Powertrain, generic (extended)

P265D "B" Rocker Arm Actuator Position Sensor Circuit High (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P265D stands for a feedback signal from position sensor B, bank 1, that sits above its valid ceiling. A reading pinned near the supply voltage usually means the signal is no longer pulled toward a real value: the sensor ground has opened, the signal wire touches a reference or battery line, or moisture has bridged pins in the plug. Because such a value would describe a position the actuator cannot reach, the controller discards it and holds lift at a default. CARB requires out-of-range high detection for every input of a variable lift system. No manufacturer publishes P265D; Toyota's public Valvematic bulletins mention only P265B for this sensor. Check ground continuity first, then the connector. Low side: P265C; intermittent faults: P265E.

Likely causes

Open ground wire of position sensor B
Signal wire shorted to the 5 V reference or battery voltage
Moisture bridging pins in the sensor plug

Symptoms

  • MIL on
  • Lift frozen at default, weaker acceleration

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–1,200
Time0.5–4 h

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

Parts involved

rocker arm position sensor b b1wiring harness

Related codes

P265AP265CP265EP264D

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