Powertrain
Definition only
Lights the check engine lamp
P266B: A Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P266B mean?
The position sensor reading does not transition cleanly between the two valve lift modes for actuator A on bank 2.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- Medium Sensor signal drift after thermal aging
- Medium Worn lock pin reduces travel between modes
- Low Sensor element aged beyond calibration window
Likelihood is a general estimate across vehicles; your make and model may differ.
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P266B in the community
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