The ECM detects that crankcase ventilation hose A is disconnected based on pressure or vacuum signals. Unmetered air ingress and oil mist escape are possible.
Medium severity. Can I keep driving?You can drive in moderation. If oil consumption increases or there are leaks, check the level often and go to a repair shop soon.
Most likely causes
- Hose disconnected at fitting
- Hose split or perforated
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: easy
- It affects emissions.
What each character of P2C90 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- C: Subsystem depends on the code range
- 90: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2C90?
You can drive in moderation. If oil consumption increases or there are leaks, check the level often and go to a repair shop soon.
What causes code P2C90?
The most common causes are: hose disconnected at fitting; hose split or perforated.
Related codes
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.