6.6

fairly significant
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
10,241 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2020 Toyota Sienna drivetrain problems

drivetrain problem

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2020 Toyota Sienna Owner Comments

problem #3

Sep 252022

Sienna

  • miles

A D V E R T I S E M E N T S

For a month prior, there were intermittent incidents of the van shuddering and the RPM needle jumping upon ignition. Sometimes the van would have a hard time accelerating before jerking and driving normally. No issues before this started in late July and no indication when/where would occur. -€¢September 15: drove the van all day running errands. It drove normally. Filled up the gas tank (Gulf gas station), then continued errands. About a half hour later, while at a stop sign, a notification appeared that the -€œTraction Control System has been turned off-€ and the check engine light came on. Tried to move through the stop sign, but the van would barely go. Applied the gas, but no results. Able to turn onto a side street and had to have it towed to Toyota of Irving. The Service Advisor stated the issue was due due to bad gas and indicated the van needed to be flushed and the fuel injection system cleaned. Paid $725 for these repairs. -€¢September 17: Started van in driveway. Shuddering and RPM needle jumping again. Drove normally. -€¢September 21: Same as above. -€¢September 25: Drove the van all day with no issues. Filled up with Valero Plus gas. As we pulled out of the gas station and sitting at the light, the Traction Control message and check engine light again appeared. The van would barely go to get us through the traffic light and into a nearby parking lot. Once we parked, the screen displayed the following message:"A malfunction in the electronic control of the engine, throttle, or automatic transmission has been detected." Had the vehicle towed to Toyota of Irving. The service advisor called 2 days later to say they cannot detect any issues.

- Irving, TX, USA

problem #2

Feb 032021

Sienna

  • miles
Car has about 16,000 miles. When accelerating slowly from a stop, vehicle hesitates, shakes, and runs rough as it slowly progresses thru first, second, & third gears. After transmission gets in fourth gear, hesitation and roughness goes away. This issue is rapidly getting worse.

- Townsend, TN, USA

problem #1

Dec 232020

Sienna

  • 30,723 miles
Purchased rental program vehicle and immediately had vehicle serviced at the dealership. Received a phone call from service advisor that automotive technician had found a mechanical problem. It was stated that a hose had come loose/apart in the axle and fluid was leaking. Now, we had purchased vehicle day before and the following day dropped vehicle for service at dealership. As a consumer, I need a maintenance baseline. The brief time driving the vehicle, there was no visible/audible clue that mechanical issue was present. Exact description of warranty work performed [driver side front axle assembly, axle coming apart internally] replaced driver side front axle assembly. Fortunately, vehicle was being serviced and this component did not fail while in motion.

- San Antonio, TX, USA

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