P2647 GMC code

What the P2647 code means. This trouble code indicates that the powertrain control module has detected a malfunction in the intake camshaft rocker arm actuator system (A). This code is usually found in vehicles that have variable valve timing.

Where is the rocker arm actuator located?

Zitat von Youtube: Number three electrical issues since the rocker arm actuator is located at the top end of the engine. It is exposed to high engine temperature inspect the connection at the rocker. Arm.

What is a rocker arm actuator stuck on bank 1?

What causes the P2646 code? The ECM detects a problem in the rocker arm system for bank 1. The oil passages are clogged or the oil pressure is not up to specifications. The rocker arm actuator is clogged with sludge or is sticking intermittently.

What does a 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 error code P2646?

What does OBD-II fault code P2646 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.

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.

How much does it cost to fix a 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 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).

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 you replace rocker arms?

Remove the bolts from the valve cover using a socket and ratchet. Lift the valve cover away from the cylinder head. Remove the nuts from the affected rocker arms using a socket and ratchet. Remove the ball and rocker arms from the cylinder head.

How do I bypass the VTEC oil pressure switch?

This can be easily bypassed with a simple wiring trick: On your engine harness, locate the VTEC oil pressure switch plug/wire (this wire comes from OBD1 ECU pin D6). Use a common T-tap or other method and simply tap this into the VTEC solenoid valve wire (the VTEC solenoid wire comes from OBD1 ECU pin A4).