P264C
A Rocker Arm Actuator Position Sensor Circuit Low Bank 1
The position sensor signal is below the lower diagnostic threshold. Usually a shorted sensor or short to ground in the harness.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Internal short in sensor elementCommon
- Signal wire shorted to groundPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Rocker Arm Position Sensor A B1
- Wiring Harness
P264C 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.