P3493
Cylinder Deactivation Position Sensor Bank 2
The engine control module has detected an implausible signal from the bank 2 cylinder deactivation position sensor. The sensor confirms switching lifter position; without a valid signal the module cannot safely command deactivation transitions on bank 2.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Position sensor failedCommon
- Wiring or connector faultPossible
- Lifter mechanically stuckLess likely
Parts involved
- Position Sensor
- Engine Wiring Harness
- ECM
P3493 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.