Fuel and air

P006F — Turbo/Supercharger Boost Control A Supply Voltage Too High

Severity: medium Drive with care, to a shop

What P006F means

P006F means the engine control module detected a voltage higher than expected in the supply circuit 'A' for turbocharger or supercharger boost control. This circuit powers the solenoid or electric actuator that regulates boost pressure. When the voltage is out of range, the module can't control boost accurately and usually limits engine power.

Symptoms

  • Check Engine light on
  • Reduced or erratic engine power
  • Sluggish throttle response
  • Limp mode with limited power
  • Poor fuel economy
  • Unusual turbocharger noise

Possible causes

  1. Damaged or corroded wiring or connectors in the boost control circuit
  2. Faulty boost control solenoid or turbo actuator
  3. Supply or signal wire shorted to battery voltage
  4. Poor power supply or ground to the PCM
  5. Faulty actuator position sensor or a sticking variable geometry mechanism
  6. Failed PCM (rare)

How to diagnose

  1. Scan all codes and freeze frame data, clear the code, and see if it returns.
  2. Inspect the wiring and connectors at the solenoid or actuator for chafing, heat damage, corrosion, or moisture.
  3. Measure supply voltage at the connector with the ignition on and compare it to the spec.
  4. Check PCM power and grounds, plus battery condition and terminals.
  5. Test the circuit wires for opens and shorts to voltage.
  6. Compare commanded and actual boost in live data.
  7. Command the actuator or valve through its full range with a scan tool.
  8. Inspect vacuum hoses and charge-air piping for leaks.

Common fixes

  • Repair or replace damaged wiring and connectors
  • Replace the boost control solenoid or turbo actuator
  • Fix PCM power or ground circuit problems
  • Clean or replace a sticking variable geometry mechanism
  • Replace or reprogram the PCM only after everything else is ruled out

Questions and answers

Can I drive with a P006F code?

Short trips are usually possible, but power will likely be limited. Avoid heavy loads and get it checked soon to avoid damaging the turbo.

What most often causes P006F?

Most often it's damaged wiring or a connector in the boost control circuit, or a failing solenoid or actuator. Start with a wiring inspection and a voltage check at the connector.

Do I need a new turbo for P006F?

Usually not. The code points to the electrical circuit, so check wiring, power, and the actuator first. Replace the turbo only if a mechanical failure is confirmed.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.