P2D19 code meaning
Exhaust Flow Control Valve C Position Circuit Low
Powertrain system Generic code P2Dxx codes Check engine light
What P2D19 means
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.
P2D19 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2D19
- Check engine light
- Flap C no longer adjusted, default position held
- Possible power reduction on engines that tie the flap to cylinder deactivation
Common causes of P2D19
- Most likelyFeedback wire shorted to ground
- PossibleMissing sensor supply voltage or open supply wire
- PossiblePosition sensor in actuator C failed low
- Less likelyFaulty evaluation logic in the engine software
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust flow control valve cWiring harnessECM
What each part of P2D19 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 19 | The exact fault in that area. |
What to do next
- Note P2D19 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2D19
What does P2D19 mean?
P2D19 means "Exhaust Flow Control Valve C Position Circuit Low". P2D19 is stored when the angle feedback from actuator C drops beneath the bottom of its permitted band. It is a generic code, so it means the same on every make.
Is it safe to drive with P2D19?
Drive gently and only to a workshop. With P2D19 the car can go into limp mode (reduced power) to protect itself.
Will P2D19 fail an emissions test?
Yes, it can. P2D19 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2D19 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2D19 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.