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Technical Description of OBD-II Trouble Code
The circuit for the supply voltage of the Turbocharger/Supercharger Boost Control B is registering a high level
What does that mean?
This is a standard diagnostic trouble code (DTC) for powertrain issues and is commonly found in OBD-II vehicles. This can include vehicles from various manufacturers such as Chevy (Chevrolet), GMC (Duramax), Dodge, Ram (Cummins), Isuzu, Ford, Vauxhall, VW, and others. While it is a generic code, the specific repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle.
Turbochargers, superchargers, and other forced induction systems utilize energy generated by the engine (such as exhaust pulses or belt-driven screw-type mechanisms) to increase the amount of air introduced into the combustion chamber, resulting in improved volumetric efficiency.
In forced induction systems, it is necessary for intake pressures to vary and be adjusted according to the power requirements of the operator. Manufacturers incorporate a boost control valve (also known as a waste-gate, boost control solenoid, etc.) that is monitored and controlled by the ECM (Engine Control Module) to ensure the air/fuel mixture remains stoichiometric (ideal). This is achieved by mechanically adjusting the vanes in the charger, which regulate the amount of boost (intake pressure) delivered to the chamber. A malfunction in the boost control component can lead to drivability issues. When the ECM loses control of the boost, the vehicle typically enters “limp” mode to prevent engine damage caused by over/under-boost conditions that can result in a potentially damaging rich or lean air/fuel mixture.
The letter “B” in this context may be used to distinguish a connector, wire, circuit group, or other component. The manufacturer’s specifications are the best resource for determining the specific meaning in this case.
The ECM triggers the check engine light (CEL) and displays the P005F code and related codes when it detects a fault in the boost control system.
The P005F DTC is activated when the ECM detects a higher than expected electrical value in the “B” boost control supply voltage circuit.
A turbocharger and related components:
What is the severity of this DTC?
The severity is classified as moderate-high. When there is a problem in the forced induction system, it can potentially alter the air/fuel ratio. Ignoring or neglecting this issue can lead to significant engine damage. Additionally, the vehicle’s fuel efficiency will be negatively affected. Therefore, it is strongly recommended to address any faults in the forced induction system promptly.
What are some of the symptoms of the code?
Symptoms of a P005F trouble code may include:
What are some of the common causes of the code?
Possible causes for the P005F code include:
What are some P005F troubleshooting steps?
Basic Step #1
It is important to note that forced induction systems generate a significant amount of heat and can cause severe burns if the engine is cool and proper protection is not used. With that in mind, visually locate the boost control solenoid. Typically, it is mounted directly on the charger, although this may not always be the case. Once located, ensure that its mechanical functionality is in good condition.
This is crucial because the solenoid mechanically controls the charger and boost pressures. If you can manually move the lever from the solenoid to the charger housing, it is a positive sign. However, in some systems, this may not be possible.
Basic Step #2
In some cases, these solenoids have adjustable levers that help find the optimal position. However, this can vary significantly between manufacturers, so it is important to conduct thorough research beforehand.
NOTE: Be as non-invasive as possible during this step to avoid damaging expensive charger components.
Basic Step #3
Depending on the specific setup, the module may be mounted directly on the boost control as an assembly. If this is the case, check for any signs of water intrusion. If there is any corrosion, water damage, or other signs of damage, the assembly (or, if possible, just the module) will likely need to be replaced.
Basic Step #4
Pay close attention to the harnesses connected to the boost control solenoid. These harnesses are routed in close proximity to high levels of heat. Most of the time, if heat damage is present, it will become evident early on in the troubleshooting process.
Professional Service
We always recommend seeking professional mechanical assistance to resolve this issue. However, if for some reason that is not possible, we offer the option to permanently delete this specific DTC. All other codes will continue to be addressed. If you are interested in this option, please upload your ECU file to our portal.
