6l90e won't shift
Thread Starter
Teching In
Joined: Sep 2016
Posts: 23
Likes: 1
6l90e won't shift I'm looking for a little info, I've just finished up a 2015 L20 6l90e out of a van swapped in a 88 chevy truck. It starts runs and drives but it will not shift out of first, I'm using the matching engine, e38 pcm, and transmission out of the same van. Any info will be greatly appreciated !
Thanks !
Thanks !
Checked fuses for trans? Canbus wires hooked to trans? Fluid good? Trans connectors plugged in good?
The main trans plug is wierd to plug in. Has to twist and lock in place. Had an issue with a swap i did with tht plug. Hptuners couldnt connect to the ecm or tcm bc it was unplugged.
The main trans plug is wierd to plug in. Has to twist and lock in place. Had an issue with a swap i did with tht plug. Hptuners couldnt connect to the ecm or tcm bc it was unplugged.
Thread Starter
Teching In
Joined: Sep 2016
Posts: 23
Likes: 1
Checked fuses for trans? Canbus wires hooked to trans? Fluid good? Trans connectors plugged in good?
The main trans plug is wierd to plug in. Has to twist and lock in place. Had an issue with a swap i did with tht plug. Hptuners couldnt connect to the ecm or tcm bc it was unplugged.
The main trans plug is wierd to plug in. Has to twist and lock in place. Had an issue with a swap i did with tht plug. Hptuners couldnt connect to the ecm or tcm bc it was unplugged.
Thread Starter
Teching In
Joined: Sep 2016
Posts: 23
Likes: 1
My scanner is showing engine tach signal, trans rpm, speed, gear command. It goes into rev, neutral, and forward but never shifts out of 1st. That' why I'm at a bit of a loss.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo You said you are running a e38 ecu. Far as i know in 2014 and up they use a e92 controller. It is huge computer. We convert the new engines to use the 2013 and older harnesses that use the e38. We also have to reflash the tcm to match.
Thread Starter
Teching In
Joined: Sep 2016
Posts: 23
Likes: 1
Yea it's matching L20, 6l90e, with a E38 pcm out of a 15' express van
Thread Starter
Teching In
Joined: Sep 2016
Posts: 23
Likes: 1
Checked fuses for trans? Canbus wires hooked to trans? Fluid good? Trans connectors plugged in good?
The main trans plug is wierd to plug in. Has to twist and lock in place. Had an issue with a swap i did with tht plug. Hptuners couldnt connect to the ecm or tcm bc it was unplugged.
The main trans plug is wierd to plug in. Has to twist and lock in place. Had an issue with a swap i did with tht plug. Hptuners couldnt connect to the ecm or tcm bc it was unplugged.
Thats most likely the issue. Says ign voltage to low. Try bypassing the key switch and hook your main ign wire for the ign relay to a toggle switch or something. See how it does thin
I always delete it. Do you have the torque converter bolts in??? I think it is something major and simple like that Thread Starter
Teching In
Joined: Sep 2016
Posts: 23
Likes: 1
Yea on the scanner it shows each gear selected ( park, reverse, neutral, drive, and low) just as it should. It also will show the gears being commanded up to 4th before it hits rev limiter. It shows eng rpm, trans rpm, trans temp, and vehicle speed. That's why I'm baffled. This trans had Less than 500 miles before the van was totalled but now I'm wondering if there is something wrong with it internally.
TECH Apprentice
Joined: Jul 2016
Posts: 349
Likes: 19
Strangely, on older GM full size trucks not powering up the second ignition wire (White wire in the main ignition harness) causes a similar issue. Vehicle won't shift out of first. And can cause transmission damage in short order. When I first started installing Remote starters in the early 90's, a few guys I worked with learned this the hard way. IIRC, this wire feeds the transmission.
Bent pin in the trans harness maybe? Good luck!
Jay
Bent pin in the trans harness maybe? Good luck!
Jay
