P05CE on Toyota: How to Diagnose & Fix

P05CE stands for "Cold Start 'B' Camshaft Position Timing Performance (Bank 1)." A generic OBD-II powertrain code. During the cold-start warm-up phase, the engine control module commands the 'B' camshaft (the second cam on bank 1, typically the exhaust cam on a dual-cam engine) to a specific position to speed catalyst light-off and cut emissions. P05CE sets when the actual measured cam position does not reach or follow the commanded position within the allowed window during that cold-start period. The car often drives normally once warm, so this frequently appears as a check engine light with a rough or slightly rattly cold start and a possible emissions test failure. On Toyota it is documented across 1 model: Grand Highlander.

The most common causes of P05CE are: Low, degraded, or wrong-viscosity engine oil restricting flow to the cam phaser, Clogged oil control valve (camshaft position actuator solenoid) screen, or a failed solenoid, Stretched timing chain or worn guides/tensioner altering cam timing, Failed 'B' camshaft phaser/actuator on bank 1 stuck or slow to move, Wiring or connector fault on the oil control valve circuit, Camshaft or crankshaft position sensor reporting inaccurate timing data, Outdated ECM calibration — some manufacturers address this code with a software update. The specific cause varies by vehicle.

Repair costs vary widely with the root cause and Toyota model; each issue on this page carries its own estimate where one is published.