Powertrain, generic (extended)

P265A "B" Rocker Arm Actuator Position Sensor Circuit (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Lift systems that move the rocker geometry with an electric motor, such as Toyota Valvematic, need a sensor that tells the engine controller the actual adjustment angle. P265A flags a general electrical problem with the feedback sensor that reports where actuator B on bank 1 sits: the controller sees no usable signal but cannot classify it as simply too low or too high. Toyota's own bulletins place a Valvematic feedback complaint under the neighbouring B sensor code P265B, which shows Toyota uses this sensor letter; P265A itself is not documented publicly by any manufacturer. CARB requires circuit checks on all inputs of a valve lift system. A loose connector, a broken reference or ground wire, or a sensor failure are the likely reasons; P265B to P265E narrow the fault down.

Likely causes

Loose or corroded connector at the B position sensor
Open 5 V reference or sensor ground wire
Failed position sensor inside the lift controller

Symptoms

  • MIL on
  • Lift held at a fixed value, sluggish response
  • Higher fuel consumption

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

P265BP265CP265DP265EP264AP2650

References: law.cornell.edu, en.wikipedia.org, static.nhtsa.gov.