Powertrain, generic (extended)

P22D6 Turbocharger Turbine Inlet Valve Position Sensor Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22D6 is set when the position sensor signal of the turbine inlet valve falls below its lowest valid voltage. Position sensors on such actuators normally work on a 5-volt reference with a signal that never reaches the rails in normal use, so a reading near zero means a lost reference, a signal wire shorted to ground or an internal sensor fault rather than a real valve position. The engine control module flags this electrically and quickly, without needing a test drive. It then ignores the reading and usually parks the valve in a safe position with reduced boost. Two-stage patents from Ford and GM describe exactly this kind of position feedback on the turbine bypass valve. No manufacturer publicly documents P22D6. Check the reference voltage at the plug first.

Likely causes

5-volt reference open or pulled down by another shorted sensor
Signal wire shorted to ground
Internal failure of the position sensor

Symptoms

  • Check engine light on
  • Reduced power, valve in fallback position
  • Other sensor codes on the same reference circuit possible

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–1,200
Time0.5–3 h

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

Parts involved

turbine inlet valve

Related codes

P22D4P22D7P22D5P22D8

References: patents.google.com, patents.google.com, law.cornell.edu.