2021 Toyota 4RUNNER Forward collision avoidance Problems
- Complaints
- 2about this part
- Share
- 6%of 36 total for the year
- Median mileage
- 637miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the forward collision avoidance of the 2021 Toyota 4RUNNER, 6% of the 36 complaints for this model year. Where a mileage was given, the median is 637 miles. 1 of these say a crash was involved, according to the filers.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“While driving in a snowstorm on an interstate highway at night on 1/25/2021, two important safety systems failed due to ice and snow buildup on the vehicle. Failure 1: the pre collision system (pcs) warning light illuminated indicating temporary failure of the pcs system (see photo 1). This was due to ice and snow buildup on the forward sensor, located on the front grille (see photo 2). Problem could only be rectified by stopping and physically removing the ice buildup, as referenced in the Toyota owner's manual, page 252. …”
NHTSA complaint #11390053, filed 2021-01, 637 miles“was going to work on rt 80 east had cruise control on and was getting off exit 45 in new jersey to get bus into manhattan at approx 430 amwhile getting off highway stepped on brakes pedal went to floor tried pumping nothing happened nor did criuise control disengage or collision warning come on a total collapse of system had this car for approx 1 month purchased used at paramus mercedes benz took this vehicle to my mechanic for a full inpection everything was good vehicle had approx 22000 miles on it at purchase lost all control and crashed going off roadway and sliding down bridge abuttment…”
NHTSA complaint #11505501, filed 2023-02Related service bulletins
- 10247828Nov 28, 2023TSB: All 2020 ? 2023 model year 4Runner, 2018 ? 2022 model year Sequoia, 2018 ? 2023 model year Tacoma, and 2018 ? 2021 model year Tundra vehicles are equipped with Pre-collision…
- 10187245Dec 15, 2020TSB: All 2018 ? 2021 model year Sequoia, Tacoma, and Tundra and 2020 ? 2021 model year 4Runner vehicles are equipped with Pre-collision System (PCS) and Dynamic Radar Cruise…
- 10186199Dec 15, 2020TSB: All 2018 ? 2021 model year Sequoia, Tacoma, and Tundra and 2020 ? 2021 model year 4Runner vehicles are equipped with Pre-collision System (PCS) and Dynamic Radar Cruise…
Forward collision avoidance: other model years
Other parts of the 2021 Toyota 4RUNNER
13 complaintsSuspension
10 complaintsBrakes
6 complaintsWheels
4 complaintsElectrical system
3 complaintsExterior lighting
3 complaintsVisibility (wipers, defrost, mirrors)
3 complaintsBack-over prevention (rear camera)
2 complaintsOther or unknown
2 complaintsAir bags
1 complaintsFuel system
1 complaintsLatches, locks and linkages
1 complaints
← All problems reported for the 2021 Toyota 4RUNNER
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 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