i have a 2005 g35 coupe auto with a vortech supercharger has been running great but goes into limp mode pulled codes p1122 and 1126 i have changed the throttle body and mass air sensor car will run for 10-15 mins and then go back into limp mode can anyone help me dont know what else to do

 

What EMS? I get those with my UTEC, I'm convinced after mass troubleshooting/replacing of parts it's caused by the UTEC itself.

Other than that, check all grounds on the engine.

 

unplug the negative battery cable and wait for like 5 min put it back and drive around it should go away. My friend had the same problem but with out a s/c.

 

my car has been down for over 2 months now cant figure out whats making it go into limp mode we changed throttle body mass airflow sensor and ecu we checked engine harness still cant figure it out can anyone help need this problem fixed

 

Ok I got a theory before buying all these car parts because your car is on limp mode check to see why by resetting any codes first then get ur car reprogrammed and then to be on the safe side reprogram your car keys drive the car for a few miles see if it drives better and if the check engine light pops back up check to see what codes it gives u now. Also check to see if your anti theft alarm is on even after unlocking your vehicle if it is that's what's causing your limp mode ur alarm is engaged.

 

This thread is 13 years old. You can't even start the car if it's a NATS anti-theft issue, it will NOT cause a limp mode.