The engine control module has detected a performance fault on the cylinder 4 deactivation or intake valve control system — the actuator response does not match the commanded state.
Medium severity. Can I keep driving?Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
Cylinder 4 is numbered according to the manufacturer: check your engine's manual before working on it.
Most likely causes
- Lifter stuck collapsed
- Engine oil pressure too low
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It affects emissions.
What each character of P3426 means
- P: Powertrain: engine and transmission
- 3: Generic or manufacturer code, depending on the range
- 4: Emissions
- 26: Specific fault in that system
Frequently asked questions
Can I keep driving with code P3426?
Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
What causes code P3426?
The most common causes are: lifter stuck collapsed; engine oil pressure too low.
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.