I posted this on g35driver but I wanted to post it over here as well hoping to double my chances on fixing this problem so I can get it back on the road again. Also it seems like I find more answers over here when I search for problems.

I have an 05 g35 6mt coupe and it's throwing codes for the pedal position sensor and the vdc and slip lights are on. The codes are P2123 & P2138 which are Accelerator pedal position sensor 1 & 2. When the car is in nuetral and I floor it, the rpms slowly rise to 3k. It won't go any further than that. On a couple of occasions I drove it around and sometimes in certain gears I could get it to redline and drive normally but when I would change gears or let off the throttle and get back on the gas, it wouldn't rise over whatever rpm it had lowered to. I have changed both the throttle body and the gas pedal w/ sensor from 2 different working cars so I know it's not those 2 things. Could there be a blown fuse somewhere or a disconnected plug somewhere. I just need help on where to start looking next.

 

 

The APS sensor is known to fail - first thing is to check all the wiring around the sensor, sometimes it gets strained or bent. Then you should check to see if it needs replacing, you may need to use the dealership for that. This would cause throttle problems and the SLIP light to come on.

 

Did you do the relearn procedures on the new throttle body?

https://my350z.com/forum/6008226-post2.html

 

^ yes, but it didn't help.