No throttle response at times.

[SMOKIN01CUMMINS]

My 2004. 5 will surge with the cruise on. Got back home and went to work in the a. m. and the pick-up went full throttle and then backed off to no response and kicked on the engine light. cycled the key three time and got all the p codes. p0602,p02121, and p02122. Everything leads to ecm or apps, so I took my programer out and the light went out. Now I get dead spots in it but no light. How do I know if its the ecm that needs calibrated or flashed or if its the apps?

Thanks Ryan.

 

[p-Bar]

Try disconnecting the batts. and let it sit 1/2 hour or so .

 

[befrazier]

You might also try unplugging the apps and cleaning the plug. Apply dielectric grease and plug it in. This is what fixed mine.

 

[befrazier]

I talked to timmbo apps guy and he made me a new pigtail plug that plugs into the apps sensor under the battery box. I had a guy take the old plug off and install the new plug. He noticed on the old plug that there were two pins loose inside of it. The truck runs great now. Any of the trucks that have the apps under the battery and is having the reoccurring codes may need to check this out. I have had this issue for several years and have bought two sensors with the same problem coming back. I had the guy check out the older apps sensors and they both worked fine. Hopefully this long process, trial and error, determination and the help from TDR and timmbo apps my problems are gone.

 

[befrazier]

The APPS problem came back a couple of months after the pigtail replacement. Although I needed to replace the pigtail anyhow. I unplugged the two big electric plugs attached to the firewall on the drivers side, cleaned with electronic cleaner and put dielectric grease on every small pin hole and plugged back in. I was reluctant to post for quite some time after I did this because of the past failures. I have not had any problems for approximately 9 to 10 months now. Hope this may help someone.