I have a 2001 6 speed manual 2500 with a dead pedal/runaway throttle, it changes randomly and sometimes will almost redline without me touching the pedal. It will drive normal for a few minutes then start doing this every time.

At first I thought it was the TPS but I have put 2 different ones in and it still happens. I checked voltages on the TPS and it would range from .5 at idle to 3.8 at full throttle (normal limits from what I have gathered). The ground to the TPS is also good.

My truck has also thrown 11 codes:

P0606 PCM fault

P0238 MAP voltage too high

P0123 TPS voltage too high

P0122 TPS voltage too low

P0118 Engine coolant temp sensor high

P0113 High voltage from intake air pressure

P0602 control module programming error/not programmed

P0380 glow plug/heater malfunction

P0382 same as 380

P0222 Voltage produced from TPS too low

P0121 TPS switch "A" circuit problem



The truck runs fine other than this issue except it was cold blooded so P0380 and P0382 make sense.

I spoke to a diesel shop and they said that they had a customer with the same exact truck with dead pedal/runaway issue and it ended up being the ECM.



My questions are,



1. Has anyone with a gen 2 had this issue before that can shine some light on the situation?



2. If it is a computer I am unsure of which one failed (ECM or PCM), I was thinking PCM due to code P0606 but after speaking to that diesel shop it sounded like ECM. Does anyone have any insight into this?



3. How exactly do I check the ECM and PCM with a multimeter? I have had trouble finding good videos or instruction that show me how to this so if anyone knows of any or has some of their own that would be a huge help.



4. If I do have to replace ECM or PCM does anyone have any recommendations for a reasonably priced yet reliable source?



Thanks

 

Could be as simple as grounding issue or as difficult as you describe. The main thing is the codes are all electronic issues, so to me it reckons of a bad ecm, especially if the APPS didn't fix it.....

Any tuners or past fiddling that may affect the 12v supply? I'd start simple and free like cleaning and reconnecting all grounds, getting alternator and batteries tested etc., before you start throwing parts at it.....

Maybe AlpineRam will help you out.

 

I had the same codes, same issues. It was the ECM. Rebuilt ECM fixed all problems.