Secondary air injection switching valve failure stuck in open position causing limp mode in the truck. Truck is not able to get to speed above 40 mph. This happened as I was pulling out of my neighborhood onto a state route with speed limit of 55 mph and cars going way faster than that. This could pose a danger if situations where speed it required to get out of the way of another car. Truck only has 57K miles on it. This is a supplemental emissions system and should not cause the truck to be useless if fail.

- Kansas City, MO, USA

My 2012 Tacoma with 45,000 miles got a check engine light and "trac off" light when I started it to go home. I was merging onto the interstate and unable to go above 40 mph. This was obviously not safe so I exited and took it to a dealer. They cited trouble codes P2440 and P2442 and said they needed to replace secondary air injection valve (pn 25710-31022) for a total cost of $940! according to forums and the NHTSA.gov site, this is a very common complaint with this year and model. I just bought this last July and I never expected to have to replace parts anytime soon.

- Shueyville, IA, USA

As I've read from numerous other 2012 Tacoma owners on tacomaworld.com, my secondary air injection switching valve has failed at 65K miles. This seems to be a recurring issue with all 2012 similar Tacoma models and should absolutely be recalled and replaced for free! until fixed, my truck is undrivable, meaning the cel light is on and the truck won't go faster than 30 mph.

- Simi Valley, CA, USA

This doesn't happen all the time but occasionally when the truck comes to a stop and the brake pressed the vehicle will accelerate with a surge and feel like someone has bumped you from behind but there will be no one behind you. I have taken the vehicle to the dealer and they made some adjustments but I continue to experience the problem. This has happened since I bought the truck. I purchased the truck with 1200 miles.

- Olathe, KS, USA

At aproximate 40 mph and at a constant speed the vehicle starts to shutter or shake, feels like it wants to down shift or up shift maybe its confused. Dealer could not duplicate 2 times

- Jenkinsburg, GA, USA

Vehicle lunges when you come to complete stop, better hold the brake with some force any time stopped, Toyota service says it happens all the time, its normal !!

- Jenkinsburg, GA, USA

My 2012 Tacoma is not shifting properly. It is shifting very hard and a bit erratic when driving, and when I am completely stopped at a light, the truck will sometimes violently surge forward making it feel like another vehicle has hit me from behind. It does not happen all the time, but it seems to happen more when it is cold. I took it to the dealership only to be told they could not replicate it, and this is normal for a Toyota. The dealership also said that Toyota is aware of this, all Toyota do it (even the brand new ones), and nothing can be done. My truck is still covered by the Toyota 5 year warranty and the limited lifetime warranty offered from the dealer when I purchased it. I feel like they are not honoring their warranty. If this is true and Toyota is not correcting these issues, guess I won't be buying that 2015 4-runner I really want!

- Jacksonville, FL, USA

I was approaching a stoplight at a downward angle and while applying the brake the vehicle began to shake violently. I was going approx. 15pmh when it started and it didn't stop shaking until I got down to about 5 miles per hour. I took it to the dealership that day and explained the problem to them. They got the vehicle to reproduce the vibrations and I have paperwork stating this. It has been a full year later and they haven't repaired it yet. They continually tell me parts are being designed. Just wait. That's all they keep saying. I found out that they made a fix for the V6 model within 7 months, but they didn't have enough complaints against the 4 cylinder model to warrant redesigning parts. I was told this by the service tech at the dealership.

- Fort Smith, AR, USA

Loud whinning noise from under vehicle at speeds between 30mph and higher.

- Medford, NY, USA

There is a vibration in the entire drive terrain when accelerating from a stop. The vibration only occurs from a stop and between 5-20 mph. This was first noticed in March of 2013 and the dealer (middle town Toyota) and us corporate Toyota were made aware, but was told nothing can be done. As of today, the vibration appears to be getting worse. There has not been any loss of control yet of mechanical failures, but with the vibration getting worse, it is only a matter of time before failures start occurring.

- Terryville, CT, USA

3-5-2013 Tacoma 2012 trd 4X4 automatic new, I noticed a vibration on acceleration in 1st gear through 2nd gear in the first few days of purchase. However, because of my job travel and just being lazy I never discussed this issue until recently. The 1st time I brought it to my dealer was 31 Jan 2013 13,433 mi. The dealer acknowledged the vibration and said Toyota will attempt to fix this problem with a three tier fix. 1. they ordered engine mounts per tsb. 2. Feb 2013 I brought the vehicle back they installed the mounts, did not fix the problem. As part of this tier fix, while in for repair they also replaced rear spring assy. Right & left and the final step 3. replacing steering wheel damper sha per tsb. The dealer said all this did not help. 28 Feb 2013 14,325 mi, I returned after putting more miles on this troubled vehicle. This time they removed the drive shaft and drove the vehicle in 4WD and vibration gone. They installed a drive shaft from a new Tacoma 2013 and the vibration returned. They said they created a tas case #. the ( product engineer) "? said this vibration is normal and cannot be fixed at this time and is under review. I must say that my dealership has been very accommodating kudos-kudos. I feel that any vibration in the drive train of any vehicle cannot be considered normal. This problem has been with Toyota for a while so it seems and I ask why, why, why. Toyota knows the above fixes do not fix the problem in any way. So why are they still doing it ?"

- Colorado Springs, CO, USA

Tacoma 2012 trd 4X4 6spd since new @ 3 miles, truck shakes upon acceleration in 1st through 2nd gear from 3 to about 25mph (mostly uphill) and transmission grinds and won't engage all gears always. Suspect drive train will fail. 1. at 90 miles brought to dealer. Dealer found driveshaft center support bearing installed incorrectly (not aligned, crooked) and drive shaft contained no grease. Toyota usa acknowledged problem, Toyota usa instructed dealer how to attempt to remedy problem. Dealer inspected, removed & road tested with vehicle in 4X4 (without rear drive shaft installed) and vibration / shudder gone 100%. dealer reinstalled and problem returned. Toyota advised dealer to tell me (buyer) to go away until 5000 miles and live with the problem. Other complaint was transmission grinding and often reluctant to go into 1st gear. 2. at 500 miles, I returned to dealer with problem still present and I refuse to live with it. Dealer told me Toyota usa instructed dealer to not document my visit and not inspect my truck. 3. at 4914 miles, I brought truck brought to larger dealer, for 1st service + same complaints: Shaking still present, transmission grinding and reluctant to engage gears as well as popped out of 1st gear (worsening?). Toyota usa changed opinion saying " it's normal ". 4. at 5554 miles, brought vehicle back to same larger dealer with same complaints. Dealer wrote repair order with same problem. Toyota usa contacted by dealer due to history, Toyota usa told dealer not to write repair order again, problem already looked at... but that was 600 miles ago and transmission problem notably worse (popped out of gear 3X in san francisco traffic). This seems to be common problem with Tacoma's, on tacomaworld and other places shows many folks with 2012's same problem. Toyota's avoiding an expensive fix: Shaking drive trains and bad gear boxes is not normal.

- San Carlos, CA, USA

At 300 miles I noticed upon downshifting ( I believe 3-2 or 2-1) a rumblestrip vibration feeling. I took the truck to the dealer and they said it was normal. It still occurs everytime I downshift (sometimes stronger feeling then other times) I researched previous years with the same complaint.. it cant be healthy for the transmission clutches. I now have 1300 miles...still happening...any thoughts?

- Williamstown, NJ, USA