P00AE - Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic (Bank 1)
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
The P00AE code is stored when the Engine Control Module (ECM/PCM) detects an erratic or intermittent signal from the Intake Air Temperature (IAT) sensor number 2. In forced induction engines, IAT 2 is typically located after the intercooler to monitor the actual charge air temperature. If the voltage signal jumps unexpectedly or falls outside of mapped parameters, the ECM cannot accurately calculate air density, which is critical for fuel trim and ignition timing. This often results in the vehicle entering a power-reduction mode (Limp Mode) to prevent engine damage from pre-ignition/knock.
Possible Causes
Loose connection or corroded pins in the sensor connector.
Damaged wiring harness (chafing against chassis or heat exposure).
Faulty IAT sensor 2 (internal intermittent failure of the thermistor).
Grounding issues to the ECU or internal ECM failure.
Symptoms
Recommended Solution
- STEP 1: Inspect the connector at IAT sensor 2. Look for corrosion, pushed-out pins, or moisture. Clean with contact cleaner if necessary.
- STEP 2: Perform a 'wiggle test' on the wiring harness between the sensor and the ECU while monitoring live data on a scanner to identify intermittent breaks.
- STEP 3: Verify 5V reference voltage and ground. Measure sensor resistance (typically 2k-3k Ohms at 20°C). Resistance should drop smoothly as temperature rises; sudden jumps indicate a faulty sensor.
- STEP 4: If wiring and reference voltages are within spec (OEM values), replace the IAT sensor 2.
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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