"How reliable is the 2003 Toyota Sienna?"

"Based on 124 NHTSA complaints, the 2003 Toyota Sienna has a median complaint mileage of 51329 miles. The most common issue is VEHICLE SPEED CONTROL."

"What are common problems with the 2003 Toyota Sienna?"

"The most frequently reported component in NHTSA complaints for the 2003 Toyota Sienna is VEHICLE SPEED CONTROL, accounting for a significant portion of the 124 total complaints filed."

2003 Toyota Sienna: Reliability Data

Source: NHTSA — 124 complaints

124

Total Complaints

51,329mi

Median Mileage

VEHICLE SPEED CONTROL

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

17,505 25th Percentile

51,329 Median Mileage

94,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

VEHICLE SPEED CONTROL

LATCHES/LOCKS/LINKAGES

LATCHES/LOCKS/LINKAGES:DOORS:LATCH

POWER TRAIN:AUTOMATIC TRANSMISSION

STRUCTURE:BODY:DOOR

TIRES

STRUCTURE:BODY

SERVICE BRAKES, HYDRAULIC

SUSPENSION

FUEL SYSTEM, GASOLINE

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"I AM DISAPPOINTED WITH TOYOTA TO ONLY HAVE ONE TETHER RESTRAINT IN THE 2ND ROW. SO IF YOU HAVE TWO SMALL CHILDREN IN CAR SEATS THEY BOTH CAN'T BE TETHERED IN THE 2ND ROW. ALSO THE PLACEMENT OF THIS 2ND ROW TETHER IS TERRIBLE! IT INTERFEARS WITH THE PERSON IN THE 3RD ROW, THEIR FEET GET TANGLED IN ..."

"UNSAFE DESIGN OF OVERDRIVE FEATURE ON TOYOTA SIENNA. EVERY TIME CAR IS PUT INTO DRIVE, IT DEFAULTS TO 'OVERDRIVE' MODE - WHICH MEANS IT IS FREE WHEELING WHENEVER DRIVER'S FOOT COMES OFF THE ACCELERATOR. NO ENGINE BRAKING!! TAKE YOUR FOOT OFF THE GAS AND THE CAR ROLLS FREELY. THIS IS GROSSLY UNSA..."

"THE VEHICLE PULLED SEVERELY TO THE LEFT. *JB"

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28