P2646 CADILLAC code

Code P2646 is a code for the ‘A’ rocker arm control circuit performance problem. When the system is not working correctly, the rocker arms are not moving to the different position causing a low power situation.

What does the rocker arm actuator do?

The rocker arm actuator is an oil pressure switch which controls the flow of oil to critical upper engine cylinder head components.

What is a rocker arm actuator system performance?

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.

What does a rocker arm actuator look like?

Zitat von Youtube: The function of the rocker arm actuator is to control the flow of engine oil to the top end of the engine. And provide lubrication to the rocker arm.

What is a rocker arm oil control solenoid?

In vehicles equipped with VTEC, the rocker arm control solenoid supplies hydraulic pressure to the variable timing and lift mechanism. This allows the VTEC system to adjust valve timing and lift as needed. The VTEC system controls the rocker arm control solenoid through the powertrain control module (PCM).

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How do I fix error code P2646?

What repairs can fix the P2646 code?

  1. Replacing the ‘A’ rocker arm actuator.
  2. Repairing the wiring harness or connector to the actuator.
  3. Changing the oil and filter to the correct viscosity oil.
  4. Flush the engine passages of sludge from lack of oil changes.


How much does it cost to fix rocker arm actuator?

Because rocker arm repair is tedious work, it can be time intensive so hiring an auto mechanic or dealership to do the job is not cheap. Expect to pay anywhere from $500 to $1,500 (parts + labor) depending on the vehicle. A good chunk of the expense is for labor as it can take a long time to access the necessary parts.

What causes rocker arm failure?

One of the major causes of component failure is faulty manufacturing. This includes all effects that increase brittleness or those inducing cracks and or stress raisers in the component. Improper heat treatment has been considered as major causes of many failures in the literature.

What is a rocker arm pressure switch?

The Rocker arm oil pressure switch is used to verify the oil pressure in the Variable Valve Timing mechanism.

How do I fix error code P2647?

What repairs can fix the P2647 code?

  1. Adding or changing the engine oil.
  2. Replacing the timing belt or chain as well as other timing components.
  3. Replacing the oil control valve or other variable valve timing components.
  4. Repairing or replacing wiring or connectors that are associated with the variable valve timing system.
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How do I fix error code P2649?

What repairs can fix the P2649 code?

  1. Replacing the ‘A’ rocker arm actuator.
  2. Repairing the wiring harness or connector to the actuator.
  3. Following the manufacture pinpoint test to isolate faults in the system.


What is VTEC oil pressure switch?

The variable valve timing oil pressure switch is a normally open switch located at the VVT solenoid. When the VTEC oil pressure switch closes, the voltage should drop to zero. This is how the PCM knows if oil pressure was applied to the VTEC system. When this system fails to operate properly the ECM may set a code.