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Discussion Starter #1
I am getting this code:

P2646 A Rocker Arm Actuator System Performance or Stuck Off

What exactly does this mean?

Issues w/ 2nd cam?
 

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P2646 A Rocker Arm Actuator System Performance or Stuck Off
P2647 A Rocker Arm Actuator System Stuck On
P2648 A Rocker Arm Actuator Control Circuit Low
P2649 A Rocker Arm Actuator Control Circuit High

Description
Intake and exhaust camshaft lift can be changed by means of the Variable Valve Lift (VVL) system, which varies
the amount of maximum lift of the intake and exhaust valves. The mechanism uses dual element rocker arms to
provide cam changeover, with both the intake and exhaust camshafts having high and low speed cam profiles.
The system is ECU controlled, using an oil control solenoid which, when activated, uses hydraulic pressure to
push a rocker arm locking pin into engagement to activate the high-speed cam profile. A signal from the VVL
oil pressure switch provides feedback to the ECU that VVL activation has taken place. VVL activation* to the
high lift camshaft profile occurs at 6200rpm when engine speed is increasing, and returns to the low lift camshaft
profile at 6000rpm when the engine speed is decreasing.
*Coolant temperature must be >60°C (140°F).
Component connections
Connector Description ECU Pin ECU Connector
1 Battery Voltage - -
2 VVL Oil Control Valve 12 52 Way
- VVL Oil Pressure Switch 21 52 Way
Monitor: Continuous
Enable Criteria: Engine running
Disable Criteria: None
Potential failure modes:
• VVL valve stuck open / closed
• VVL valve open circuit
• VVL valve short to ground
• Rocker arm failure
• Rocker shaft location pin failure
• ECU output circuit failure
Notes:
The MIL will be illuminated if the fault is present for 2 consecutive trips.


Probably a fail or stuck, or the rocker problem thats talked about on here.
 

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Got a MIL...P2647 : Rocker Arm Actuator A Bank 1 Stuck On...
My car is an 06 supercharged Elise with 17000 KM (11000 miles)
Didn't over rev, but sometimes, i shift with the rev limiter..Didn't open the valve cover yet...wife still saying" I told you..." :huh: I'm waiting for my birthday in a few days, new rocker arms would be such a good gift...;)
Beware if your car is suddenly running extremely rich with bad idle...


Any advices...

Thanks, ;)

Jean
 

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I had this code on my engine and the engine would not go onto the "2nd cam", but instead it ran at 6,200 rpm as if it had hit the rev limiter. It turned out the electrical connector to the actuator on the left side of the cylinder head had come loose. I plugged it back on, cleared the code, and everything went back to normal. Hopefully your problem turns out to be this easy to fix.
 

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P2646 - I've gotten this code twice while autocrossing and hitting the rev limiter. Is this potentially serious. Could hitting the rev limiter trigger it?
 
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