Code result
P264B
A Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 1
Moderate severity
What it means
The position sensor reading does not transition cleanly between the two valve lift modes on bank 1. Sensor drift or mechanical wear leaves the signal between expected values.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Sensor signal drift after thermal aging
mediumA plausible cause — test and verify before replacing parts.
Worn lock pin reduces travel between modes
mediumA plausible cause — test and verify before replacing parts.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Related help
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