Possible causes

– Faulty AIR Pressure Sensor
– AIR Pressure Sensor harness is open or shorted
– AIR Pressure Sensor circuit poor electrical connection

When is the code detected?

The PCM has detected a high voltage condition on the AIR Pressure Sensor signal circuit

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P2433 GMC Description

The Secondary Air Injection (AIR) System aids in the reduction of hydrocarbon exhaust emissions during a cold start-up. This occurs when the start-up engine coolant temperature (ECT) is between 5-50