Powertrain, generic · Fuel and air metering, auxiliary emission controls

P006E Turbocharger/Supercharger Boost Control A Supply Voltage Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

"Boost control A" is the electrically driven actuator the engine control module uses to set boost pressure, for example a wastegate solenoid, the control valve of variable turbine vanes or an electric actuator. Some engines supply it through two driver stages in the control module: a high side that switches the supply voltage and a low side that switches ground. The low side is covered by P0045 to P0048; this code concerns the high side. P006E is set when the switched supply voltage is too low, typically because the supply wire is shorted to ground or interrupted. Without supply the actuator stays in its rest position, which on most engines means low boost and reduced power.

Likely causes

Supply wire shorted to ground or interrupted
Connector at the actuator corroded or loose
Internal short in the actuator
High-side driver in the engine control module faulty

Symptoms

  • Check engine light on
  • Loss of power or reduced power mode
  • Weak acceleration, noticeable turbo lag

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–900
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

boost control actuator aboost control actuator supply wiringengine control module

Related codes

P006FP0045P0047P0048P005E

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org, en.wikipedia.org.