P266E "A" Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic (Bank 2)

P266E describes a bank 2 position signal from actuator A that flickers: brief dropouts or spikes appear while the reading is otherwise fine. Heat cycling near the exhaust side, vibration on a loose pin or a harness rubbing on a bracket can produce it, and it often comes and goes. No manufacturer documents P266E publicly. CARB expects lift system inputs to be checked for continuity and rationality, which includes such short interruptions. A jumping signal makes the lift control on bank 2 unsteady or forces it to a default position, felt as hesitation or uneven running. Logging the sensor value while flexing the harness on that bank is the usual way to catch it.

Likely causes

Symptoms

• MIL comes and goes
• Hesitation or uneven running
• Fault often not present at the workshop

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, en.wikipedia.org.