Automatic Transmission Control Module Problems of Toyota Avalon

S10 appropriate handling re Toyota vehicle sudden acceleration problem, owner of a 2006 Toyota Avalon experienced acceleration problem. Immediately after purchasing the vehicle, the consumer noticed a problem in accelerating, decelerating and shifting gears in the transmission. Since the vehicle was still under warranty, he took the vehicle back to the dealer a few weeks later. The dealer informed the consumer there was no major problem and that a minor adjustment was made to the shifting points in the transmission. The vehicle functioned fine for a while, but then the same problems quickly resurfaced. A Toyota representative stated the problem was not a defect; rather it was the way the vehicle was intended to handle due to its drive-by-wire system. The representative went on to say the drive-by-wire system did not have a traditional rod that connected the pedal to the engine; rather, the pedal went to an electronic system that sensed the intended acceleration and causes the engine to accelerate as directed by the driver. The consumer was told the hesitation he complained of was normal as the system was determining how much to accelerate. The consumer did not believe the sudden acceleration was due to a sticking pedal; rather a problem within the electronic transmission control module, throttle or onboard computer.

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2006 Toyota Avalon. At low speeds, especially after slowing, the transmission acts as if it were in neutral, and severely hesitates, when an attempt is made to accelerate. Dealer says it's normal. There are years of complaints all over the web. I can't believe that some have not been rear-ended or struck when attempting to accelerate into traffic from a highway entrance ramp. Toyota should be forced to redo the programming of the responsible computer chip or replace the chip with one that has a faster clock speed. They should also be held legally responsible for all incidents. The date below is for the latest of near daily, usually minor failures like slowing to turn a corner.

I own a 2005 Avalon that has a transmission/throttle problem. Slowing from speeds in excess of 30 mph, then accelerating moderately, the engine will increase rpm to 2500-3000 rpm and the transmission will shift into neutral until the electronic control decides to shift to a lower gear. At the shift point the car will surge forward rapidly. This surge occurs even on this vehicle with traction control. This "surge" has resulted in multiple near end collisions in city traffic. The neutral shift problem has also been encountered on occasion when entering high speed interstate traffic. 18 wheelers bearing down on you at speed while your car is turning 4000 plus rpms in neutral is frightening. The vehicle has been to three separate dealers and a complaint was registered with Toyota manufacturer. Toyota responded, saying the transmission was operating as designed. Hopefully someone will correct this problem before I, and others, become a statistic in a class action suit as an injury or death numbers. Many complaints on this problem can be found on several other web sites. I've been a Toyota owner for over 25 years and this lack of response by the manufacturer on this high end of the brand ends that . And Toyota does not care if they lost a long term customer, so stated by Toyota of America.

See all problems of the 2005 Toyota Avalon 🔎.

Noticing hesitation at low speed gear shifting . Results in no acceleration in spite of pressing the accelerator and after a lag car suddenly responds. Had trouble while merging from the ramp on to the highway now several times, but not daily. Concerned that this may result in an accident specially while merging or driving at low speeds in heavy traffic. This problem has caused me to bump into a truck resulting in damage to my right front fender.

Purchased a certified, used 2006 Toyota Avalon touring model on July 15, 2006. Within the first week of ownership, I noticed a serious hesitation in the transmission, especially at speeds below 10 mph. I took the vehicle to koons Toyota dealership on July 8, 2006 and had the service department shop foreman, drive the vehicle. He confirmed that the transmission was indeed hesitating and that this was a problem for 2004-2006 Toyota siennas, Avalons and camrys that share the same 5-speed automatic transmission. Chris told me that the computer that selects the appropriate gear based on various criteria analyzed by the system is too slow in processing this information, which in turn causes the hesitation and rpm surge before a gear is engaged. I lodged a complaint with Toyota today (case number 200608090063), and was told that the "corporate line" is that the transmission is behaving as was intended. The dealer told me this issue can be fixed by a reprogramming of the computer or replacing the chip with a "faster" version. Obviously, this is a terribly dangerous situation that Toyota needs to address.

