Turbocharger/Supercharger Boost Sensor B Circuit High

Where it lives

For P0242, the circuit described runs through the sensor. The description of P0242 reports a fault at the sensor.

Check these first

• A short to voltage in the sensor B signal wire
• An open in the sensor B ground
• A faulty boost sensor B
• Corrosion in the sensor connector
• A turbo or supercharger overboosting

What to do next

1. Read boost sensor B voltage on a scan tool with the key on
2. Inspect the sensor B wiring for a short to voltage or an open ground
3. Check the sensor ground at the connector with a volt drop test
4. Check wastegate or bypass operation for overboost
5. Replace boost sensor B if the signal stays high with good wiring
6. Clear the code and retest

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