P2438AIR System Air Flow/Pressure Sensor Circuit High (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2438 is the bank 2 counterpart of P2433: the secondary air pressure signal of the second bank reads above its upper limit. GM mentions P2438 next to P2437 among the codes that block its AIR sensor and flow tests in the 2018 tables, but publishes no row of its own for it, because the engines described there have one air path. For comparison, GM's bank 1 sensor fails above 94–95 % of the 5 V reference. Typical triggers are a signal shorted to supply voltage, an open ground or an internal sensor defect; Audi's R8 V10, which carries a separate bank 2 sensor G610, shows where such a part sits. No public manufacturer document describes the conditions for P2438 itself. While it is stored, the pump and valve tests cannot be judged.
- What you may notice
- Check engine lamp
- Secondary air readiness stays incomplete
- Likely causes
- LikelySignal wire shorted to reference or supply voltage
- PossibleOpen ground circuit of the bank 2 sensor
- PossibleBank 2 pressure 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: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.