P006E — Turbocharger/Supercharger Boost Control "A" Supply Voltage Circuit Low

powertrain (engine/transmission)

Is it safe to drive?

Reduced boost may be present P006E can cause the controller to limit boost or reduced-power operation, so heavy acceleration and towing should be avoided until the voltage fault is corrected. If low system voltage, severe misfire, stalling, or other major running problems accompany the code, stop driving and arrange service.

Typical symptoms

The check-engine light may illuminate with P006E stored in the powertrain control module.
Measured boost may remain lower than the boost requested by the engine controller.
Acceleration can feel sluggish or reduced, particularly when substantial engine torque is requested.
Boost response may be delayed or inconsistent, and the boost gauge may read unusually low.
The vehicle may enter a reduced-power or fail-safe mode even though P006E concerns the actuator supply circuit.
Some vehicles drive normally when the low-voltage condition is brief, making P006E appear intermittent.

Common causes

Low battery or charging-system voltage can pull the boost-control actuator supply below its specified operating range and trigger P006E.
An open or high-resistance section in the boost control "A" supply wire can reduce voltage at the actuator.
A short to ground in the control-supply wiring can continuously depress the voltage and store P006E.
A blown fuse, damaged power feed, or defective relay can interrupt or weaken the boost-control actuator supply.
Corroded connector terminals, water intrusion, or a poor actuator or module ground can create an intermittent low-voltage condition.
Internal circuitry failure in the boost-control actuator or electronic boost-control solenoid can cause P006E even when the wiring is intact.
An improperly installed aftermarket boost controller or damaged aftermarket harness can overload or ground the OEM control circuit.

How to diagnose with an OBD scanner

Confirm P006E with an OBD2 scanner Connect an ELM327 adapter using AIScanAuto or another OBD2 scanner, then confirm that P006E is present and review its freeze-frame data. Record battery voltage and any displayed boost-command or actual-boost data; generic scanners may not expose circuit-level readings.
Check battery, charging system, fuses, and grounds Test battery voltage and charging output under the conditions specified by the manufacturer. Inspect the relevant fuse, power-feed relay, actuator ground, and engine or body grounds. A healthy supply at the battery does not guarantee correct voltage at the boost controller.
Inspect the boost-control wiring and connector Examine the harness between the powertrain controller and the boost control "A" actuator or solenoid. Look for corrosion, loose pins, backed-out terminals, chafing, pinched insulation, water, or heat damage, and repair damaged connections before replacing components.
Measure circuit voltage and continuity Using the correct wiring diagram and pin identification, back-probe the actuator supply while the circuit is active under manufacturer-specified conditions. Compare the reading with the required supply voltage. With power removed, perform the specified continuity or short-to-ground test to locate resistance or a short.
Repair and verify the fault Correct the wiring, connector, fuse, relay, or ground fault and confirm that proper voltage now reaches the actuator. If the voltage remains low with intact wiring, follow the manufacturer procedure for testing the boost-control actuator and powertrain module. Clear P006E, road-test the vehicle, and verify that boost follows command without the code returning.

Approximate repair cost

Typical independent-shop cost for diagnosing and repairing P006E is approximately $150-$1,200 USD, depending on whether the fault is a fuse or ground issue, damaged wiring, or a failed boost-control actuator. These figures are estimates and vary by region, vehicle design, and parts availability.

Common questions

What does P006E specifically mean?

P006E means the powertrain controller detected that the boost control "A" supply voltage was below the specified level. It identifies a low-voltage electrical condition, not necessarily a damaged turbocharger.

Does P006E prove that the turbocharger is defective?

No. A restricted or leaking turbo system more commonly produces underboost, overboost, or boost-control response codes. P006E points first toward the actuator supply, wiring, grounds, fuse, or voltage reference.

Can I drive the vehicle with P006E active?

You can often drive cautiously, but boost may be limited and engine performance may be reduced. Avoid demanding acceleration until the circuit has been tested and repaired, particularly if battery voltage is low or the fault is intermittent.

Can an ELM327 scanner diagnose the P006E circuit?

An ELM327 scanner can confirm P006E and may provide freeze-frame or battery-voltage information. Determining why the supply is low usually also requires the correct wiring diagram, a digital multimeter, and a physical inspection of the actuator circuit.

When your vehicle's engine computer detects a problem with the voltage supply feeding the turbocharger or supercharger boost system, it logs OBD2 trouble code P006E. This specific code — defined officially as "Turbocharger/Supercharger Boost Control 'A' Supply Voltage Circuit Low" — belongs to the powertrain category, meaning it directly affects engine and transmission operation. The ECU expects a specific voltage level on this circuit to properly regulate boost pressure; when that voltage drops closer to ground than it should, the module flags P006E and illuminates the Check Engine light.

