2021 Toyota 4RUNNER Electrical system Problems
- Complaints
- 3about this part
- Share
- 8%of 36 total for the year
- Median mileage
- —not reported
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the electrical system of the 2021 Toyota 4RUNNER, 8% of the 36 complaints for this model year. 1 a fire, 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.
“Saturday morning July 12th after starting my vehicle, a warning was presented “SRS AIRBAG SYSTEM MALFUNCTION”. I immediately took it to the dealership where they ran diagnostics. The service advisor admitted he nor his mechanic had ever seen anything like that before. They were unable to detect the issue that day. We planned to return the vehicle Thursday July 17. I dropped it off at 10am and never heard from the dealership again that day. Friday, July 18th I contacted the service advisor around 10 am to get an update in which he said they were looking into it. …”
NHTSA complaint #11674658, filed 2025-07Related service bulletins
- 11028726Jan 30, 2026OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.
- 11028722Jan 28, 2026Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map…
- 11020657Jun 13, 2025The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service…
- 11019332Apr 2, 2025To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on…
- 11018329Apr 2, 2025To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on…
- 11016786Feb 11, 2025Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map…
- 11015500Feb 11, 2025Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map…
- 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…
- 10245474Oct 18, 2023Ti: technical instructions for 22tc01 data communication module (dcm) reprogramming certain 2021 model year c-hr, rav4 prime, tundra certain 2021-2022 4runner, highlander…
- 10238157May 30, 2023TSB: The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is reset, all previously registered…
Electrical system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2026 | 1 | 14% |
| 2025 | 8 | 13% |
| 2024 | 2 | 20% |
| 2022 | 2 | 5% |
| 2021 | 3 | 8% |
| 2020 | 1 | 3% |
| 2019 | 8 | 12% |
| 2018 | 4 | 7% |
| 2017 | 5 | 14% |
| 2016 | 18 | 23% |
| 2015 | 13 | 15% |
| 2014 | 24 | 31% |
| 2013 | 4 | 11% |
| 2012 | 6 | 6% |
| 2011 | 6 | 4% |
| 2010 | 4 | 3% |
| 2009 | 4 | 18% |
| 2008 | 5 | 5% |
| 2007 | 13 | 8% |
| 2006 | 18 | 5% |
| 2005 | 9 | 2% |
| 2004 | 22 | 3% |
| 2003 | 12 | 2% |
| 2002 | 3 | 1% |
| 2001 | 6 | 3% |
| 2000 | 4 | 1% |
| 1999 | 17 | 5% |
| 1998 | 11 | 4% |
| 1997 | 6 | 2% |
| 1996 | 3 | 2% |
| 1995 | 6 | 3% |
| 1993 | 5 | 10% |
| 1992 | 6 | 11% |
| 1990 | 1 | 1% |
Other parts of the 2021 Toyota 4RUNNER
13 complaintsSuspension
10 complaintsBrakes
6 complaintsWheels
4 complaintsExterior lighting
3 complaintsVisibility (wipers, defrost, mirrors)
3 complaintsBack-over prevention (rear camera)
2 complaintsForward collision avoidance
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