Intake Air Temperature Sensor 2 Circuit High Bank 2
The P00A8 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the Intake Air Temperature (IAT) Sensor 2 on Bank 2 that is higher than the expected range, typically above 4.5 volts. This sensor measures the temperature of the air entering the engine's second bank of cylinders. A high voltage reading usually corresponds to a very low temperature reading (e.g., -40°F) or an open circuit. This can cause incorrect air-fuel mixture calculations, leading to poor engine performance, increased emissions, and potential drivability issues.
01. Most Common Causes
- Faulty Intake Air Temperature Sensor 2
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- ECM issues (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle or hesitation
- Black smoke from exhaust (rich condition)
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the IAT sensor 2 connector and wiring for damage, corrosion, or loose connections.
Step 3: Disconnect the sensor and measure resistance; compare to manufacturer specifications (typically 2-10 kΩ at room temperature).
Step 4: Check voltage at the sensor connector with ignition on; should be around 5V reference and ground continuity.
Step 5: If sensor and wiring are OK, test the ECM output; if not, replace the sensor or repair wiring.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause poor engine performance, increased emissions, and potential damage to the catalytic converter due to incorrect air-fuel mixture.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates. The sensor itself is usually inexpensive.