What does P00AB Intake Air Temperature (IAT) Sensor 1 Circuit Range/Performance Bank 2 mean?
The P00AB OBD code stands for Intake Air Temperature (IAT) Sensor 1 Circuit Range/Performance Bank 2.
This code is a diagnostic trouble code that is commonly found in OBD-II equipped vehicles.
The IAT sensor is a thermistor that detects the temperature of the engine's intake air.
It is usually located in the air intake ductwork and has two wires connected to it.
The PCM monitors the change in voltage supplied to the sensor to determine the air temperature and adjust engine performance accordingly.
When the intake air is cold, the resistance is high, resulting in a high signal voltage.
Conversely, when the intake air is warm, the resistance is low, resulting in a low signal voltage.
The P00AB code indicates that the PCM detected a larger-than-normal change in voltage on the IAT sensor signal circuit on bank 2.
Bank 2 refers to the side of the engine that does not contain cylinder #1.
Possible causes for this code include a faulty IAT sensor, an open or short circuit in the signal or ground circuit, or a poor connection at the sensor or PCM.
If there are no other IAT codes present, the first step in diagnosing the issue is to verify the IAT voltage with a scan tool while the engine is off.
If the voltage reading is the same as the coolant temperature sensor, it suggests an intermittent problem.
If the IAT reading is not the same as the CTS, further diagnostic procedures need to be followed.
If the issue cannot be duplicated, additional tests involving temperature changes and voltage monitoring may be necessary.
It is important to address this code promptly to ensure proper engine performance and to prevent potential drivability problems.
P00AB Symptoms
- Intermittent MIL (Malfunction Indicator Lamp) on
Possible P00AB Causes
- Bad bank 2 IAT sensor
- Open in the signal or ground circuit
- Short to ground on the signal circuit
- Poor connection at sensor or PCM
Troubleshooting P00AB error code
- Diagnose any other IAT codes present first
- Using a scan tool, verify IAT voltage with KOEO (Key on engine off)
- If reading is the same as CTS (Coolant temperature sensor) on a cold engine, problem is intermittent; refer to diagnostic procedure for P011
- If freeze frame reading was at extremely cold temperature (negative 30 deg. F), check for an open in the ground circuit and signal circuit
- Artificially raise and lower the temperature of the IAT sensor and monitor resistance change using an ohmmeter
- If resistance jumps suddenly, replace IAT sensor
- If freeze frame reading was at extremely high temperature (above 250 deg. F), check for a short to ground on the signal circuit
- Artificially heat the IAT sensor and monitor resistance change using an ohmmeter
- If resistance jumps suddenly, replace IAT sensor
- If problem canu0027t be duplicated, use a voltmeter to watch the signal voltage while wiggling the wiring harness
- Watch for sudden change in voltage indicating a short or open
- Replace IAT sensor as necessary