P0249 Turbocharger Wastegate Solenoid B Range/Performance

Understanding Turbocharger Wastegate Solenoid B Range/Performance Issues

If you own a turbocharged vehicle, you may have encountered a warning light or diagnostic trouble code (DTC) related to the turbocharger wastegate solenoid. This component plays a critical role in regulating the boost pressure of the turbocharger, which can affect the engine performance, efficiency, and durability. In this article, we will explain what the wastegate solenoid does, why it matters, and how to diagnose and fix issues related to its range and performance.


Turbochargers are popular among car enthusiasts and manufacturers because they can increase the power and torque output of an engine without adding too much weight or complexity. However, turbochargers also require precise control of the boost pressure, which is the amount of compressed air that enters the engine through the intake manifold. Too little boost can lead to sluggish acceleration and poor fuel economy, while too much boost can cause detonation, overheating, and damage to the engine.

To regulate the boost pressure, turbochargers typically use a wastegate, which is a valve that diverts some of the exhaust gases away from the turbine wheel, reducing its speed and thus the amount of air that it can compress. The wastegate can be controlled by a mechanical linkage or an electronic solenoid, which opens and closes a bypass port in the wastegate actuator. The solenoid is connected to the engine control module (ECM), which sends signals that adjust the duty cycle of the solenoid, determining how much pressure is allowed to bypass the turbine.

Problem Definition

When the ECM detects a fault in the wastegate solenoid circuit, it may set a DTC such as P0249, indicating that the solenoid is stuck open, stuck closed, or operating outside of the expected range. This can lead to various symptoms, depending on the severity and duration of the issue. For example, you may notice:

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  • Lack of power or acceleration, especially at high speeds or under load
  • Poor fuel economy, due to the engine working harder and using more fuel to compensate for the lack of boost
  • Rough idle or stalling, caused by the inconsistent airflow and fuel mixture
  • Overheating or detonation, if the engine is subjected to too much load or pressure
  • Reduced lifespan of the turbocharger, due to excessive wear and tear on the turbine, bearings, and seals.


To diagnose a wastegate solenoid B range/performance issue, you may need to perform several tests and inspections, using a scan tool, a multimeter, and a vacuum gauge. Here are some steps you could follow:

  • Check the visual condition of the solenoid, wiring, and connectors, looking for signs of damage, corrosion, or loose connections.
  • Test the resistance of the solenoid with a multimeter, comparing it to the OEM specifications, which may vary depending on the make and model of your vehicle. If the resistance is out of range, you may need to replace the solenoid.
  • Check the voltage and ground signals of the solenoid connector with a multimeter, while commanding the ECM to activate the solenoid. If the signals are missing, inconsistent, or reversed, you may need to diagnose the wiring or the ECM.
  • Test the vacuum signal of the wastegate actuator, using a vacuum gauge or a hand-held vacuum pump. If the vacuum is too low or too high, you may need to diagnose the vacuum lines or the wastegate actuator.
  • Inspect the turbocharger for any signs of damage, wear, or debris, which may affect the performance or reliability of the whole system.

Repair Options

Depending on the root cause of the wastegate solenoid B range/performance issue, you may need to repair or replace various components. Here are some options you could consider:

  • Replace the wastegate solenoid, following the OEM procedure, and using a high-quality replacement part that matches the specifications and design of the original. Test the new solenoid for proper resistance, voltage, and duty cycle.
  • Repair or replace any damaged or corroded wiring or connectors, following the OEM procedure and using proper tools and materials. Test the circuits for continuity, resistance, and insulation.
  • Diagnose and repair any vacuum leaks or restrictions in the system, using a smoke machine, a vacuum pump, or a propane torch. Check the vacuum lines, the wastegate actuator, and the solenoid valve for proper function and sealing.
  • Inspect and clean the turbocharger, using a degreaser, a brush, and a blower. Remove any debris, carbon buildup, or oil residue that may affect the turbine or the compressor.
  • Check and update the ECM software or calibration, if necessary, using a compatible scan tool or software. Verify that the new settings improve the performance and efficiency of the engine.


The turbocharger wastegate solenoid is a critical component that can affect the boost pressure and performance of a turbocharged engine. If you encounter a wastegate solenoid B range/performance issue, you should diagnose and fix it as soon as possible, using proper tools, techniques, and components. By doing so, you can prevent further damage to the engine and the turbocharger, and enjoy a smoother and more powerful ride.


  1. What causes a wastegate solenoid B range/performance issue?
    A: The most common causes are a faulty solenoid, damaged wiring or connectors, vacuum leaks or restrictions, and ECM software or calibration issues.
  2. How do I know if my wastegate solenoid is stuck open or closed?
    A: You can test the resistance of the solenoid with a multimeter, or manually apply voltage to it and observe the movement of the wastegate actuator.
  3. Can I drive my car with a wastegate solenoid B range/performance issue?
    A: It is not recommended, as it can lead to poor performance, fuel economy, and engine damage.
  4. How much does it cost to replace a wastegate solenoid?
    A: The cost varies depending on the make and model of your vehicle, but it can range from $50 to $200 for the part and $100 to $500 for the labor.
  5. Can I clean or repair a wastegate solenoid instead of replacing it?
    A: In some cases, you can clean or repair the solenoid, but it depends on the nature and extent of the damage or wear. It is usually safer and more efficient to replace the solenoid with a new one.