Powertrain, generic (extended)

P2D19 Exhaust Flow Control Valve C Position Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2D19 is stored when the angle feedback from actuator C drops beneath the bottom of its permitted band. With an analog sensor the line then reads close to zero volts, mostly through a ground short or a lost 5 V supply; with a PWM return the duty cycle hangs close to zero. No manufacturer documents P2D19. The nearest public examples belong to valve A: in bulletin 01-004/20 Mazda links P2BF6 to a low reading from the shutter valve sensor on its cylinder deactivation engine, curing it with new PCM software, and Deutz MD1 engines store P2BF6 when flap voltage falls too low. In GM's 23OBDG07 tables an exhaust valve feedback under 2 percent duty cycle fails after 4 seconds. If flaps share a sensor supply, a low on several of them points to that reference rather than to sensor C.

Likely causes

Feedback wire shorted to ground
Missing sensor supply voltage or open supply wire
Position sensor in actuator C failed low
Faulty evaluation logic in the engine software

Symptoms

  • Check engine light
  • Flap C no longer adjusted, default position held
  • Possible power reduction on engines that tie the flap to cylinder deactivation

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–900
Time0.5–2.5 h

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

Parts involved

exhaust flow control valve cwiring harnessecm

Related codes

P2D17P2D18P2D1AP2BF6P2BFE

References: static.nhtsa.gov, serdia.deutz.com, gsi.ext.gm.com, law.cornell.edu.