Powertrain
Definition only
Lights the check engine lamp
P266A: A Rocker Arm Actuator Position Sensor Circuit Bank 2
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P266A mean?
The position sensor that confirms the A rocker arm switching state on bank 2 returns no usable signal.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Open sensor element
- Medium Corroded sensor connector
Likelihood is a general estimate across vehicles; your make and model may differ.
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P266A in the community
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