hey, im going through this same thing right now..ive owned my g coupe for 2 weeks now and on my first day the p2135 error code showed up and my g died in my driveway when i started it...i had to start it 3 times and finally i was able to drive it, but the check engine light has been on since then, and the car has died on me twice since then....i ahve also cleaned thr throttle body after day one...it was filthy...and jUst today i did the THROTTLE BODY RELEARN and im unsure if i did anything...im thinking of just unplugging the battery for a few minutes just to clean the ses light and see if it ever comes up again... anyone oppose or have any suggestion?

 

Same here my car just started doing it ..... when i drive it just turns off and it takes a few attemps to turn on before i get it to start.... it feels like the car looses power.

 

bump

 

What exactly are you bumping?

 

Just trying to revive this thread as I am expericing similar issues.

just replaced the motor on my g35 and everything is in and together but it appears my throttle is not working. The car starts and will idle but does not react to depressing the gas pedal. Thinking it was TB related I put my old (known working) TB back on and no change.
I have yet to pull codes, but will as soon as they appear.

I think something must have happened during the swap, transmission and engine were pulled together and replaced.

I am aware there are necessary relearn procedures and even with doing so they seem to have no effect to my throttle issue.

any input and or questions are always welcomed,

thank you

 

Grab the FSM and test he throttle switch (gas pedal) there's a procedure to unbolt/unplug it (about a 1min job) series together 3x 1.5v batteries (or buy a 3-cell generic holder off the internet) temp the connection to the input side of the switch, work the pedal while you use a meter to read the voltage and make sure it scales properly from 0.5-4.5vdc.

Also check the connectors and make sure a pin didn't get bent on the TB.

 

Have you gotten this problem solved?

 

Hello, purchased my 03 g35 coupe 2 weeks ago, couple days after I got a CEL and code p2138, "throttle position sensor", I have been searching on forums for answers and have not gotten far, replaced throttle position sensor and it did not want to re-learn, so threw old one back in and then from there cleaned the TB which was dirty. Cleared code and then a week later it returned randomly, I got my hands on a used TB and replaced that before spending 200+ on a brand new one and went through the re-learn procedure which went smooth, went for a test ride and when I gave some gas in 3rd limp mode arose and now I'm dumb founded. Got battery tested and its fine but not the healthiest, this morning terminals were giving me issues and had to play with them to get the battery running, I have come to the conclusion that might be something electrical along the harness or a ground possibly?, Please if any of you have a lead and can respond let me know. I have not checked fuses so going to do that.

 

P2138 is the accelerator pedal position sensor. P2135 is the throttle position sensor.

Download the FSM from here and start troubleshooting (section EC).

 

Yep, what that guy said. You can buy the APP switch separately without having to buy the entire gas pedal, just make sure to follow the calibration steps listed in the FSM section EC - Engine Controls under "basic service procedures".

 

the bumper stopp on the peddle housing little green rubber bushing a bolt that you can adjust works amazingly

 

Assuming you got A P0120-P0122 code you probably moved the throttle valve during cleaning and lost the settings that the ecu was expecting when you went to start back up.