P0249 moderate

Turbo/Supercharger Wastegate Solenoid B Intermittent

The P0249 code means the vehicle's onboard diagnostic system has detected: Turbo/Supercharger Wastegate Solenoid B Intermittent. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$100 - $500 (parts and labor)
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Common Symptoms

  • Check Engine Light on intermittently
  • Boost level fluctuates unexpectedly
  • Power delivery inconsistent
  • Turbo may surge intermittently

Probable Causes (Ranked by Likelihood)

  • Loose wastegate solenoid B connector Very High
  • Intermittent wire break in solenoid circuit High
  • Failing solenoid with intermittent coil Moderate
  • PCM driver intermittent Low

Step-by-Step Diagnostic Procedure

  1. Monitor solenoid duty cycle on scan tool while tapping connector and wiring.

  2. Inspect connector for loose pins, heat damage, or corrosion.

  3. Check wiring at high-vibration and heat-exposure points.

  4. If wiring is intact, replace the wastegate solenoid.

Frequently Asked Questions

Why does my boost come and go?

An intermittent wastegate solenoid connection causes the boost control to lose regulation momentarily, resulting in boost fluctuations.

Is intermittent boost control dangerous?

It can be. Uncontrolled boost spikes can cause detonation and engine damage. Have it repaired promptly.

Can heat cause wastegate solenoid issues?

Yes, the solenoid is typically mounted in the engine bay near the turbo, exposing it to extreme heat that degrades wiring and connectors over time.

Sources

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

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