Anyone here had any problems with this sensor? As of late, the throttle felt like it was very, very slightly dropping out. Yesterday, I was cruising at 35MPH and if felt like the engine died, but it was at idle and wouldn't respond. Check engine light came on and I read the code when I got home and pretty sure it was P2121 on my Superchips Tuner. The fault is gone, so I can't be sure, but it did say APPS fault. I did disconnect the battery earlier today.

Thanks, Tiny
2004 5.9L Cummins

 

Never had the problem myself but have you replaced the part? I know the impalas had a lot of issues with the APPS.

 

Dealership wanted $679 for the whole bell crank assembly with the sensor, 4 week back order. Found many on ebay from $29.95 to over $300, went for one for $89, should be here today. I will update.

 

The first one didn't work, this one did.
http://www.ebay.com/itm/151725597200?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

 

Ya, 2004 and 2004.5 use different types...