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P0290 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


Let’s begin by defining basic things before we look at the details. The DTC is a common system vehicle manufacturers use for identifying and communicating issues to different systems, also known as OBDI codes. One such code is P0290, which relates to a problem with the turbocharger or supercharger system.


P0290 specifically points to a “turbocharger/supercharger ‘A’ control circuit low” issue. In simple terms, this means you have a problem with your vehicle’s electrical system that controls the supercharger or turbocharger. In a twin-turbo setup, the ‘A’ in the code often refers to the primary engine.


To effectively troubleshoot a P0290 DTC code, it is essential to understand what produces it. Typical reasons include

  • Turbocharger or Supercharger Malfunction: If the turbocharger or supercharger is broken, it may be the reason why the control circuit displays “low.”
  • Wiring Issues: Damaged wiring, connectors, or loose connections in the control circuit can trigger this code.
  • Faulty Sensors: This code can lead to problems with sensors that monitor the turbocharger’s performance.
  • Software or ECM Issues: Occasionally, it may be related to software or engine control module (ECM) problems.


A P0290 code’s corresponding symptoms might help you find the problem more quickly. Typical signs include:

  • Reduced Engine Power: Your car’s engine might not be as powerful or it might not accelerate as rapidly.
  • Fuel Efficiency Issues: A broken turbocharger might result in poor fuel economy.
  • Check Engine Light: The most obvious sign is the illuminated check engine light on your dashboard.


A P0290 code is often diagnosed by:

  • Code retrieval: Get the code with an OBD-II scanner.
  • Visual inspection: Look for any obvious damage to the wiring and the turbocharger/supercharger system.
  • Sensor testing: Examine the system-related sensors.
  • Wiring and Connector Inspection: Ensure all wiring and connectors are in good condition.
  • ECM Examination: If all else checks out, consider inspecting the ECM for potential issues.

Common mistakes

Avoid these common mistakes when dealing with a P0290 code:

  • Ignoring It: Ignoring the code can lead to more significant issues and reduced vehicle performance.
  • Replacing Parts Without Diagnosis: Take your time with a proper diagnosis, as this can be costly and ineffective.

How serious is this?

The root cause of a P0290 code determines how serious it is. Even while it might not result in failures, neglecting it might result in decreased performance, decreased fuel economy, and sometimes even long-term engine damage.

What repairs can fix the codeS?

repair manuals

Repair solutions often include:

  • Turbocharger or Supercharger Replacement: If the unit itself is faulty.
  • Repairing or Replacing Wiring: Addressing damaged wiring or connectors.
  • Sensor Replacement: Replacing faulty sensors.
  • ECM Reprogramming or Replacement: If ECM issues are detected.

Related codes

Some related codes to be aware of include P0291 (Turbocharger/Supercharger “A” Overboost Condition) and P0292 (Turbocharger/Supercharger “A” Overboost Condition).


Finally, an issue with the supercharger or turbocharger control circuit of your vehicle may be detected by a DTC code P0290. Failure to address it or incorrect diagnosis may result in problems of performance and effectiveness. To ensure the smooth functioning of your vehicle, it’s important to take this code with a great deal of seriousness, diagnose accurately, and address the root cause without delay.

If you’re not confident in your diagnostic and repair skills, it’s advisable to consult a professional mechanic to resolve the issue effectively and prevent further damage.

P0290 Code – What Does It Mean & How To Fix It