Sorry for resurrecting an old thread but I have the same issue. I have the latest OS which shows the D1 options unfortunately after adding them it still tried to shift into 2nd. Further logging I noticed that even when I put the trans into 1st it doesn't register D1 in the PRNDL or current gear in HP tuner. I can put the car in 2nd and it stays in second, and it drives normally in 4th. The trans shifts and drives like normal and I see the 'current gear' show up correct as the car shifts through gears.
Am I correct in assuming that for the ECM to register a D1 (1st gear) a PRNDL switch must be connected and wired up to the ECM somewhere? Or should it be reading this from the transmission internally?
Thanks to anyone who clear this up for me, I've tried researching it but can't get a clear answer on where to go next.
I spent the better part of the weekend getting a PRNDL switch installed and it's reading correctly (D1, D2 etc) in the log files under PRNDL status. Unfortunately setting the D1 table speed to 255 didn't stop it from shifting to 2nd.
Chris, I sent you an email with my log file and the config. Please let me know if there's anything you can do to help as this has been a nightmare for us.
Thanks!
Still fighting this issue. I would love to be able to get this resolved so I can hit test and tune tomorrow night while weather is nice.
First the PRNDL switch does not have to be there. When set to "none" on a gen III pcm it determines that data internally from the transmission and works fine without it. Second, its not the "D1" table you need to change, its the "D1 Urban" table that unfortunately still has not been added to most of the OS's.
Thank you Bluecat for clarifying that for me...unfortunatley I won't get back the time I spent swapping the shafts and modifying a bracket to work and wiring it all in, but lessoned learned. I was speaking with Bill and he has requested one of the files showing the "D1 Urban" table for comparison to see if someone can work on getting something going for my OS so I'm currently looking for someone with a file with the OS where D1 Urban is present and will likely create a new thread for this request. Unfortunately I'm somewhat stuck without the change and really looking to get back to racing. Again, thank you for clarifying Buecat.
One more reason to buy hpt instead
We add the table on a case by case basis(we've already added it to many operating systems), we already have enough work on our plates to keep us busy for the next two or so years with dodge/ford/gm definitions, if you need it added to an operating system simply email support the file and one of the files that already has the table and we'll do the rest.I am running HPT build 2.24.241 and this parameter (D1 Urban) is still not available for 2004 OS 12587603 - hopefully it is soon.
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"
If that is the case Bill, last I checked it still wasn't there for 12587603. So let me re-request that if that is what needs to happen. I don't normal care to just manually go out and change the data myself, but on vehicles that have HPT custom os's already applied I can't do that easily. I have to find a stock os file, manually mod that data, flash, reread in HPT, appy custom os, and reapply all the previous tune... ect. Alot of work and time for just wanting to change about 20 bytes of data. lol. I had to do that about a month ago for 603, which I use almost exclusively for blue/green stuff since it was an OS like 156 that was used in almost every vehicle platform. Hell while your at it do 604 and that way I've have a supported D1 urban os for every early style pcm/platform.
69 Suburban Bagged & Blown: http://67-72chevytrucks.com/vboard/s...d.php?t=200387
68 Farm Truck build thread-LS3/6L80/TVS1900: http://67-72chevytrucks.com/vboard/s...d.php?t=358692
Back from the dead... I don't see this available for 12587604. I'm tired of the transmission shifting out of 1st
Can you add this to 7604, please?
Any update on this? I sent Chris a PM regarding this as well.
Any update?
Any update?
I would also like to add d1 d1 urban etc???
Bringing the dead thread back... I must say I'm a noob tuner, basically had my car base tuned and am doing small adjustments myself but this 1st gear crap is killing me from a low roll. What do I need to do?
I'm experiencing this problem as well. Is there any way to fix OS 12208322? Donor vehicle was a 2001 Silverado 2500HD. Thanks!
Easiest thing to do is just swap to one of the more populated OS's. In your case the 12212156 from 2002.
James Short - [email protected]
Located in Central Kentucky
ShorTuning
2020 Camaro 2SS | BTR 230 | GPI CNC Heads | MSD Intake | Rotofab | 2" LT's | Flex Fuel | 638rwhp / 540rwtq
2002 Camaro | LSX 427 | CID LS7's | Twin GT5088's | Haltech Nexus R5 | RPM TH400
James, I have a stock tune file in one of my folders with the 12212156 OS. When both are opened with the compare feature, there are visually no differences. Any advice?
James Short - [email protected]
Located in Central Kentucky
ShorTuning
2020 Camaro 2SS | BTR 230 | GPI CNC Heads | MSD Intake | Rotofab | 2" LT's | Flex Fuel | 638rwhp / 540rwtq
2002 Camaro | LSX 427 | CID LS7's | Twin GT5088's | Haltech Nexus R5 | RPM TH400