P2646 - OBD II Trouble Code

Our automotive experts have put together the following information about the P2646 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P2646 code.

What Does P2646 Code Mean?

OBD-II Code P2646 is defined as a "A" Rocker Arm Actuator System Performance/Stuck Off

The Rocker Arm Control Solenoid supplies hydraulic pressure to the Variable Timing mechanism. This allows the Variable Timing System to adjust valve timing as needed. The engine's control module (PCM) uses the Rocker Arm Oil Pressure Switch to verify correct oil pressure for proper activation of the Variable Timing mechanism. If the PCM does not see the correct voltage signal back from the Rocker Arm Oil Pressure switch, the PCM will set code P2646.

P2646 Symptoms

• Decreased engine performance
• Increased fuel consumption

Common Problems That Trigger the P2646 Code

• Engine oil level is too low
• Powertrain Control Module (PCM) failure
• Rocker arm oil pressure sensor failure
• Wiring issue