Powertrain
Definition only
Lights the check engine lamp
P2A0B: Manifold Absolute Pressure Sensor B Circuit Range/Performance
Standardized SAE J2012 code · P2Axx codes
What does P2A0B mean?
The MAP B signal does not correlate with TPS, MAF, or RPM as expected. Vacuum leak, restricted port, or sensor drift.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Vacuum leak in intake
- Medium Sensor zero drifted
- Low Sensor element aged beyond calibration window
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2A0B on the same make and model first.
P2A0B in the community
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