P005F Trouble Code: Meaning, Causes, Symptoms, and Technical Description

What does the P005F trouble code mean?

The P005F trouble code, applicable to all car manufacturers, means “Turbocharger/Supercharger Boost Control B Supply Voltage Circuit High“.

Background Information: A turbocharger uses the inertial force of the exhaust gases from the engine to drive a turbine, which in turn drives a coaxial impeller to pressurize the intake air, thereby increasing the car’s power. A supercharger is an air compressor used to increase the intake air to an internal combustion engine. More intake air provides the engine with more oxygen, allowing the control module to supply more fuel, thus increasing power output. The turbo/supercharger boost controller’s function is to control the boost level by using air pressure to push the wastegate actuator (pneumatic-mechanical) to bypass some of the exhaust gases around the turbine when the boost pressure reaches a set value, thereby reducing the turbine speed. This trouble code indicates that the turbo/supercharger boost control B supply voltage is higher than the calibrated maximum value.

What are the symptoms of a P005F code?

Symptoms of a P005F trouble code may include:

• Low, unstable, and/or abnormal power
• Poor overall driving performance
• Reduced throttle response
• Difficulty driving uphill
• Vehicle entering “limp mode” (i.e., fail-safe)
• Intermittent driving symptoms

What are the common causes of a P005F code?

Causes of a P005F code may include:

• Defective or damaged boost control solenoid (e.g., lever stuck, broken, bent, etc.)
• High resistance due to corrosion (e.g., connectors, pins, ground, etc.)
• Wiring problems (e.g., wear, open circuit, short to power, short to ground, etc.)
• ECM (Engine Control Module) internal problems
• Excessive exhaust soot in the turbocharger blades, leading to stagnant, low, or incorrect boost levels
• Boost control module problems
• Exhaust leaks

How to diagnose P005F?

Here are some suggested troubleshooting steps to fix the P005F error code:

1. Use an OBD2 scanner to read all stored data and trouble codes.
2. Clear the trouble codes from the computer’s memory and test drive the vehicle to see if the P005F error reappears.
3. Check the boost control solenoid. Test the boost control module.
4. Check the blades for debris and clean if necessary.
5. Check connectors and wiring for damage, looseness, and corrosion.
6. Check the PCM module.

How to Fix or Reset OBD-2 Code P005F

P005F is a diagnostic trouble code (DTC) indicating a problem with the turbocharger/supercharger boost control B power supply circuit. This code specifically relates to an excessively high voltage level.

1. Check Wiring: Inspect the wiring harness and connectors associated with the turbocharger/supercharger boost control type B power supply circuit. Check for damaged, loose, or corroded connectors. Repair or replace any faulty wiring as needed.
2. Check Boost Control Solenoid: Inspect the boost control solenoid for signs of damage or malfunction. Ensure it is receiving the correct voltage signal. If the solenoid is faulty, replace it with a new one.
3. Test Power Supply: Use a multimeter to measure the voltage output of the boost control B power supply circuit. It should typically be around 5 volts. If the voltage reading is too high, there may be a problem with the power supply. Check the relevant fuses and relays and replace them if necessary.
4. Clear the Fault Code: After completing any repairs or replacements, clear the fault code using an OBD-II scanner or by disconnecting the vehicle’s battery for a few minutes. This will reset the vehicle’s computer system.

If the fault code persists after following these steps, it is recommended to seek further assistance from a qualified technician or dealership. They will have the necessary diagnostic equipment to accurately pinpoint and resolve the problem.

Which Vehicles Are Most Commonly Affected by the P005F Code?

The P005F fault code can appear on various vehicles, but statistics show that it is most common in certain brands. Here are some of them:

• Chevrolet
• Dodge
• Ford
• GMC
• Isuzu
• Iveco (Daily)
• Land Rover
• Volkswagen

The P005F code is sometimes accompanied by other errors. The most common are: P003B, P004A, P004B, P004C, P004D, P004F, P005E, P00B0.