P2433AIR System Air Flow/Pressure Sensor Circuit High (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- With P2433 the bank 1 secondary air pressure signal sits above its upper limit, pointing to a signal wire shorted to the 5 V reference or to battery voltage, an open sensor ground or a failed sensor. GM uses more than 95 % of the reference on the 2005–2006 3.8L V6, more than 94 % on the 2006 Corvette and CTS-V V8s and in the 2018 tables (800 of 1,000 samples), always as a Type B fault watched without a break. Volkswagen's 2014 data put the threshold above 4.65 V (Beetle, Golf CBFA) or above 4.5 V (2.5L engine). A broken ground often shared with other sensors can make them report at the same moment, which helps narrow the search. P2432 is the low-side partner, P2438 the bank 2 version.
- What you may notice
- Check engine lamp after two trips
- Secondary air readiness stays incomplete
- Likely causes
- LikelySignal wire shorted to 5 V reference or battery voltage
- PossibleOpen sensor ground or corroded ground terminal
- PossiblePressure sensor failed internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.