really awful
Crashes / Fires:
26 / 0
Injuries / Deaths:
10 / 2
Average Mileage:
60,933 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.

2004 Toyota Sienna engine problems

engine problem

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2004 Toyota Sienna Owner Comments (Page 5 of 5)

« Read the previous 20 complaints

problem #10

Sep 112004

Sienna 6-cyl

  • miles


There is a distinct delay in the acceleration of my 2004 Toyota Sienna van when the accelerator pedal is depressed quickly. This delay is not noticeable unless the driver is already moving and the accelerator is depressed in situations such as passing or some other activity that requires quick acceleration. I was trying to speed up while driving in the right hand lane of a highway because the left lane was already occupied and a vehicle was attempting to merge onto the roadway. My van did not speed up until it was too late and the vehicle attempting to merge onto the highway drove off of the road to avoid an accident. During another occasion requiring quick acceleration a truck locked up its' brakes to avoid hitting me from behind when I merged into his lane as I depressed the accelerator only to have the van fail to speed up for two seconds. Toyota personnel from the dealership where I purchased the van (world Toyota of chamblee, ga) informed me that they have received similar complaints but they are unable to correct the problem because it is the result of a design flaw in the vehicle in that Toyota installed a laser control on the accelerator in lieu of an accelerator cable that could be adjusted.

- Atlanta, GA, USA

problem #9

May 092004

Sienna 6-cyl

  • Automatic transmission
  • 200 miles
2004 Toyota Sienna exhibits poor low speed drivability when accelerating from slow speed. Throttle does not respond to pedal action which results in unpredictable acceleration time and amount. Poor, or no, engine response is followed by lurch forward as throttle (over) reacts and transmission searches for the proper gear. Many 'near misses' in traffic merging situations. The primary driver, my wife, will no longer use this vehicle. Several dealers have reviewed this issue and state that Toyota classifies this performance as a 'characteristic' of the 3.3L platform. This performance is not acceptable to me and vehicle will be replaced if not repaired soon.

- Pearland, TX, USA

problem #8

Aug 012004

Sienna 6-cyl

  • Automatic transmission
  • 4,850 miles
While parking, accelerating no more than 5 mph vehicle surged forward. Although I was applying the brake, the car would not stop until it ran into a tree trunk. I will be making an appointment with oakbrook Toyota in westmont, il to replace the broken foglight that occurred during the collison as well as research the problem and hopefully apply a fix.

- Downers Grove, IL, USA

problem #7

Jul 152004


  • miles


I noticed an article recently about a probe into Toyota's (Camry and Lexus) that surge. My 2004 Toyota Sienna surges forward when braking and though it does not do this consistently, it happens every so often and could potentially cause an accident. I have reported this to the dealer and they have examined the vehicle and said that there is nothing wrong. My personal experience with the electronic throttle control is that not only does it surge when braking, there is also a delay in the signal when accelerating that either causes an unsafe delay in entering into traffic and can also cause the vehicle to "peel out" from a stopped position. I basically feel unsafe in this vehicle, yet my concerns voiced to the dealer have been dismissed. This defect needs to be seriously monitored in Siennas as well as other Toyota with the electronic throttle control.

- Columbia, MD, USA

problem #6

Dec 152003

Sienna 6-cyl

  • Automatic transmission
  • miles
Engine idles very fast in cold weather first few minutes. While driving a block to the first stop sign has to apply the brakes very forcefully to get the car to stop. This causes some loss of control, especially on a slight down hill slope during snowy/icy weather. Appears to be combination idle, and the automatic transmission.

- Geneva, IL, USA

problem #5

May 312004

Sienna 6-cyl

  • Automatic transmission
  • 9,900 miles
Vehicle hesitates/fails to move forward in the following mode: After braking, when the vehicle is still moving between 5 to 15 mph, the van does not respond to accelerator pedal input; vehicle hesitates with no movement forward, then shifts hard into first gear and lurches forward. We have had 2 close calls, waiting for the vehicle to respond to accelerator pedal input. Also, accelerator pedal has a dead spot. The first half inch of pedal causes no response from vehicle). This "dead spot" along with the hesitation noted above can result in a 2 second response failure from the vehicle. This situation has put my family in harms way on numerous occasions.

- Pottstown, PA, USA

problem #4

Mar 122004

(reported on)


  • miles


When driving at an undetermined speed vehicle surged. Consumer took the vehicle back to the dealership for inspection.

- Oak Ridge, NC, USA

problem #3

Aug 012003

Sienna 6-cyl

  • Automatic transmission
  • miles
Recurring drivability problem with 2004 Sienna xle 3.3L. After decelerating then reapplying throttle, surge varies from annoying to dangerous. On occasion, is severe enough to squeal tires. From a dead stop, throttle response is better but from a rolling stop, dangerous and inconsistent.

- Southbridge, MA, USA

problem #2

Dec 142003


  • 4,000 miles
While parking, the vehicle surged forward. As a result the vehicle collided into a fence. The dealer stated they were unable to duplicate the problem. Please provide additional information.

- Auburndale, MA, USA

problem #1

Nov 282003

Sienna 6-cyl

  • Automatic transmission
  • 1,000 miles
2004, Toyota Sienna xle limited. Very sluggish throttle response when cruising, apparently due to very sluggish automatic transmission down shift. No problem when accelerating from a stop. Problem is bad enough to cause an accident when the driver expects reasonable throttle response to avoid a collision, such as crossing an intersection.

- Phoenix, AZ, USA

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