Engine/Transmission (1998.5 - 2002) no throttle

[VolsFan]

As I was driving home this evening, my truck power to the accelerator pedal, it just went to an idle, rpms went down to 800, sounded normal, but I had no throttle whatsoever. Fortunately nobody was around, I drifted to the shoulder and then the throttle kicked back in. This whole ordeal was only about 30 seconds long. Naturally the check engine light was on, so when I got home, I pulled up a code P0121- TPS voltage does not agree with MAP. Does anybody know what this is? Im hoping it is something minor... .

 

[CSnyder]

Your gonna need to replace the APPS. You can try resetting it but usually only works for short amounts of time before it goes bad again.

 

[tntframing]

Mine did the same thing as yours last weekend. after doing the checks by the book the apps was no good. she was about $530 from the dealer. its very easy to change out. Just be careful not to break the cruise control cable plastic retainer clip. as i did. had to replace the whole cabl. another $40. hope this helps

 

[mhenon]

Check eBay. You might find one for a lot less than $500 bucks. You can also order a new APPS from Hoesli Diesel for around $370. 00.

Mike

 

[VolsFan]

i was afraid it might be that, thanks for the information. I will check ebay before i go to the dealer for it. I reset it lastnight thinking that was the problem myself, I let the batteries sit unplugged all night and hooked them back up this morning and pumped the throttle 3x, I'm assuming it should be alright for a little while, it ran fine today. I'm hoping it will hang in there for a few months actually, atleast til may, when i'm done with college; tuition sucks. But then again I dont want it to leave me stranded. Anyways, thanks for the help

-Rick

 

[mhenon]

From what I hear it rarely gives up altogether. Mine got to the point where I had to shut down the engine and restart. It would go for hours/days before screwing up again. Just got to be real annoying. Good luck!

Mike

 

[ScottLauer]

For what it's worth changing out the apps is a very easy process. 2 phillips head screws and about 6 10mm headed bolts and its off.

I do have one question concerning the removal of the cable off of the old apps. Is there a better way to do that than just prying it off? Is the retainer supposed to come apart somehow? I ended up breaking a peice of it off because I though it was supposed to seperate somehow and I couldn't quite figure it out.