P3475
Cylinder Deactivation Oil Pressure Switch Bank 1 Circuit
The engine control module has detected an electrical fault in the cylinder deactivation oil pressure switch circuit on bank 1. The switch confirms that hydraulic pressure has reached the level required to collapse the switching lifters; without a valid signal the system disables deactivation.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Oil pressure switch failedCommon
- Wiring short or openPossible
- Connector corrosionLess likely
Parts involved
- Oil Pressure Switch
- Engine Wiring Harness
- ECM
P3475 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.