Does the truck make any kind of clunking or popping noise while driving? Like if you accelerate and then let off the throttle is there a clunk? If so then I'd start by inspecting the U-joints. If not then it's possible there's a problem with the solenoids or varnish from lack of service before you bought the truck causing them to stick/operate slowly. I don't believe replacing the solenoids is a particularly hard or expensive job, but if you can't pinpoint the problem yourself then I'd look for a reputable trans repair shop in your area that can do some additional testing/diags to figure out the issue. Could also have your local dealer diag it but they may charge more.
Delay then clunk when shifting between P-R-D
When shifting the truck out of Park into Reverse, Reverse to Drive or Drive to Reverse I get a slight delay and then a solid clunk into gear. The engine usually has time to idle down so it's not related to high idle. It does it about %80 of the time. I just purchased this 2016 Colorado Z71 2.8l with 145k miles. I dont imagine this is normal. I just changed the transmission fluid and filter and the truck is still doing this there were no chunks on the trans pan magnet, just powder as to be expected. Followed the manual on setting level. The truck has had its regular maintenance done according to records. Im wondering if anyone has had this issue and if so what solved it. There is no warranty on the truck so I'm hoping this isn't something expensive or something that will require the dealership to fix. I'm plenty mechanically inclined to fix things but I specialize more with motorcycles.
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I should have added I also just replaced the rear most U-joint and the others are good. Currently I'm waiting for the fluid to come in for the transfer case and Diffs. It had good service records including a trans fluid change 40k ago. But being new to the truck I wanted to just start with all fresh fluids and I put Mobil 1 blue label syn ATF HP in it since that is supposed to smooth out the shifting. Is there a good way to test for any solenoids or rule out a TC on it. I prefer to do the work myself but if I have to take it to the shop I will.Does the truck make any kind of clunking or popping noise while driving? Like if you accelerate and then let off the throttle is there a clunk? If so then I'd start by inspecting the U-joints. If not then it's possible there's a problem with the solenoids or varnish from lack of service before you bought the truck causing them to stick/operate slowly. I don't believe replacing the solenoids is a particularly hard or expensive job, but if you can't pinpoint the problem yourself then I'd look for a reputable trans repair shop in your area that can do some additional testing/diags to figure out the issue. Could also have your local dealer diag it but they may charge more.
I'm not sure, but I would think with the correct scantool someone would be able to see if the solenoids are slow/delayed by seeing what the TCM commands vs what the transmission does and when it does it.I should have added I also just replaced the rear most U-joint and the others are good. Currently I'm waiting for the fluid to come in for the transfer case and Diffs. It had good service records including a trans fluid change 40k ago. But being new to the truck I wanted to just start with all fresh fluids and I put Mobil 1 blue label syn ATF HP in it since that is supposed to smooth out the shifting. Is there a good way to test for any solenoids or rule out a TC on it. I prefer to do the work myself but if I have to take it to the shop I will.
If it only happens after the first start of the day but doesn't do it again, like if you drive a ways, stop, and then shift into P and back into D or R and it doesn't do it then it could be a drainback issue and you're shifting before the transmission has had a chance to pump up. However, if it happens regardless of how long it's been since it was last started or driven then there's something more going on, IMO. The trick is finding out what that is and with modern computer-controlled transmissions it can be a bit complicated figuring out what is happening.
Keep us posted!
I have a fairly decent 2-way scan tool. I'll have to see if it has that function. The truck does it even when I let it warm up, but I haven't noticed any specific conditions related to when it does or doesn't do it. normally I'm not one to ask about this sort of thing but is there any kind of trans fluid additive that I could use to possibly help with a sticking solenoid valve? I usually try to avoid fluid additives because i know sometimes they can just make things worse.I'm not sure, but I would think with the correct scantool someone would be able to see if the solenoids are slow/delayed by seeing what the TCM commands vs what the transmission does and when it does it.
If it only happens after the first start of the day but doesn't do it again, like if you drive a ways, stop, and then shift into P and back into D or R and it doesn't do it then it could be a drainback issue and you're shifting before the transmission has had a chance to pump up. However, if it happens regardless of how long it's been since it was last started or driven then there's something more going on, IMO. The trick is finding out what that is and with modern computer-controlled transmissions it can be a bit complicated figuring out what is happening.
Keep us posted!
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