Manifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B Correlation

Where it lives

For P023E, the part to look at first is the sensor named here.

Check these first

• A faulty manifold absolute pressure sensor
• A faulty boost pressure sensor B
• Corrosion or damage in the sensor wiring or connectors
• A vacuum or boost leak between the two sensors
• A turbo or supercharger that is not building expected boost

What to do next

1. Compare MAP and boost sensor B pressure readings on a scan tool at idle and under load
2. Inspect both sensor connectors and wiring for corrosion or damage
3. Smoke test the intake for a vacuum or boost leak
4. Check the turbo or supercharger for a boost leak or weak output
5. Replace the sensor that reads off from the other
6. Clear the code and retest

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