P2A0DManifold Absolute Pressure Sensor B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A0D is the high-voltage counterpart: the MAP B signal sits close to the reference voltage. Typical reasons are an open ground wire, a signal wire shorted to the 5 V reference or to battery voltage, or a sensor that has failed internally. For the Corvette's LT6 V8, GM sets P2A0D when the bank-2 manifold pressure sensor reads above 4.5 V for 1.5 s, after a single trip; the bank-1 sensor uses P0108 with practically the same limit. Such a voltage would stand for a pressure that the naturally aspirated intake cannot reach, so the module discards the value and works with a modelled pressure instead. Expect the warning light and, depending on the calibration, rough running or limited power.
- What you may notice
- Check engine light on
- Rough running or hesitation
- Possible limited power
- Likely causes
- LikelySensor ground wire open or connector not seated
- PossibleSignal wire shorted to the 5 V reference or battery voltage
- PossibleSensor B failed internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.