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Electrical systemPart report

2006 Toyota 4RUNNER Electrical system Problems

Complaints
18about this part
Share
5%of 381 total for the year
Median mileage
109,404miles
Trend
FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.

NHTSA recorded 18 complaints about the electrical system of the 2006 Toyota 4RUNNER, 5% of the 381 complaints for this model year. Where a mileage was given, the median is 109,404 miles. 2 a fire, according to the filers.

Example complaints

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

“2006 4RUNNER rear glass exploded/shattered after using defrost - was denied reimbursement despite this being a known issue and faulty defrost connector. After dropping my 5 year old son off for school on 1/15/2021, I pulled up to a stop sign and heard a loud crash from the back of the car. I looked in the rear view mirror and the back glass had completely shattered and pieces were coming off into the back seat. Nothing had hit the window from the inside or outside - this happened spontaneously. …”

NHTSA complaint #11388319, filed 2021-01, 66,300 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

“On my way to the grocery store, my back window blew out while driving. It was a very loud pop! Which scared the daylights out of me! I looked in the review-mirror and the back window completely shattered. There was nobody around and I was driving too slow for it to have been a rock or debris. I was driving in san antonio texas near utsa blvd. In the turning lane, was in motion at a slow speed as I was pulling up to a red light. The mechanic at safelight auto said that it had to do with the electrical and saved the piece of where there was a short causing the blast. …”

NHTSA complaint #11386049, filed 2021-01, 183,000 miles

“I am the owner of a 2006 Toyota 4 RUNNER (mileage 66, 476 mls). I have been having the following experience vsc trac, check engine, and car anti skid light up simultaneously on my dash. It is very concerning because I am beginning to hear about other complaints of the same nature.”

NHTSA complaint #10304430, filed 2010-02, 66,476 miles

“I recently purchased a new 2006 Toyota 4 RUNNER. I have had nothing but motor transmission, electrical failures. I have only had my vehicle for 1 month and anything and every thing has gone wrong. I even had to give my daughter cpr on the side of the road due to carbon monoxide inhalation. She went into respiratory failure do to this she has severe asthma.”

NHTSA complaint #10154778, filed 2006-04, 1,200 miles

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
2026114%
2025813%
2024220%
202225%
202138%
202013%
2019812%
201847%
2017514%
20161822%
20151315%
20142431%
2013411%
201266%
201164%
201043%
2009418%
200855%
2007138%
2006185%
200592%
2004223%
2003122%
200231%
200163%
200041%
1999175%
1998114%
199762%
199632%
199563%
1993510%
1992611%
199011%

Other parts of the 2006 Toyota 4RUNNER

Body and structure
143 complaintsOther or unknown
78 complaintsSuspension
65 complaintsBrakes
34 complaintsTransmission and drivetrain
30 complaintsAir bags
24 complaintsSteering
22 complaintsVisibility (wipers, defrost, mirrors)
22 complaintsVehicle speed control
17 complaintsTires
13 complaintsEngine cooling
11 complaintsEngine
7 complaints

← All problems reported for the 2006 Toyota 4RUNNER

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 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