P2A0CManifold Absolute Pressure Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2A0C reports that the MAP B signal voltage is too low. Manifold pressure sensors are usually three-wire parts fed from a 5 V reference; a signal close to zero means a broken reference or signal wire, a ground short or a dead sensor, because even deep vacuum would not pull a healthy sensor down that far. GM documents the code for the Corvette's LT6 V8, whose sensor B measures the manifold pressure of bank 2: a reading below 0.5 V for 1.5 s sets it after one trip. The bank-1 sensor reports the same condition as P0107. Once the signal is lost the module falls back on a modelled pressure for that bank, so the engine keeps running, but response and smoothness may suffer and power may be cut back.
- What you may notice
- Check engine light on
- Sluggish response or rough running
- Possible reduced engine power
- Likely causes
- Likely5 V reference or signal wire open
- PossibleSignal wire shorted to ground
- 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.