Technical Description of OBD-II Trouble Code
High Voltage Circuit Detected in Turbocharger/Supercharger Boost Control A Supply
What does that signify?
This is a generic diagnostic trouble code (DTC) that pertains to OBD-II vehicles. This includes 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 (e.g., exhaust pulses, belt-driven screw-type) to increase the amount of air introduced into the combustion chamber, thereby improving volumetric efficiency.
Forced induction systems require variable intake pressures to meet the operator’s power demands. Manufacturers incorporate a boost control valve (also known as a waste-gate, boost control solenoid, etc.) that is monitored and controlled by the Engine Control Module (ECM) to maintain an ideal air/fuel mixture. The boost control valve adjusts 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 harmful rich or lean air/fuel mixture.
The letter “A” in this context may be used to distinguish a connector, wire, circuit group, etc. The manufacturer’s specifications are the best resource for further clarification.
The ECM triggers the check engine light (CEL) and displays the P006F code and related codes when it detects a fault in the boost control system.
The P006F DTC is activated when the ECM detects a higher than expected electrical value in the “A” boost control supply voltage circuit.
A turbocharger and related components:
What is the severity of this DTC?
The severity is classified as moderate-high. A problem in the forced induction system can alter the air/fuel ratio, potentially causing significant engine damage if ignored or left unaddressed. In addition to the risk of damaging internal engine components, the vehicle’s fuel efficiency will also be negatively affected. Therefore, it is strongly recommended to repair any faults in the forced induction system.
What are some of the symptoms of the code?
Symptoms of a P006F trouble code may include:
What are some of the common causes of the code?
Possible causes for the P006F code include:
What are some troubleshooting steps for the P006F code?
Basic Step #1
It is important to note that forced induction systems generate a significant amount of heat, which 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, which is typically mounted directly on the charger. Ensure that its mechanical functionality is in good condition.
This is crucial because the solenoid 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, please note that in some systems, this may not be possible.
Basic Step #2
In some cases, the solenoids may have adjustable levers that help find the optimal position. However, this varies 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 your specific setup, the module may be mounted directly on the boost control as an assembly. 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 in the troubleshooting process.
