fairly significant
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
16,506 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.

2003 Toyota Sienna electrical problems

electrical problem

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2003 Toyota Sienna Owner Comments

problem #3

Oct 042011


  • miles


The contact owns 2003 Toyota Sienna. The contact stated the instrument panel on the vehicle does not work and when the vehicle exceeds 30-40 mph, it slows down and the all of the warning light illuminate. The local mechanic replaced the sensors for the computer, but that did not correct the problem. The vehicle was not inspected by a dealer. The failure mileage was unknown, but the current mileage was 74,000.

- Perph Anboy, NJ, USA

problem #2

Nov 212009


  • 49,516 miles
On 09/04/09, my 2007 Toyota corolla computer failure resulted in power lose within seconds at traffic light and stopped. This has been reported to NHTSA on 09/08/09 and complaint # is 10283338. However, my another Toyota car also had computer failure in Nov 2009. All of my 2 Toyota cars had computer failure in 2009. I believe the Toyota cars have computer problems and I suggest NHTSA to open investigation. 2003 Toyota Sienna computer failure resulted engine light illuminated around Nov. 21, 2009.

- North Potomac, MD, USA

problem #1

May 142009


  • 2 miles
Design defect on horn for 2003 Toyota Sienna. 1. only one out of the two horn bottom contact plates is electrically connected. 2. the steering wheel is not directly grounded by the spiral cable. Ground from spiral cable is used for the cruise control and remote radio control. The ground for the horn is only indirectly grounded through the shaft. I just haven't used the horn until recently. Horn is not reliable. Some times it doesn't work. Especially when pressing on the left side of the horn pad. Many people have been complaining of horn malfunction on Toyota car owner boards and Toyota not being able to repair it properly (replacing spiral cable and relay), on my van, the connection to the relay is missing (never installed) on the left side contact plate and active ground is missing. I have not figured out how to fix these safety defects.

- Irvine, CA, USA

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