Generic electrical fault on the cylinder deactivation/intake valve control circuit on bank 2.
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.
Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.
Most likely causes
- Deactivation solenoid failed
- Wiring break or unplugged connector
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 P340B means
- P: Powertrain: engine and transmission
- 3: Generic or manufacturer code, depending on the range
- 4: Emissions
- 0B: Specific fault in that system
Frequently asked questions
Can I keep driving with code P340B?
Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
What causes code P340B?
The most common causes are: deactivation solenoid failed; wiring break or unplugged connector.
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.