P006E Diagnostic Trouble Code: Turbocharger/Supercharger Boost Control “A” Supply Voltage Circuit Low

Fault code P006E is called “Turbocharger/Supercharger Boost Control “A” Supply Voltage Circuit Low” but in different programs it may be called differently. This fault designation applies to all vehicles equipped with OBD-II.

Technical description and explained code P006E

Stored fault code P006E indicates that the control module (PCM) has detected a problem in the turbocharger or supercharger system. In this case, the “A” supply circuit voltage of the engine supercharger is low.

P006E Diagnostic Trouble Code: Turbocharger/Supercharger Boost Control "A" Supply Voltage Circuit Low

In systems with forced induction, the inlet pressure must be varied and adjusted according to the power required at the time. This is done by using a boost regulating valve. This is monitored and controlled by the engine control module to provide the engine with the ideal fuel/air mixture.

This is accomplished by mechanically adjusting the turbocharger/charger blades. The blades are responsible for adjusting the amount of boost that delivers air into the combustion chamber. If the PCM loses control of the supercharger, it causes the engine to run erratically.

Fault code P006E is activated when the engine control module detects that a low supply circuit voltage is detected that is outside the desired range. Then, the controller turns on the check engine light (CEL). And the error is recorded in memory as a malfunction in the supercharger control system.

It may take several failure cycles for the MIL control lamp to turn on in the instrument panel.

Symptoms of vehicle malfunctions

The main signal that an error P006E has occurred is the Malfunction Indicator Lamp (MIL) is also known as the CheckEngine Light.

It can also be warning signs such as:

  1. The “Check Engine” control lamp on the control panel will light up (the code will be recorded in the memory as a malfunction).
  2. Floating revolutions, as well as attempts to stall at idle.
  3. Jerking/missing ignition at idle or under load.
  4. Engine cannot be accelerated, throttle response is unresponsive.
  5. Reduced engine power output.
  6. Increased fuel consumption.
  7. Increased noise of the engine, also a ringing and rattling may be present.
  8. The vehicle may go into emergency operation mode.

The severity level of fault code P006E ranges from medium to high, depending on the symptoms. This error should not be ignored, as you risk damaging internal engine components. Therefore, it is in your best interest to troubleshoot the forced induction system as soon as possible.

Factors that can cause this error code

The error code P006E can mean that one or more of the following problems have occurred:

  • Faulty or damaged charge control solenoid.
  • Corrosion causing high resistance in connectors or contacts.
  • Worn or shorted wiring.
  • Contamination in the form of soot on the turbocharger blades.
  • Exhaust gas leakage.
  • Problem with supercharger control module.
  • Sometimes the cause is a faulty PCM module.

How to fix or reset OBD-2 code P006E

Some suggested steps for troubleshooting and fix the error code P006E:

  1. Read all stored data and error codes with an OBD-II scan tool.
  2. Clear the error codes from the computer memory and test-drive the vehicle to see if error P006E appears again.
  3. Check the boost control solenoid.
  4. Test the supercharger control module.
  5. Inspect the blades for debris, clean if necessary.
  6. Test the connector and wiring for damage, looseness, and corrosion.
  7. Check the PCM module.

Diagnose and repair of problems

Turbines typically spin at incredible speeds of 100,000 to 150,000 rpm. They are intolerant to imbalance or a lack of clean oil in the bearing.

The diagnostic process for the P006E error is best started with the most common turbo problems. These will require tools such as a vacuum gauge and a dial gauge.

Checking the vacuum

Make sure the engine is running properly, with no ignition skips or codes related to a faulty detonation sensor. Then, check for leaks at the turbocharger outlet, intercooler, and throttle body.

Inspect the intake manifold for leaks of any kind, including vacuum hoses. Remove the lever from the throttle valve. Manually operate the valve, looking for a jammed valve causing a drop in boost.

Measuring boost pressure, turbocharger inspection

Locate the vacuum with no holes in the intake manifold and install a vacuum gauge. Start the engine. At idle the engine should have a vacuum of 1-1.5 atmospheres. If less than 1 atmosphere then the catalytic converter is defective and will not allow boost.

Quickly accelerate the engine to 5000 rpm and release the throttle, observing the vacuum gauge indicating the boost pressure. If the boost pressure rises above 1.3 atmospheres, then the bypass valve is bad.

Stop the engine and let it cool down. Remove the turbine exhaust hose and look inside to make sure the blades are not rubbing the housing. Look for bent or missing blades or oil in the turbocharger. Rotate the blades by hand, looking for resistance indicating turbocharger malfunction.

Inspect the oil lines from the cylinder block to the center bearing and the return line from the bearing to the oil pan for leaks. Place a dial gauge on the turbine outlet and rotate the turbine shaft. If the axial play exceeds 0.003, the center bearing is defective.

Solenoid and wiring

If after all the checks no problems are found, but code P006E has not disappeared, it is necessary to check the electrical components. The sensors and associated circuits should be tested.

Disconnect the wiring harness and test the control circuit. Make sure that 12 volts are present in the power circuit. They should show when the ignition is on. If they are not, or if they are present when the ignition is off, repair the wiring from the PCM to the sensor.

Check that the valves are securely grounded. Connect the test lamp to the plus side of the battery, and touch the other end to the valve ground circuit. If the pilot light does not come on, it indicates a faulty circuit.

On which vehicles does this problem occur most frequently

Fault code P006E can occur on different vehicles but there are statistics on which brands this occurs most often. Here is a list of some of them:

  • Chevrolet
  • Dodge (RAM)
  • Ford
  • GMC
  • Honda
  • Hyundai
  • Isuzu
  • Kia
  • Mazda (CX-5)
  • Volkswagen
  • GAZelle (Cummins, Next)

Fault code P006E can sometimes be found with other errors. The most common are the following: P003A, P006F, P00AF.

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