Vibrations on 2019 Tacoma

My 19 DCTaco had vibrations at 65 to 70mph, not real bad but noticeable. Took back to dealer and told them to balance tires. All four tires came from the factory out of balance. Fixed and now smooth ride.

 

Mine has the washboard vibration starting around 28 mph to complete stop. Does it while on the brakes or letting it coast to a stop. It's not the brakes or the tires. Smooth at all speeds under acceleration. Something in the drivetrain.

 

@JacksTaco that sounds exactly what I have experienced thus far in mine. Does your brake pedal also pulse when the truck is shaking ?

My problem seems to build from the load of lightly braking ... as I lightly push it begins to bump back at me in resonance. If I apply the same pressure it builds and gets stronger. If I take away brake or apply more the shaking stops mostly.

 

I have the exact same issue with my 2018 sr5

 

No sir. Yours sounds like warped rotors.

 

So you think software fixed this?

Nope.

 

Brake judder definitely happening here from the rotors/drums . Dealer turned already I’m only at 1000 miles drive it like an ol man.

But separatly,I feel the rumbling when driving stop sign to stop sign though and it feels like the trans stumbling around . Felt this in a Ford Focus rental out of state one time . It feels like the engine is at too low of rpms almost. Also when driving the truck at about 53mph it seems like it kinda moves backwards and forwards like a chugging motion. Pop it into sport and that disappears , so I bet the same issue causes the stumble/rumble while slowing down.

 

I agree.

 

I have the same issue with my 18'. It's definitely drive train related. I'm thinking drive shaft if I were to guess. Not that the shaft is out of balance because some have had their drive shaft's replaced and no change. I think it's something to do with a two piece shaft that vibrates or has certain harmonics in that speed range. Here's what I did and maybe you can try it. I got my truck up to 45mph and then put it in neutral and slowed all the way down to zero. Vibes were still there slowing down from 28-20mph. I then got my truck up to 45mph again and put it in neutral and also killed the engine and slowed down to zero. No vibes with the engine killed. So that takes out brakes, warped axle, etc. Yes I used my brakes to slow down both times.

 

Nice idea . I didn’t think to try cutting the car off just because the push button thing is weird enough on it’s own.

 

If you feel pulsing on your brake pedal that is direct feedback from the brakes, I didn't have that at all.

 

This would also eliminate the ECU from attempting to downshift at a RPM point, or hold a gear lugging the engine. Because you put it in neutral and are making no gear changes on decel

 

I cant say if it will fix other folks problems, maybe their issue is slightly different, but I had a Toyota mechanic, another automotive mechanic, an aeronautical engineer, and a software engineer all sit in the car and feel the symptoms. The Toyota mechanic is the one that recommended the Adaptive Transmission software reset.

¯\_(ツ)_/¯

 

Yep just hold the start button in until it shuts off.

 

Yep. I thought about trying to place a camera under there while trying this. Would be nice to see if the shaft does vibrate in that range.

 

So if the adaptive learning process is errant again what’s the solution? Consistent resets at dealer?

My issues are separate as stated earlier .. I don’t think my braking issues are related to the rumble strips sensation.

 

I’m a software engineer. The rash of recent reports smell like a supply and manufacturing issue to me. It isn’t a software update or ECU reset. Maybe for you, but not the other folks in the three or four active threads.

As a software engineer, I would love for it to be software. But this shit is hardware.

 

"works on my machine"?

I hope Toyota (or someone) gets to the bottom of it soon for everyone with issues, and that they put out a 2019 TSB for it.

 

I have no solutions, just some reporting observations here.

Bought a 2019 TRD Sport DCLB about 2 months ago (Canadian Purchase).

The Timeline:
- From delivery and test drive (i bought the truck i test drove) everything was good and smooth. (Aside from the last few clunky downshifts from the transmission)
- @ ~3000-4000km I started noticing vibrations developing. Didn't think much as I hadn't patterned it to any road surface.
- @ ~4500-5000 I have driven the same route commuting (70km one way) enough to know its not road vibrations
- @ ~5000-6500 Still present and as described below.

The Vibrations:
- 36-38km/h there is a constant low audible rumble and vibrations are noticeable in the steering wheel (no viable steering wheel movement) and seat/chassis. Decelerating (braking) through this region does increase the chassis vibrations some. No feedback is noticed in the brake pedal. These symptoms are noticeable in drive, neutral and in a lower gear (forced by sport mode), 4x4 the same to more washboard feeling.
- 75-85km/h In this region vibrations are at times in the steering wheel and chassis, and vary with less intense (pulsating) droning, "wooooh, wooooh, wooooh" manner. The peak of the intensity will often vary the speed at which it occurs, however the range of intensities is always experienced when accelerating or decelerating through this range. These are symptoms are noticeable in drive, neutral and in a lower gear (forced by sport mode), 4x4 not tested. Braking does not appear to have an effect on intensity. These symptoms are noticeable in drive, neutral and in a lower gear (forced by sport mode), 4x4 not tested.
- 85-114km/h Vibrations are typically non experienced. There is typically a much less intense "wooooh, wooooh, wooooh", droning that can still be herd 50% of the time.
- 114-120km/h In this region lighter vibrations are at times in the steering wheel and, and vary with less intense (pulsating) droning, "wooooh, wooooh, wooooh" manner. The peak of the intensity will often vary the speed at which it occurs, however the range of intensities is always experienced when accelerating or decelerating through this range. These symptoms are noticeable in drive, neutral and in a lower gear (forced by sport mode), 4x4 not tested. Braking does not appear to have an effect on intensity.

Note:
- The vibration and noise was not random with respect to speed (ie. more physical vibration was felt at one speed range than another) but in these speed ranges the vibration occurs in all the places, individually and together depending on the exact speed and conditions. As the vibration was not prominent in any particular place and the frequency of the audible noise is so low, the location of the source is not apparent.

My Thoughts and Hypothesis:
The speeds and proportionally the frequency (starting in the low single digit Hz) where these vibrations are happening are all multiples of one another. The 36-38km/h range likely to be the fundamental mode. I could only guess that is I were to get up to the next tested multiple of ~160km/h I would experience the next noticeable harmonic. I can not locate the vibration but due to the conditions of not mattering what gear or drive mode that these vibrations happen the transmission is likely not the source. Braking does seem to intensify the initial vibration at 36-38km/h, there is a distinct lack of influence in the other speed ranges and there is no feedback in the brake pedal. I think rotors and drums are out as a likely culprit for these reasons. Because of the low speeds and intensity over speed that these vibrations are noticed I can also rule out wheels and tires (stock Firestone all seasons)

Now what do i think it could be. Driveshaft or U-joints would be my first guess. The seat feel and sound are reminiscent of riding around in chopped out mini trucks. However the drone in these was much more constant from the drive line misalignment. Bearings, in and out of the transfer case, axles and CV's also all seem possible to me.

 

When I told them about the TSB for the 3rd gen AT shifting the guy told me "ok we're going to check it because it could be a lot of things, just because some guy on the internet says it doesnt mean its true" another service rep walked over and told me they were going to check and see if there was something while they did my maintenance. The guy calls me a couple hours later to pick it up. When I picked it up he told me that theres was a TSB and that "we (they) dont have to do it, but we like to take care of our customers" I left happy because they did it without any real fuzz but its kinda like screw you and your "we dont have to" attitude. Do it and do it with a smile, thats how you get me to purchase there again.