2019 Toyota Sienna: hesitation when accelerating

Filed Jun 21, 2023 · Engine, Fuel system · KY

Car was recalled for fuel pump and I repaired in 8/2020 with approximately 11,190 miles. I had complained that car, since time of purchase and had 4662 miles when I insisted Toyota fix this, (hunted for gears, hesitated, lagged when accelerator pushed, and had poorer gas mileage than expected). The car now has 34,875 miles on it and is doing the same thing, hesitating, lunging between gears. Our mechanic confirmed this and stated worse when using a.c. Called Toyota Customer Service and they said the car was out of warranty for the pump repair, but perhaps not the power train, transmission, etc. Have not gotten back to me yet, but has not been one working day after spending 2.5 hours on the phone with them yesterday. This is a safety issue, I press on the gas to make a turn and it lags leaving me in traffic. My 2007 Sienna, which is still running for my daughter, never did this and has full power when called upon. Toyota needs to repair the entire fuel system, transmission, if they cannot fix this. There are no warning lights when this happens & it is happening more frequently. Dealership told me they could not put another pump on car and to contact Toyota Customer Service and gave me the number. When we had the car for about a month, dealership said we were just not used to driving a car with this type of transmission and car was low on oil, we added oil and dealership said we used the wrong type, but we figured some oil was better than no oil. We are boomers and have been driving cars for decades, with clutches and without and we know how to drive a vehicle.

Filed Nov 10, 2020 · Fuel system · 30,000 miles · LA

My fuel pump has been replaced by the dealer with the recalled part. The vehicle still does the same thing it has been doing since purchasing. It acts like it is not getting gas so hesitates multiple times constantly while driving. Sometimes I pull out and there is a delay in the engine getting gas then it kicks in and is a jerky ride. It mostly happens below 45 MPH. I have felt the delay occasionally above 55 MPH. The problem is not the fuel pump that they are recalling since I already have the new one and the problem is not fixed.

Filed Jan 15, 2020 · Acceleration, Engine · 12,000 miles · FL

Pulled out into oncoming traffic and vehicle hesitated and would not accelerate. Dash lights came on and car stalled. Attempted to crank van and it restarted but would barely move with the accelerator pressed fully. Had to call a tow truck to have it delivered to the dealer. I called toyota road side assistance number and 2.5 later no one showed up. Called again and demanded a different tow company respond and 30 minutes later someone was at the scene. This episode stated 230 pm and van was picked up 637pm.

Filed Nov 8, 2019 · Engine, Fuel system · 20,000 miles · LA

I pulled onto a highway and reaching about 25 MPH the 2019 sienna hesitated for at least 10 seconds as if it was not getting gas. I pressed the gas wanting to get out of the way of traffic and it jumped slightly but would not go. Then it kicked in with a few hesitations and took off. Another 100' or so, it did it again. Prior to this I had already brought it to toyota complaining that there is a hesitation when the van is not warmed up yet between 20-40 MPH. It is only slight, but noticeable and feels like it is not getting gas. The van does this every time after it has been sitting long enough to cool down. The long hesitation only happened twice so far (dangerous enough!), there have been a few shorter ones, and then there is the every time slight hesitation. Toyota has told me nothing shows in their diagnostics and they do not know what is wrong. They tried cutting the power to the computer to reset the memory, but this did not change anything.

Filed Mar 4, 2019 · Fuel system · 10 miles · MI

Immediately after purchasing this new 2019 toyota sienna I became aware of the vehicle having acceleration problems while attempting to accelerate gradually in a low speed/low torque setting. This occurs at what could be described as parking lot speeds, 5 to 25 MPH, primarily, although the vehicle hesitates and then lurches also at higher speeds when downshifting to gain torque in a 30-50 MPH range also. This hesitation, balking, and then rapid lurching forward at low speeds has caused passengers to comment about "whiplash" and being pushed back into their seats when the vehicle does engage with unexpected forward motion. This vehicle was purchased on 2-18-2019. After driving the vehicle for a reasonable amount of time and miles I contacted our sales agent who set a service appointment for monday feb 25, 2019. On 2-25-2019 I drove the vehicle to the dealer's service dept with "mileage in" of 250 mi. And "mileage out" of 251. Service invoice number 784852 states that the ecu was calibrated and reset. Upon driving the vehicle it became obvious that the problems were no different and perhaps worse. On march 1, 2019 I returned the vehicle to the dealer and took the service manager and a tech-expert for a ride. The tech acknowledged the stall and lurch phenomenon and said he "has dealt with this before". The tech and the service manager told me they were opening a case with toyota for possible input to resolve this problem. I believe this a serious potential safety issue as the forward lurching of the vehicle could result in serious injury as a result vehicle design and engineering. Other toyota owners have discussed this problem via internet forums. It would appear to affect 2018 & 2019 siennas with "throttle by wire" design and their 8 speed transmission.