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Other or unknownPart report

2006 Toyota 4RUNNER Other or unknown Problems

Complaints
78about this part
Share
20%of 381 total for the year
Median mileage
135,940miles
Trend
FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.

NHTSA recorded 78 complaints about the other or unknown of the 2006 Toyota 4RUNNER, 20% of the 381 complaints for this model year. Where a mileage was given, the median is 135,940 miles. 2 of these say a crash was involved and 1 a fire, according to the filers.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“Major frame rust. The body is still great but when you look underneath it's a different story. I can flake off pieces of the frame with my finger. My mechanic says it may only have a couple of years left. I will have to take it to a dealership to get their opinion on the matter.”

NHTSA complaint #11331575, filed 2020-06, 152,000 miles

“Vehicle frame is rusting faster than normal. Have had to replace many suspension parts, welded front alignment tabs to keep vehicle in line, replaced vehicle suspension but unsure how long this will last due to frame still flaking. Toyota dealer states that the rust is severe and when I had my rear upper control arms replaced, stated that the mount bracket was very thin and causing movement in the rear of my vehicle.”

NHTSA complaint #11138847, filed 2018-10, 156,044 miles

“The frame of my 4RUNNER is excessively rusted and corroded. It is flaking off in big pieces from the outside of the frame as well as the inside of the frame. In a couple of locations, it has corroded so much that there is a 1.5 diameter hole in the frame. Other areas that are very important structurally and for suspension, has severe rust and I'm worried that those areas will crack and cause me to lose control while driving.”

NHTSA complaint #11133488, filed 2018-10, 125,000 miles

“I was driving down the highway using my rear defroster when my back window shattered without cause, it sounded like a gunshot. The shock caused me and the driver behind me to both swerve almost causing two wrecks.”

NHTSA complaint #11220541, filed 2019-06, 145,000 miles

“While I was I driving on the highway, the rear window exploded while I was using the rear window defroster. I smelled a burning smell just prior to it exploding glass all over the back cargo area”

NHTSA complaint #11288258, filed 2019-12, 136,000 miles

Related service bulletins

Other or unknown: other model years

YearComplaintsShare of year
2026229%
2025915%
2024220%
20231236%
2022821%
202126%
2020927%
20191218%
2018915%
20171439%
20161822%
20151416%
20141114%
20131028%
201266%
201196%
201085%
200929%
20081213%
20072114%
20067820%
20056816%
200412118%
200311116%
20023214%
20012514%
20006012%
19993711%
1998166%
1997218%
1996127%
199595%
199446%
199023%
1988111%

Other parts of the 2006 Toyota 4RUNNER

Body and structure
143 complaints
Suspension
65 complaints
Brakes
34 complaints
Transmission and drivetrain
30 complaints
Air bags
24 complaints
Steering
22 complaints
Visibility (wipers, defrost, mirrors)
22 complaints
Electrical system
18 complaints
Vehicle speed control
17 complaints
Tires
13 complaints
Engine cooling
11 complaints
Engine
7 complaints

← All problems reported for the 2006 Toyota 4RUNNER

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology