P0236 moderate

Turbo/Supercharger Boost Sensor B Circuit

The P0236 code means the vehicle's onboard diagnostic system has detected: Turbo/Supercharger Boost Sensor B Circuit. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$80 - $350 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Reduced turbo boost or boost cut
  • Loss of power during acceleration
  • Possible limp mode activation

Probable Causes (Ranked by Likelihood)

  • Faulty turbo boost pressure sensor B Very High
  • Damaged wiring or connector to boost sensor High
  • Boost leak in the intake system Moderate
  • PCM/ECM circuit fault Low

Step-by-Step Diagnostic Procedure

  1. Read boost sensor B PID on scan tool. Compare to sensor A (if equipped). At key-on engine-off, both should read atmospheric pressure.

  2. Locate boost sensor B (typically on the intake manifold or charge pipe). Inspect connector for damage.

  3. Test sensor output voltage: should be about 1.0-1.5V at atmospheric pressure, rising with boost.

  4. Pressure-test the boost system with a boost leak tester to rule out leaks causing incorrect readings.

Frequently Asked Questions

What is boost sensor B?

Boost sensor B is a secondary boost pressure sensor used on some turbocharged engines for redundancy or to measure pressure at a different point in the intake system.

Why does my turbo car have two boost sensors?

Redundant sensors allow the PCM to cross-check readings for accuracy and detect sensor failures quickly to protect the engine from overboosting.

Can I drive with P0236?

You can drive short distances, but the PCM may limit boost pressure or enter limp mode. The vehicle will have reduced power.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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