P0033 - Turbo/Super Charger Bypass Valve Control Circuit / Open

About Trouble Code P0033

This trouble code has slightly different definitions depending on manufacturer. In general, if you are seeing code P0033, it’s because you have a problem with the bypass system for the turbo or supercharger’s ability to relieve pressure. Depending on the system design this can be the relief of only some or all pressure.

Symptoms of Trouble Code P0033

When trouble code P0033 is present, the check engine light will illuminate. The engine’s computer will not be able to control the bypass valve and a loss of power will be noticed due to the erratically working turbo or supercharger. There may also be a jerky feeling during acceleration.

Causes of Trouble Code P0033

The manufacturer specifies the amount of boost level the engine’s computer will give through information provided by the sensor input voltage signals. If the computer reads these to be off of specification, trouble code P0033 will surface. If the boost is low, it may be due to pressure being sent through the bypass valve when it should be closed. The turbo or supercharger may have a leak, reducing the ability to boost the intake system. There could also be a problem with the bypass valve not allowing pressure relief, due to damage or sticking.

How to Fix Trouble Code P0033

You want to first verify the code by clearing it, taking the vehicle for a drive, and watching to see if it resurfaces. Once verified, you will want to do a pressure test on the intake system between the turbo or supercharger and the intake throttle valve. Compare your reading to the manufacturer’s specifications. If you find it low, check hoses, intercoolers, pipes, and clamps for sign of damage and make sure they are not loose. If that all checks out check the bypass valve itself, determine if it is slightly or completely open for allowance of pressure release. If you find it to high, you will want to check the bypass valve to make sure it will open at maximum boost as per the manufactures specs. You will usually have to replace the valve or the actuator on the diaphragm operated system. If the pressure is ok in both directions, you may need to replace the pressure sensor itself.

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