P340A
Deactivation/Intake Valve Control Circuit Bank 1
Generic electrical fault on the cylinder deactivation/intake valve control circuit on bank 1. The mechanism that switches off intake valves on selected cylinders cannot be commanded.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Deactivation solenoid failedCommon
- Wiring break or unplugged connectorPossible
Parts involved
- Cylinder Deactivation Solenoid
- Actuator Wiring
P340A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.