2006 Mazda 6 MazdaspeedFACTORY OEM SERVICE PROCEDURE

DTC P0234: Notes

DTC P0234 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0234 Turbo/supercharger overboost condition
DETECTION CONDITION 
  • If the manifold absolute pressure or charging efficiency are more than the specification for the specified period of time, the PCM determines that the turbocharger is in an overboost condition.

    MONITORING CONDITIONS 

    • Engine speed is 2, 00 RPM or more. 

Diagnostic support note 
  • This is a continuous monitor (Other).
  • The MIL does not illuminate.
  • FREEZE FRAME DATA is not available.
  • DTCs are stored in the PCM memory.
POSSIBLE CAUSE 
  • Wastegate control solenoid valve malfunction
  • Vacuum hose looseness or damage
  • Improper installation of the vacuum hose
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.