Cylinder Deactivation System Bank 1
Your engine is having a problem with the system that turns some cylinders off during light driving. The computer has detected a fault on bank 1 and stores code P3400. This can cause poor fuel economy, rough running, or a check engine light.
The vehicle is usually drivable, but the engine may run rough or use more fuel. If the engine misfires badly, loses power, or makes unusual noises, stop driving and diagnose it soon.
P3400 sets when the powertrain control module detects a malfunction in the cylinder deactivation system for bank 1. Depending on the engine, this may involve valve lifters, oil control solenoids, wiring, oil pressure, or the control module failing to command cylinder shutdown correctly. The fault may be electrical, mechanical, or related to engine oil condition or pressure.
It is usually a moderate issue, but it can become serious if it is caused by low oil pressure or internal engine damage.
Bank 1 is the side of the engine that contains cylinder number 1.
Yes. Low oil level, dirty oil, or the wrong oil can prevent the cylinder deactivation system from working correctly.
Sometimes it will, if the oil is low, dirty, or the wrong type. If the fault remains, more diagnosis is needed.