Code Definition

P122D — Intake Air Flow Position Sensor Exceeded Learning Limit

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Holden

About P122D

P122D is a manufacturer-specific powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P122D is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P122D is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) performs a self learning routine to establish the minimum and maximum positions of the intake air flow control device, typically the electronic throttle body or intake air control valve, using feedback from the intake air flow position sensor. DTC P122D is set when the ECM is unable to complete or store this learned position within calibrated limits. This occurs when the commanded position and the actual sensor feedback differ beyond an allowable threshold during adaptation, indicating restricted movement, incorrect airflow feedback, or an inability of the syste...

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