P266C "A" Rocker Arm Actuator Position Sensor Circuit Low (Bank 2)

P266C reports a bank 2 position sensor signal for actuator A that has fallen under its lower plausibility limit. Grounded signal wires, a missing sensor supply or an internal sensor short pull it down; a connector left half unplugged after other work on the harder-to-reach side of the engine is another possible trigger. No manufacturer documents P266C publicly, so there are no published thresholds. Under CARB's comprehensive component rules, such a range check is mandatory for sensors in a lift system. The controller then holds bank 2 at a safe fixed lift. The high-side partner is P266D, the bank 1 equivalent P264C.

Likely causes

Symptoms

• MIL on
• Bank 2 held at fixed lift
• Less pulling power

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.