The first week I owned the car I noticed a hesitation in the accelerator followed by a lurching forward. Took it to dealer who said it was caused by the drive by wire system and would adjust to my driving in time. No adjustment occurred. I continued to make complaints to no avail until I threatened write to NHTSA. They then said "wait, don't do that. We'll talk to the service manager to see if he has a fix. Within 30 minutes they had recalibrated the engine control module/ecm (sae term: powertrain control module/pcm). Warranty information was: op code eg7023; description recalibrate emc (pcm); time 0. 9; ofp 89661-#####; t1 26; t2 99. The results were good although I sometimes still feel almost undetectable small surges when I am driving as if I am not really controlling the speed with the accelerator. By the way, I had reported this twice before and when I read through all of the 2006 Avalon reports mine was not there. Are the reports deleted after a period of time?.

2005 Toyota Avalon - automatic transmission - control module I just purchased 2005 Toyota Avalon limited. I experience terrible transmission hesitation/slippage. It is getting dangerous when I have to enter highway ramp because of transmission hesitation. When I coast at low speed, for example, I notice a red traffic light ahead and take my foot off the gas, the car then continues forward as if in gear and after a period of time it feels as if the transmission shifts to neutral, the rpms drop to below 1,000. Then the traffic light changes when my speed is about 5 - 10 mph and I slowly depress the accelerator. The engine rpms increase about 300 - 500 rpms but there is no acceleration. Then the transmission gets the message and we start to accelerate.

Since purchasing the Avalon in early June, I have been frustrated with how the car operates between 20 and 40 miles per hour. The car does not always know what gear it needs to shift into. It will frequently race 1000 rpm ahead without any change in speed. Then suddenly it will accelerate and the rpm's will drop back to normal rpm. It seems to happen most often in rush traffic when trying to change lanes. The hesitation in acceleration will cause me to lose most of my margin of safety in the process of changing lanes. In this regard, the car is not safe. There is no way to predict when the problem will occur, and therein, lies the safety hazard. It would seem that the last effort by the service department to update my computer programming failed to achieve any level of improvement to my satisfaction with one exception. Since the first computer upgrade, I have not experienced the complete loss of gear at high speeds. Is this a problem in all 2005 Avalons? is Toyota aware of the problem and do they have plans to resolve it? serviced on Friday, October 21. Toyota reset the computer learning back to factory default. Technical support in CA explained that there are no current plans to address the issue. Once the learning process develops a bad pattern, it must be reset back to factory default and the relearning started over. The problem started all over again and there is no "unlearning" the problem.

I recently purchased a 2005 Toyota limited. The transmission poses safety problems because it is very uneven and unpredictable, shifting when you don't expect shifting, at lower and higher speeds and in cruise control. (see the on-line discussion forum at edmunds website regarding this problem which many owners are experiencing.

I have had repeated problems with the automatic electronic transmission in my Toyota Avalon 2005 limited over the past month. I have had the car to the dealership to have diagnostics done. The dealership told me there is nothing wrong with my car and I would have to "train" my car computer to drive. I have over 1500 miles on the car and I continue to have the same problems. I drive the car and make starts and stops several times without issue, then at the next stop I start out and the car seems to shift immediately to a higher gear and I have to hit the brakes to avoid hitting other cars. Other times, I will press the gas pedal and have no response for several seconds before the car takes off. It makes it very difficult to merge into traffic as I never know when the car will go or not go. There are yet other times that it will start off normally and then seem to get stuck in what seems like second gear and rev for several seconds before shifting. Previously, I have pressed the gas pedal and ended up lurching forward when the shift finally occurred. Now I let it rev until it shifts itself with no additional gas pedal depression. While this has stopped the lurching, it has left me venerable in that I can not depend on when the car will accelerate so I can avoid accidents with other vehicles, people, and objects. This has been quite frustrating. I consider it a matter of my life and death because I take coumadin and if I am in an accident, it could and quite possible would cost me my life. Please let me know what can be done to encourage Toyota to deal with this problem.

Traction control system performing poorly causing the "skid" light to come on and the vehicle to stall.

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When accelerating into traffic from a stop, the traction control system engages too quickly and stays engaged too long, severely reducing power available to properly merge into traffic.

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When the speed of the front wheels is greater than the rear wheels, the traction control system shuts off gas to the engine, causing engine to hesitate.