P266D Possible Causes
- Low or overfilled engine oil
- Incorrect engine oil type
- Faulty rocker arm actuator sensor ‘A’
- Rocker arm actuator sensor ‘A’ circuit open or shorted
- Poor electrical connection in rocker arm actuator sensor ‘A’ circuit
How to Fix Code P266D
Check the “possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
Check engine light illuminated (or service engine soon warning light)
P266D Meaning
The Engine Control Module (ECM) commands the rocker arm actuator to control the hydraulic oil circuit. Oil flows through the rocker arm actuator to the variable valve timing system to adjust engine valve timing. The variable valve timing (VVT) system is used to improve engine performance, fuel economy, or emissions. The ECM monitors the rocker arm actuator position sensor ‘A’ and sets OBDII when the rocker arm actuator position sensor ‘A’ signal is outside factory specifications.