2016 silverado 2500HD, 120k miles, newish transmission fluid. Had an extreme cold snap and now getting a P0700 and P0741. I realize I am probably looking at a pretty expensive repair on my 6L90, but I thinking about trying an additive just for the heck of it. Is there an additive worth considering?
I want to waste money on a transmission additive
- Thread starter CheezWhiz
- Start date
Well, P0741 indicates a torque converter issue. You could spring for some Lubegard Instant Shutter Fix. It's cheap at about $10. Maybe try charging up the battery if it's low, too.
When was the last time you serviced the transmission?
Adding a preheating device on the pan would be more effective for frigid conditions.
I've done a fluid swap within the past 20k miles or so. I confess to having never changed the filter ...
BrendanC
$100 site donor 2024
change the filter. it can plug up and starve the transmission. extremely easy on your truck.
I wouldn't consider anything but Lubegard.
I have had some funky things happen with a marginal battery. Couldn't hurt to top it off and/or get the battery tested.
I'm glad I asked. I'd change the filter and use the additive you decide on as part of the fluid top-up required to complete the job. A partially clogged filter can cause all kinds of issues. I'm a fan of Lubegard.
Did this just appear with the cold weather? Clear the codes once it gets warm, do the codes come back? Cold can have effects on wiring connectors, I would check those for corrosion and bad grounds at the transmission and TCM.
yeah first time ever, was around 0 the past few nights.
The 6L90 is know for converter issues because the wave spring is in a different location than the previous 4 speed TCs. It causes the converter clutch to wear in strange pattern and will eventually wear the clutch plates out. Keep a close eye on the fluid.
If it were me, I would call a trans shop that knows these transmissions and discuss options. They know infinitely more than I do. I'd take their recommendations which may be a TC replacement as well as a few other mods for longevity.
If it were me, I would call a trans shop that knows these transmissions and discuss options. They know infinitely more than I do. I'd take their recommendations which may be a TC replacement as well as a few other mods for longevity.
My dealer recommends BG additives (perhaps for spiffs)?! Most tranny shops recommend Lubeguard. I have the 10-speed in my ‘22 Sierra with 116K miles already. BG-ATC for 10-speeds is what I put in it. I’m sure BG has something for your tranny. The Lubeguard is also good. I change the fluid myself every 45K miles and it shifts like the day I bought it.
As for codes, the PO700 does not narrow it down, but the PO741 indicates the torque converter clutch. Either it’s bad, or a wiring issue, or a bad transmission control module.
Just completed a full transmission service including filter change and full flush using Lubeguard protectant and shutter fix on a 2018 Chevy Colorado with the 8 speed 8L45 transmission. I also followed the TSB that was published for doing this and used the recommended Mobil transmission fluid. Everything is working smoothly.
Agree. I think the terms flush, and exchange are used interchangeably even though they dont have the same meaning.
I vote for Lucas transmission fix. It is very thick at any temp which concerns me about what it will do in extreme cold. Some swear by it. I used it once and that trans died a few years later.
Bar's leaks transmission fix is one I haven't used yet, because I have no leaks.
Slick 50 recharged I have had no problems with but it is more for enhancing performance transmissions in race cars and extreme off roading
Bar's leaks transmission fix is one I haven't used yet, because I have no leaks.
Slick 50 recharged I have had no problems with but it is more for enhancing performance transmissions in race cars and extreme off roading
I think that so many people put an additive in when not needed at all....but still do it because it makes them feel better that it will help...
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Tend to agree. Not sure if there is still a flush service or not. But words matter. I recall on this forum the police told me to stop calling the thing under your hood a motor. The police were correct, but I was surprised they would take the time or even have the time to flex like that. Still, I now use engine not motor so they can move on. No biggie.
Your car uses gasoline, it’s an engine was the rationale.
So I’m not saying everyone must say “drain and fill” and stop Saying flush, but you do have a great suggestion to say exchange instead of flush. My .02. What’s the difference? It takes at least 3 drain and fills to often leave 20% old fluid behind. Flush would be one shot but may be harsher.
I just dropped the pan on a 2500. It’s very easy and there are are no exhaust compounds in the way. Take a look at the magnet in the pan. It it has a lot of debris, your torque converter may be wearing bad. Change the filter and get the transmission to a shop. If you’re lucky it’s just a torque covertor change. If there’s very little debris, you might try an additive. You need 6 quarts of Dexron VI for a pan drop.
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