P2A0AManifold Absolute Pressure Sensor B Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Engines with two intake manifold pressure sensors call the second one sensor B; in GM's tables for the Corvette's LT6 V8 it measures the manifold pressure of bank 2, next to the bank-1 sensor that uses the familiar P0105–P0109 codes. P2A0A is the general circuit fault of sensor B, meant for cases where the module sees a circuit problem without sorting it into low, high or intermittent. No manufacturer documents P2A0A publicly – the LT6 tables split electrical faults of this sensor into P2A0C and P2A0D. CARB requires checks for broken circuits and implausible extremes on every input that affects emissions. Without a usable MAP B signal the module estimates the air charge of the affected bank from a model, which can cost smoothness and power.
- What you may notice
- Check engine light on
- Uneven running or hesitation
- Possible reduced power
- Likely causes
- LikelyLoose connector, corroded terminal or damaged wire at sensor B
- PossibleMAP sensor B failed internally
- Rare5 V reference shared with other sensors pulled down
- 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: €40 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.