test on the signal and ground wires from the sensor connector back to the PCM connector to identify any open wires.
Estimated Repair Cost
$40 - $200
Parts + labor, varies by vehicle and location
The PCM has detected a high-voltage condition on the intake air temperature sensor 2 circuit for bank 2. For NTC thermistor sensors, high voltage means very high resistance, which the PCM interprets as an extremely low (implausible) temperature. This is typically an open-circuit condition where the ...
The most common cause of P00A8 (Intake Air Temperature Sensor 2 Circuit High Bank 2) is: Open-circuit failure in the intake air temperature sensor 2 on bank 2
Typical repair costs for P00A8 range from $40 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. The PCM will use a default temperature value which is adequate for normal driving. Fuel economy and emissions may be slightly affected. Repair when convenient to restore optimal engine management.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P00A8 to identify the root cause.
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Quick Info
Category
Powertrain
System
Intake Air System
Difficulty
Type
Generic (SAE)
Recommended Tools
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