P2595 critical

Turbocharger Boost Control 'B' Position Exceeded

The P2595 code means the vehicle's onboard diagnostic system has detected: Turbocharger Boost Control 'B' Position Exceeded. This is a critical severity code.

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Keep driving?
No -- stop driving
DIY difficulty
hard
Estimated cost
$400 - $2500 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Overboost from secondary turbocharger
  • Engine detonation or knock
  • Severe limp mode
  • Risk of catastrophic engine failure

Probable Causes (Ranked by Likelihood)

  • Secondary turbo wastegate stuck closed Very High
  • Boost control valve for secondary turbo failed High
  • Control solenoid short causing continuous boost Moderate
  • PCM overboost protection malfunction Low

Step-by-Step Diagnostic Procedure

  1. Read freeze frame data and confirm P2595 is stored

  2. Verify actual boost levels with mechanical gauge

  3. Test secondary turbo wastegate operation manually

  4. Inspect boost control solenoid and wiring for shorts

Frequently Asked Questions

What does P2595 mean?

P2595 indicates an issue with the turbocharger boost control 'b' position exceeded. This affects the PCM's ability to properly control turbocharger boost levels.

Can I drive with a P2595 code?

Do not drive with this code. An overboost condition can cause catastrophic engine damage including blown head gaskets or cracked pistons.

How much does it cost to fix P2595?

Repairs typically cost $400 - $2500, depending on the specific component that has failed.

Sources

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

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