Need help with APPS please!!

[Diesel Rig]

I have a 2007. I have been getting intermittent codes of P2121. It’s the accelerator pedal position sensor. On m truck it is located above and attached to the accelerator pedal. Not the bell crank style like on the older trucks. I replaced it thinking that was the problem. I also cleaned the plug at that location. After about a week, the problem returned with the same code. On one occasion, it gave me several codes all related to the APPS. One said something about low voltage.



I have no idea what else could be causing this. Every once in a while it will reset, but then it returns. When it fails, I loose throttle control for a short while. It’s not good when I am towing the 5th wheel.



Any ideas before I take it to the dealership and have to pay out the…. .



Thanks

 

[GaryOwen]

Possible that the new APPS failed. I had one fail on my 03 (bell-crank type). The replacement failed a couple of weeks later. Dodge parts have a 12 mo/12k mile warranty. They replaced the part with no charge and all was good.

 

[Diesel Rig]

Thaks



I guess it's possible, but I doubt that is the problem. Im wondering if it is computer controlled or if there is a connection on the other end that is bad.

 

[DE Jeeper]

It still sounds like a bad sensor. If all of the connections look good you may have got a defective one. Sorry I can't be more help.





Aaron

 

[rbattelle]

I think I'd be checking the connections carefully before pronouncing the new APPS bad. A corroded connection will produce these symptoms.

Ryan

 

[sag2]

Load test the wiring from the APPS to the ECM with a large bulb. I use a halogen head lamp bulb. I hardly ever ohm test anything any more. This is the set up I use. Also NEVER probe inside the terminal, always touch the edge or the outside to avoid spreading the terminal or causing more trouble than you started with.

 

[ColbyG]

You might wanna check the wiring harness itself. The one with the 5v wire in it. I had the same exact prob. on my 07 and replaced the pedal assembly. I even had Dodge warranty it thinking maybe I had just got a bad APPS. After my truck was out of commission for 3 weeks (not counting the other two I spent with the transmission dropped waiting for a new flexplate and conv. ), I decided I would check the voltage. Luckily the first thing I noticed was a big bundle of wires sitting over the dipstick tube since that had rubbed maybe a 1/4 inch of the paint off of it. I then checked the wires and there was a tiny bare spot on one of them. A little bit of electrical tape and now the problem is solved and I'm happy again. I donno if this could be the same problem that you're having but I thought it might be worth checking out...