I Just recently had a full transmission service with new transmission fluid, new filter kit. I took it on a drive the truck has done plenty of times before. After I got to my destination and started it the next morning I had some new bling on the dash. Check engine light with the tow/haul light flashing. Ran the codes and this is what I got. P2700, P0751, P0700. Im getting it towed back to the shop that did the service. Im just curious how this happened and if it was driver error or due to the recent service. Truck is a Non VGT with egr delete, oil cooler, coolant filtration and Its on blessed tunes. Ive never had an issue with the trans up till the service.

 

Do you know what fluid was used?

 

Yes, they used mercon LV

 

How many miles since your last transmission fluid change? And did they just change the fluid or did they do a full flush?

I ask because there are basically three schools of thought when it comes to (especially older) transmissions: 1. change it regularly, 2. don't change it at all, and 3. if you're going to change the fluid, do a full flush.

Where all three schools agree is that MOST transmission filters basically keep rocks and large solids from going through the transmission, but they don't do much to filter out the fine particulate matter that accumulates as a transmission gains miles. That particulate matter (clutch material, metal shavings from gears constantly in mesh, etc) tends to build up in the nooks and crannies of the transmission, and if it breaks loose can cause all kinds of issues. Those who change it regularly claim it keeps that matter from building up as much because you're removing old oil that is contaminated with it (which is true). Those who never change it claim that the introduction of new fluid can cause some of that material to break loose (which...might be true) so the old fluid will leave it in place (arguably not true). Those who insist on a flush every time claim that the flush cleans out the nooks and crannies and gets ALL of the contamination out (arguably true, though some will remain behind).

I won't tell you which method to choose - it's up to you. But I would suggest that the problems are likely being caused by particulate matter coming loose and screwing up your shift solenoid, based on those codes.

 

99powerstrokedF250

Thank you for that helpful information. I wish I could tell you the last time the transmission fluid was changed but I have only had the truck for about 8 months and I only drive it 2 days out of the week as I have a work vehicle this is just my weekend warrior. Because I was unsure of the last time it was changed I had a full fluid service done to the truck. It doesn’t look like they flushed it out unfortunately. But I understand what you’re saying with the small particles and whatnot. Thank you

 

Yeah with not knowing when it was changed, you'd have been better served if they'd done a full flush. Now that you're having issues they're likely going to have to pull shift solenoids and the valve body and bench-clean them to do things right, if not just straight-up replace them. What's worse is it'll probably be on your dime, in my experience most shops put up a fight even if it is their fault.

 

Never flush a transmission. I've seen countless trans have issues after a flush, never seen anything happen to a well running trans after just a drain and refill.

Did you check the fluid level? Did it look foamed up? I've seen shops fill a trans after they had the pan off and not recheck the level once it's been run, or not check it correctly, which left it low on fluid.

Quick Google search says the codes are:
P0700 transmission control system malfunction
P0751- shift solenoid a performance stuck off
p2700- Friction element a apply time range/performance

Could be freshly loosened crap sticking in a solenoid, maybe they disturbed the harness and something got disconnected or, giving the shop the benefit of a doubt, it's just an unfortunate coincidence that a solenoid went bad right after the service work. If it turns out to be caused by debris in there, I'd consider having the valve body pulled to be cleaned and inspected.