Bloom99cummins

I went to smog my truck in CA and when the tech plugged in to the OBD2 his computer could not communicate with my truck. He asked if i had a tuner or something on the truck. After 3 shops all unable to read the OBD2 i am left scratching my head. Would flashing ECM or PCM help? Need to pass ASAP! The truck has never been tuned. but did have the ECM reflashed in 2019 by Auto computer specialists truck runs great. no codes. Any help would be great.

Sorry for the long delay. Work and life has been crazy!! so I started small and cleaned all the terminals. Checked the a/c noise. Ended up replacing the alternator. I checked the tv cable and it appeared to be good. I wasn’t 100% on how to adjust it on the 99.... but it sure is shifting better now. It does seem when in OD and the tc locks up the rpms can drop to 1200 or so the only thing left to do is the w-t mod and to my recent surprise a new oil pan gasket. if any one has done the oil pan gasket and has any tips they would be much appreciated

Thanks for all the posts. I’m plannin on doing the WT Mod soon. I’m at work til Thursday but I’ll start trouble shooting when I get off work. Any more info on the tv cable? Where to start when checking? Thanks again

I have a 99 2500 with automatic Transmission that was just rebuilt and a new two disc tc. The first time I drove it after the rebuilt the transmission shifts quickly from 2nd to 3rd to 4th(O/D). It doesn’t happen when your foot is really in it but when you accelerate normally it jumps up and the engine bogs down. The transmission guy that worked on the truck told me it was an electrical issue on the APPS sensor but I want to get some other suggestions before throwing money at the wrong problem. Also the APPS sensor is a few months old