46re taking off in third sometimes
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Professional
Joined: Dec 2021
Posts: 221
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From: Florida
I've been out of the game too long to have a good recommendation. There is a LOT out there on the market, some better than others...... Generally, the better they are, the more expensive they are..... typical eh? 
But, to get one that does all the cool tricks, you are looking at thousands of dollars.... but, it will work on most OBDII vehicles..... If you are only playin' with one, and have a laptop, then tuning software from folks like HP Tuners works REALLY well, and lets you shuffle stuff around within the tune. I don't know if it also does ABS or SRS.....
But, to get one that does all the cool tricks, you are looking at thousands of dollars.... but, it will work on most OBDII vehicles..... If you are only playin' with one, and have a laptop, then tuning software from folks like HP Tuners works REALLY well, and lets you shuffle stuff around within the tune. I don't know if it also does ABS or SRS.....
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Professional
Joined: Dec 2021
Posts: 221
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From: Florida
I got a live data scanner and it worked fairly well. It pointed me towards a bad PCM.
i plugged it in and it went to decode the vin. It failed to do that but I wasn’t super concerned about it so I continued. I went to have it scan each vehicle function controller (PCM TCM ABS SRS) and it said
“not installed” for all of them. It bothered me a bit but the appearance of them wasn’t necessary for reading live data. So I went to live data and could only get basic functions that would appear on the gauge cluster. (Rpm wheel speed oil pressure) strangely it did show O2 and TPS, it also had fuel trim and timing advance but there were no values for either.
i went for a drive to see if what was available would show me anything. The truck drive great until it wouldn’t go into first at all. Not manually not automatically. When this happened I lost OBD scanning and the scanner kept reporting not connected and the truck wouldn’t automatically go below 3rd gear.
All of this just to say it seems like a PCM problem but feel free to give your input.
i plugged it in and it went to decode the vin. It failed to do that but I wasn’t super concerned about it so I continued. I went to have it scan each vehicle function controller (PCM TCM ABS SRS) and it said
“not installed” for all of them. It bothered me a bit but the appearance of them wasn’t necessary for reading live data. So I went to live data and could only get basic functions that would appear on the gauge cluster. (Rpm wheel speed oil pressure) strangely it did show O2 and TPS, it also had fuel trim and timing advance but there were no values for either.
i went for a drive to see if what was available would show me anything. The truck drive great until it wouldn’t go into first at all. Not manually not automatically. When this happened I lost OBD scanning and the scanner kept reporting not connected and the truck wouldn’t automatically go below 3rd gear.
All of this just to say it seems like a PCM problem but feel free to give your input.
Administrator
Joined: Apr 2010
Posts: 87,366
Likes: 4,209
From: Clayton MI
That is odd..... If you can, just get a junkyard PCM, and see if symptoms improve. SRS and ABS lights may stay on due to VIN mismatch... but, if it's a good PCM, it *should* run the engine/trans just fine.
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Professional
Joined: Dec 2021
Posts: 221
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From: Florida
when I get a chance I’ll head to a junk yard and pick one up. I need specifically a 5.2 pcm correct? A 2500 5.9 won’t work?
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Joined: Apr 2010
Posts: 87,366
Likes: 4,209
From: Clayton MI
On a sticker on the PCM itself. May mumble something about "authorized software update", or some such. A PCM for a 5.9 would probably 'work', for certain values thereof..... but, would run the engine rather rich in open loop.