Over the past 4 days , my 2004 G35 Coupe has randomly lit the Service engine soon light and gone into limp mode (cant rev higher than ~1500 rpm). Prior to this everything was working normally. The codes that get stored in the Computer are p2122 p2138 p1229. It can happen 3 times in a matter of 20 minutes or go a day without any issues.

ANyone have any ideas on what I should be looking for? Anyone have this happen to them?

 

So after spending countless hours troubleshooting and tracing wires, i decided to look at all the connectors, cable harnesses, and wires for all the sensors that are associated with trouble code P1229. This includes the Accelerator Pedal Position Sensor, the EVAP Pressure Sensor, the Power Steering Pressure sensor, and the Refrigerant pressure sensor. I found that the harness with the wires that go to the Refrigeration Pressure sensor was rubbing against a piece of the body that the front bumper attaches to ( between the radiator and grille). The White/Blue wire (The one that provides 5 VDC to the sensor) was on its last couple strands of copper, also a black wire had some copper exposed. See pictures and drawings below

 

Appreciate you sharing this with us.

 

Thank you for posting the information and finding. Hopefully it will help out another member someday.

 

so I fixed this issue with the wires and it keeps throwing the codes so I tried a new throttle body and it worked for a day and the next morning it pulled the same thing. Does anyone have any idea?

 

P2122, P2138 is the APP, not the TB.

P1229 could also be the APP as well.

EDIT: APP = gas pedal, accelerator pedal position switch. Your gas pedal is just an electric switch.

 

I fixed the pedal as well and it worked for a day and next morning it didn’t work again