2011 m56s 3500rpm or higher. Vehicle speed limit warning light turns on p0021. Scan fault code Engine out Engine check light off when restarting Limp mode continues. I want to know the cause of the failure. Please help!

More than likely it is the VVT solenoid. I am not sure how many solenoids have, but there are likely four and P0021 is for the intake solenoid on the passenger side. There are other reasons for P0021, but in my experience, the solenoid is the problem.

Anyone had to do gallery gaskets? P0021/P0524

Successfully Replaced HPFP, have different problems now

P0021 INFINITI Code - Intake Valve Timing Control Performance Bank 2

There are a few possibilities for the code which includes dirt and debris in the oil, a bad sensor or a bad solenoid valve, or even timing chain in extreme cases.
Since you have the fail-safe at 3,500 rpm, then it points at the VVEL solenoid as the most likely culprit.

However, if you would like to make sure what the issue is before replacing, here is a test that you can do for free. Since you have a code reader, it will make troubleshooting much easier.
Take out that bank 2 intake camshaft sensor and exchange it with a different location. Scan the car again to see if the code changes:
1. If the code changes, then the sensor is bad
2. If the code stays the same, then the problem is related to the solenoid.


Worst case scenario? A broken solenoid that you need to replace anyway - my-m56x-won-t-rev-past-3500-rpm-no-ses- ... 20590.html