P22C5 code meaning
Turbocharger Compressor Outlet Valve Control Circuit/Open
Powertrain system Generic code P22xx codes Check engine light
What P22C5 means
P22C5 flags an open or broken drive circuit for the turbocharger compressor outlet valve. That valve sits in the charge-air path downstream of a compressor and decides whether this compressor feeds the engine, for example in register or two-stage charging or next to an electric auxiliary compressor. While the output is switched off, the engine control module compares the voltage on its driver with the level expected for an intact load; a reading typical of a cut wire or an unplugged connector sets the code. California OBD rules treat such boost actuators as monitored output components. No manufacturer publicly documents P22C5 itself; Mercedes-Benz uses the related stuck codes P22C8 and P22C9 on the M256 engine. With the valve unpowered, the module usually limits boost and power.
P22C5 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P22C5
- Check engine light on
- Reduced power because boost is limited
- Weak or delayed pull at the speed where the second boost path should join
Common causes of P22C5
- Most likelyValve connector loose, unplugged or corroded
- PossibleBroken wire in the valve harness, often near hot turbo parts
- PossibleOpen actuator coil inside the compressor outlet valve
- Less likelyFaulty output stage in the engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
TurbochargerDiverter valve
What each part of P22C5 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| C5 | The exact fault in that area. |
What to do next
- Note P22C5 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 P22C5
What does P22C5 mean?
P22C5 means "Turbocharger Compressor Outlet Valve Control Circuit/Open". P22C5 flags an open or broken drive circuit for the turbocharger compressor outlet valve. It is a generic code, so it means the same on every make.
Is it safe to drive with P22C5?
Drive gently and only to a workshop. With P22C5 the car can go into limp mode (reduced power) to protect itself.
Will P22C5 fail an emissions test?
Yes, it can. P22C5 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 P22C5 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P22C5 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.