P0033 Fault Code

P0033 OBD-II Trouble Code Short Description

Turbo Charger Bypass Valve Control Circuit

What does trouble code P0033 mean?

The P0033 fault code indicates a problem with the turbocharger bypass valve control circuit. This valve is responsible for regulating the flow of exhaust gases through the turbocharger system.

When the engine control module (ECM) detects an issue with the turbocharger bypass valve control circuit, it typically means that there is a malfunction or low voltage condition within the circuit. This could be caused by a faulty bypass valve solenoid, damaged wiring or connectors, or a problem with the ECM itself.

To diagnose and troubleshoot the P0033 code, it is recommended to perform the following steps:

  1. Inspect the wiring and connectors: Check for any damaged or loose connections, frayed wires, or corrosion. Repair or replace any faulty parts as necessary.

  2. Test the bypass valve solenoid: Measure the resistance of the solenoid using a multimeter. Compare the readings with the manufacturer's specifications. If the resistance is outside the acceptable range, replace the solenoid.

  3. Check for vacuum leaks: Inspect the turbocharger system for any vacuum leaks that may be affecting the bypass valve. Repair or replace any damaged hoses or components.

  4. Verify ECM functionality: If all other components appear to be working properly, it may be necessary to check the functionality of the ECM. This requires specialized diagnostic equipment and knowledge, so it is recommended to consult a professional mechanic or dealership.

By addressing and resolving the underlying issue triggering the P0033 code, you can restore proper functioning of the turbocharger bypass valve and ensure optimal performance of your vehicle's turbocharger system.


What are the symptoms of the P0033 code?

P0033 refers to a fault code related to the Turbo Charger Bypass Valve Control Circuit. The symptoms of this fault code may include:

  • Check Engine Light (CEL) illuminated on the dashboard
  • Decreased engine performance or power
  • Turbocharger not engaging or functioning properly
  • Poor acceleration or throttle response
  • Excessive noise or whistling from the turbocharger
  • Engine stalling or hesitation during acceleration

It is important to have the issue diagnosed and repaired by a qualified mechanic to prevent further damage to the vehicle's turbocharger system.


What causes the P0033 code?

The P0033 fault code, also known as Turbo Charger Bypass Valve Control Circuit, can be caused by several factors. These include:

  1. Faulty turbocharger bypass valve: The turbocharger bypass valve controls the flow of exhaust gases to the turbocharger. If the valve is faulty or stuck in a closed or open position, it can trigger the P0033 code.

  2. Electrical issues: Problems with the wiring or connectors connected to the turbocharger bypass valve can cause the P0033 code. This can include issues like open circuits, short circuits, or corroded connections.

  3. Vacuum leaks: If there are leaks in the vacuum lines or hoses connected to the turbocharger bypass valve, it can lead to improper operation and trigger the P0033 code.

  4. Defective sensors: The P0033 code can also be triggered if there are issues with the sensors that monitor the turbocharger bypass valve, such as a faulty pressure sensor or position sensor.

  5. Engine control module (ECM) failure: In some cases, a malfunctioning or failed ECM can incorrectly detect a problem with the turbocharger bypass valve, leading to the P0033 fault code.

It is important to note that the specific cause of the P0033 code can vary depending on the make and model of the vehicle. It is recommended to consult a professional mechanic or utilize a diagnostic tool to accurately identify the underlying issue.

Possible Solutions

How to fix P0033?

  1. Check the electrical connector at the turbocharger bypass valve for any loose, damaged, or corroded contacts. Repair or replace as necessary.
  2. Inspect the wiring harness for any signs of damage or chafing. Repair or replace as necessary.
  3. Use a multimeter to check for continuity between the turbocharger bypass valve and the powertrain control module. Replace the valve if no continuity is detected.
  4. If the valve is operating correctly, check for voltage at the control circuit with the ignition turned on. If no voltage is present, there may be an issue with the PCM. Consult a professional for further diagnosis and repair.

Note: It is recommended to consult a qualified mechanic or refer to the vehicle's service manual for specific diagnostic and repair steps.

Additional Notes

It is important to address the P0033 fault code as soon as possible to prevent further damage to the turbocharger system and ensure optimal engine performance. Ignoring this fault code may result in decreased engine power and potentially lead to more expensive repairs in the future.