HELP!!! So I come out the house start my car and it cranks, starts, then dies. I start it back up I get a CEL. I get out my scanner and check the code. I get P0021 Camshaft A. I clear it and it drove fine. Then I get out and go to the store. Come back and I'm driving and it goes into limp mode but without a CEL. I pull over and rescan it. Had a pending code for P0300 Multiple misfire. I clear it but still in limp mode. I get somewhere and pop the hood. Check the intakes and oil. I restart the car and is no longer in limp mode but has a pending code for P0300. Not sure what to do. I've only owned the car for about 15k miles. Currently at 117k.

 

How are your spark plugs? Or when was the last time those were replaced?

 

I never replaced them

 

VQ37VHR? VQ35HR? Model year?

 

It's a 09 G37x

 

I had that code come up because i accidentally reversed the wires for number 5 and 3 coil
Possible issues
- Faulty spark plug (s)
- Faulty ignition coil (s)
- Clogged or faulty fuel injector (s)
- Intake air leak
- Fuel injectors harness is open or shorted
- Fuel Injectors circuit poor electrical connection
- Ignition coils harness is open or shorted
- Ignition coils circuit poor electrical connection
- Insufficient cylinders compression
- Incorrect fuel pressure

 

Well imma change the spark plugs in the morning. Hopefully it'll help

 

UPDATE!!! So I checked the spark plugs and they look new. I cleaned the mafs and tbs. Cranked the car up. Motor it out and ran it hard even took it to redline a few times. Then as I'm around the corner from home it starts jerking over 3k again. Pull a pending code p0300 again. I'm unsure what else to check.

 

did you ever fix this issue because i have the same model car as you and i just experienced a limp mode after a new hf cats and ctb exhaust. They also went and tuned it and found that it was knocking with max numbers.

 

Yea I changed the intake valve timing solenoid and its been working fine ever since. *knocks on wood*

 

check coils