What Does P00AA Mean?
The PCM has detected a general circuit malfunction with the intake air temperature sensor 1 on bank 2. This primary IAT sensor monitors the temperature of air entering the intake on the bank 2 side of the engine. The ECM uses this data for fuel injection calculations, spark timing, and emissions controls. A circuit fault means the sensor data cannot be trusted, and the PCM will substitute a default value that may not accurately represent actual intake conditions.
Common Causes
35%
Failed intake air temperature sensor 1 on bank 2 (open or shorted element)
25%
Wiring damage in the IAT sensor 1 bank 2 circuit
20%
Corroded or loose connector preventing reliable electrical contact
12%
Missing or faulty 5V reference voltage at the sensor
8%
PCM internal circuit failure on the IAT1 bank 2 input
Diagnostic Steps
1
Read the IAT sensor 1 bank 2 PID with the engine cold — it should match ambient temperature within 5°F/3°C. Values of -40°F or 280°F+ indicate open or short circuit faults respectively.
2
Disconnect the sensor and measure resistance across the terminals — expected 2–3 kΩ at 68°F/20°C for a standard NTC thermistor. OL means open; near 0 Ω means shorted.
3
With the sensor disconnected and key on, verify 5V reference voltage is present at the harness-side signal pin. If missing, trace the 5V reference circuit for a short or open.
4
Check the ground circuit at the harness connector — measure voltage drop from the ground pin to battery negative (less than 100 mV with circuit loaded).
5
Inspect the sensor connector and PCM connector pins for corrosion, moisture, or mechanical damage that could prevent reliable contact.
Estimated Repair Cost
$60 - $300
Parts + labor, varies by vehicle and location
The PCM has detected a general circuit malfunction with the intake air temperature sensor 1 on bank 2. This primary IAT sensor monitors the temperature of air entering the intake on the bank 2 side of the engine. The ECM uses this data for fuel injection calculations, spark timing, and emissions con...
The most common cause of P00AA (Intake Air Temperature Sensor 1 Circuit Bank 2) is: Failed intake air temperature sensor 1 on bank 2 (open or shorted element)
Typical repair costs for P00AA range from $60 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive short-term. The PCM will use a default value that provides adequate but not optimal engine management. Fuel economy and emissions may be affected. Repair in a timely manner.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P00AA to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Intake Air System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
