Powertrain, generic (extended)

P265B "B" Rocker Arm Actuator Position Sensor Circuit Range/Performance (Bank 1)

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

Toyota documents this code on Valvematic engines, where an electric lift controller turns a shaft that alters rocker geometry and reports its angle back. P265B is set when that feedback stays electrically valid but does not track the target. Bulletin T-SB-0011-14 (2014 Corolla, 2ZR-FAE) pairs it with P2646 and fixes it by reflashing the ECM. T-SB-0098-19 (2018–19 C-HR with 3ZR-FAE, 2020 Corolla with 2ZR-FAE) adds the Valvematic angle codes P10A0 and P1055 and replaces the lift controller if the code returns. Both start with a learn value reset and an engine-off active test in which the actual angle should drop to about 105–106° and climb above 108°. CARB demands that such systems recognise deviations from the target and sluggish reaction.

Likely causes

Outdated ECM calibration (Toyota 2014 Corolla)

Continuously variable lift controller sticking or worn

Stored learn values no longer match the mechanism

Drifting angle sensor in the controller

Symptoms

MIL on, often together with P2646
Reduced power and slower throttle response
Fault may return after a short rev to 3,500 rpm

Repair estimate

DifficultyHardWorkshop job

Parts and labour€100–1,500

Time0.5–4 h

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

Parts involved

rocker arm position sensor b b1actuator mechanism

Related codes

P265A P2646 P264B P265C P265D

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