Under the hood, forced-induction systems rely on precise electrical signals to control wastegates, bypass valves, and variable-geometry components. The boost control circuit "A" supply provides power to these actuators. A short to ground — caused by damaged wiring, corrosion at connectors, or failed components — prevents the system from receiving adequate voltage. The engine control module continuously monitors this circuit while you drive. Once readings stray outside acceptable parameters for the programmed number of drive cycles, P006E gets stored alongside freeze frame data capturing the exact engine conditions at failure: RPM, load, temperature, and vehicle speed. That snapshot becomes your roadmap for diagnosis.

The good news is that P006E rarely appears alone. Associated fault codes typically point toward the root cause, whether it's a mechanical boost leak, an electrical short, or a failing turbocharger component. Understanding what triggers this code requires checking both the electrical supply side and the mechanical boost side of your forced-induction system.

Common Symptoms of P006E

Noticeable reduction in engine power, especially under acceleration
Illuminated Check Engine warning lamp on the dashboard
Dark smoke billowing from the exhaust during hard throttle input
Unusual high-pitched whistling or siren-like sounds emanating from the engine bay
Vehicle stuck in limp-home mode, limiting RPM and throttle response
Elevated oil consumption as the turbo works harder to compensate for lost boost

What Causes P006E?

The most frequent culprit behind P006E is insufficient supply voltage reaching the boost control circuit. This typically stems from wiring damage — chafed insulation allowing a short to ground — or connectors weakened by corrosion and moisture intrusion. Beyond electrical issues, mechanical problems can also drag the circuit low or create the conditions that trigger the code.

Damaged wiring harness with exposed conductors shorting to metal ground
Corroded or loose electrical connectors at the turbocharger boost control
Failed boost control solenoid drawing excessive current and pulling voltage down
Malfunctioning wastegate actuator or stuck wastegate flapper
Defective boost pressure sensor sending erroneous readings to the ECU
Worn or damaged turbocharger bearings causing mechanical drag
Cracked vacuum lines or actuator hoses leaking boost pressure
Boost leaks at intercooler piping, silicone hoses, or coupling clamps
Restricted intake airflow or clogged exhaust aftertreatment components (DPF/catalytic converter)

How to Diagnose P006E

Effective diagnosis follows a logical path from electrical basics to mechanical verification. Rushing to replace expensive parts before confirming the actual fault wastes money and time.

Connect an OBD2 scanner, retrieve stored P006E codes, and record all freeze frame data — note engine RPM, load percentage, coolant temperature, and vehicle speed recorded when the failure occurred. This tells you exactly what conditions triggered the fault.
Search for any manufacturer technical service bulletins (TSB) specific to your vehicle make, model, and model year. Many P0xxx codes have documented factory fixes, software updates, or known component weaknesses. Check the NHTSA database or your manufacturer's official service website using your VIN.
Perform a thorough visual inspection of all wiring and connectors tied to the turbocharger boost control system. Look for damaged insulation, rubbed-through wires, melted sections near heat sources, green corrosion buildup, or connectors that are loose, backed out, or water-damaged.
Measure supply voltage at the boost control "A" connector with the key on engine off — it should read close to battery voltage. Next, check resistance from the signal wire to chassis ground; a reading near zero ohms confirms a short to ground in the harness.
Pressurize the intake tract with a boost leak tester to identify cracked intercooler hoses, slipped clamps, or deteriorated seals. Boost leaks are among the most common causes of boost-related fault codes.
Use a scanner to command the boost control solenoid on and off while listening for mechanical clicks and observing wastegate or actuator movement. No response indicates electrical failure or mechanical binding.
Clear the code, then drive the vehicle through a complete drive cycle replicating the freeze frame conditions. If P006E returns, the fault is still active and requires further investigation.

Repair Options and Costs

Addressing P006E means tackling whatever is pulling the supply voltage low. Repair strategies range from simple hose replacements to full turbocharger overhauls. Always start with the least expensive, most common repairs before considering component replacement.

Repair boost leak (replacement hoses, clamps, intercooler patching): $100–$400
Replace boost control solenoid or actuator: $200–$600
Turbocharger assembly replacement: $1,200–$3,500

Labor rates at independent shops typically run $75–$125 per hour. Wiring harness repair or connector replacement may add $150–$300 in labor depending on accessibility. Software reflashes, if required by a TSB, usually cost $100–$200 at a dealership.

Driving Safety Verdict: Caution

P006E indicates a significant boost system fault. Your vehicle may enter limp-home mode, severely restricting power output to protect the engine from damage. Continuing to drive aggressively with compromised boost can lead to excessive exhaust gas temperatures, oil degradation, and ultimately catastrophic turbocharger failure. A new or rebuilt turbo runs $1,200–$3,500 installed — far more than the cost of early diagnosis and repair. Drive gently, minimize full-throttle acceleration, and schedule diagnostic testing promptly. Once the underlying cause is identified and corrected, P006E will clear after a successful drive cycle verification.