P0234 - TURBOCHARGER / SUPERCHARGER "A" OVERBOOST CONDITION CODE

POST UPDATED IN July, 2020

Description of DTC code P0234 Generic

Basically, the DTC code P0234 OBD2 indicates that the Power Train Control Module (PCM) has detected a boost pressure that is dangerous for the forced induction system of the engine.

In general, the engine must have a vacuum that is caused by the movement of the piston down, in order to attract the load of air and fuel to the engine. The air turbocharger is used to increase the air and fuel load entering the engine. This process is known as forced induction, with which a small, fuel efficient engine can create the power of a larger engine.

The turbocharger is located in line with the exhaust system. As the boost pressure increases, the motor voltage also increases. Therefore, the motor has predetermined limits, thus avoiding future faults in any component of the motor. When the fault code P0234 is established, it means that these limits have been passed, that is why it is recommended to make the necessary repairs as soon as possible, to avoid damage to the engine or transmission.

Symptoms of fault code P0234 Generic

  • The Check Engine light comes on.
  • Misfiring.
  • The engine loses power.
  • Engine overheating.
  • Transmission changes can be abrupt.

Causes of OBD2 P0234 Generic

When the diagnostic code P0234 OBD II is established, it means that one or more of the following problems has occurred:

  • The turbocharger relief valve may be clogged or defective.
  • The discharge valve solenoid is sticking.
  • The rod that goes from the discharge gate actuator to the discharge gate in the turbo can be bent.
  • The gate control hose may be clogged causing the boost pressure to not fall sufficiently in the expected manner.

Possible solutions of the DTC code P0234 Generic

To correct the problems caused by code P0234 you must do the following:

  • Inspect the actuator rod of the discharge valve. Repair or change as necessary.
  • Check the hoses, including the impulse controller to the discharge gate actuator. Also, check the controller's power lines. Verify that they are in good condition, that they do not have cracks or are disconnected. Make sure you do not have lines covered. Make the necessary repairs or change.
  • Connects a vacuum pump to the discharge valve controller. Then pump slowly, and observe the actuator rod. You should look at the inches of mercury you need to operate the rod or even if the rod moves. Compare these notes with the manufacturer's specifications regarding the vacuum needed to activate the discharge valve. If they are not within those specifications, you must change the actuator.
  • If the actuator of the waste gate can not contain the vacuum, or the rod does not move, you must change the actuator.
  • If there is a vacuum, but the rod can not be moved, you must remove the turbo and repair the discharge valve.

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