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Technical Description of OBD-II Trouble Code
Range/Performance Issue with Intake Air Temperature (IAT) Sensor 1 on Bank 2
What does that signify?
This diagnostic trouble code (DTC) is a generic powertrain code that is applicable to vehicles equipped with OBD-II. Although it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
The IAT (Intake Air Temperature) sensor is a thermistor that changes its resistance based on the temperature of the engine intake air. It is usually located in the air intake ductwork and consists of two wires. One wire receives 5 volts from the PCM (Powertrain Control Module), while the other wire serves as the ground. The PCM monitors the change in the supplied 5 volts to determine the air temperature and optimize 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. This code indicates that the PCM detected a larger-than-normal change in the IAT sensor signal circuit on bank 2 within a shorter-than-expected time. Bank 2 refers to the side of the engine that does not contain cylinder #1.
Related trouble codes for the IAT sensor circuit on bank 2:
Symptoms
Since this code is likely indicating an intermittent issue with the IAT circuit, there may not be any noticeable symptoms at the moment. However, the MIL (Malfunction Indicator Lamp) will likely be illuminated. The vehicle may experience some drivability problems, but it is more probable that the driver will not notice any significant symptoms.
Causes
Possible causes of the P00AB DTC include:
Possible Solutions
If there are other IAT codes present, it is recommended to diagnose them first. If not, then using a scan tool, verify the IAT voltage with KOEO (Key on Engine Off).
If the reading on a cold engine is the same as the CTS (Coolant Temperature Sensor), then the problem is intermittent. However, if the IAT reading does not match the CTS reading, refer to the diagnostic procedure for P0110. If your scan tool has a freeze frame failure records feature, utilize it to determine the IAT reading at the time of the failure. If the reading indicates an extremely cold temperature (around negative 30 degrees F), it suggests an intermittent high resistance reading on the IAT signal circuit.
Check for an open ground on the ground circuit and signal circuit. If they are functioning properly, try artificially raising and lowering the temperature of the IAT sensor. This can be done by removing the IAT and subjecting it to freezing temperatures and then applying heat using a heat gun (exercise caution to avoid melting the sensor). Monitor the resistance change using an ohmmeter connected to each terminal. The resistance should vary smoothly without any sudden jumps. If the reading suddenly jumps, replace the IAT sensor.
However, if the freeze frame reading indicates the highest extreme temperature (above 250 deg. F), it suggests an intermittent low resistance on the signal circuit. Check for a short to ground on the signal circuit. If no issues are found, perform the artificial heat test mentioned above and replace the IAT sensor as necessary. If the problem cannot be replicated, use a voltmeter to monitor the signal voltage while conducting a “wiggle” test on the wiring harness. Look for a sudden change in voltage, which indicates a short or open. Replace the IAT sensor as necessary.
This code is relatively straightforward and primarily detects extremely short changes that have relatively high voltage. In most cases, the faulty component is the sensor itself, unless the vehicle is significantly old, in which case there may be wiring harness problems.
Professional Service
While we always recommend resolving this issue through mechanical means, if that is not feasible for any reason, we offer the option to permanently delete this specific DTC. All other codes will continue to be addressed. If you are interested in this option, please upload your ECU file to our portal.
