In order to increase the efficiency and power output of engines, many modern vehicles are fitted with either a turbocharger or a supercharger. These engines are usually equipped with a bypass valve to relieve boost pressure on the outlet side of the turbo when the throttle is closed.
P0033 is a generic trouble code related to a fault in the turbocharger bypass valve control circuit.
Diagnostic trouble code (DTC) P0033 stands for “Turbocharger Bypass Valve Control Circuit.” The code is set once your vehicle’s powertrain control module (PCM) detects a voltage signal from your turbocharger bypass valve that’s not within the programmed specifications.
Your vehicle’s turbocharger bypass valve is usually controlled by the PCM. The bypass valve stops excess pressure from building up when the throttle is quickly closed.
The PCM makes a calculation based on input data from different turbocharger and engine control sensors to determine the correct location of the bypass valve. A small motor is used to operate the valve. The motor receives output voltage/ground signals from the boost controller or the PCM. Once the PCM detects that the voltage signal is not within the predetermined range, it’ll trigger the code.
Note: The definition of code P0033 can differ depending on the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
DTC P0033 is a generic trouble code, so it can be logged in various vehicles. However, this does not mean that there is a universal fix for all makes and models.
If you’re an experienced DIYer, you can opt to do the job yourself. However, take note that you’ll have to know about the components of a turbocharged or supercharged engine before attempting any diagnosis and repair. If you’re not sure what to do, you can always have a mechanic diagnose the problem.
Fixing the P0033 code isn’t easy. If you’re not a seasoned DIYer, we recommend taking your vehicle to a mechanic.
If you have the tools and technical knowledge to repair your ride, you can go ahead and attempt fixing it yourself. But before attempting to do anything with your vehicle, it’s a good idea to research vehicle-specific repair information.
Repair manuals like those from Chilton or a subscription to an online repair database may provide you with the information you need to clear this code.
The turbocharger bypass valve is a crucial component that stops excess pressure from building up in the throttle. As such, it’s imperative to replace it once it shows signs of wear or when your mechanic recommends it. Thankfully, CarParts.com makes shopping online for parts quick and hassle-free.
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