2021 Chevrolet Suburban Electrical system Problems
- Complaints
- 19about this part
- Share
- 9%of 203 total for the year
- Median mileage
- 78,224miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 19 complaints about the electrical system of the 2021 Chevrolet Suburban, 9% of the 203 complaints for this model year. Where a mileage was given, the median is 78,224 miles. 1 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Had an engine replacement in dec of 2025 and had to pay for it since wasn’t under warranty or recall. And now my replacement engine which has a warranty now. Just failed in March 2026 which about 3 months later. Had metal shavings in engine and multiple cylinders misfiring. And now I don’t have a family vehicle to drive my family around again. There should’ve been a recall on my engine, but wasn’t this is not fair. And I’m paying the price for it.”
NHTSA complaint #11729192, filed 2026-04“I was driving our 2021 Chevy Suburban, which had ~107,000 miles on it, at approximately 75 miles per hour. With no other indication, the low oil pressure light came on, then within two seconds I lost all power (motor shut off) and lost electronics in the car. I had to man-handle the vehicle to get it off the road without power or dash controls. Our family was stranded near the California/Nevada border with no cell reception in the middle of the night for over seven hours. …”
NHTSA complaint #11638102, filed 2025-01“I am submitting this complaint to report a serious safety issue involving my 2021 Chevrolet Suburban equipped with the 3.0L Duramax diesel engine. The vehicle has experienced a recurring problem related to the engine wiring harness. While driving, the vehicle will unexpectedly stall without warning. At the same time, there is an immediate loss of power steering assist, significantly reducing the ability to safely control the vehicle. This creates a dangerous situation, especially at highway speeds or in traffic. …”
NHTSA complaint #11725782, filed 2026-03“Multiple issues with transmission since owned. It randomly goes into limp mode and everything will blink and it won't start back. The transmission has always shifted hard and sounded funny they told me if was normal for the vehicle. Leaking transmission fluid when owned for 4 months. I have had to the dealer multiple times, several repairs, told it is safe to keep driving by GM. The inverter is bad and told me it was ok to drive until they can repair. GM will not give me a fair response or answer. …”
NHTSA complaint #11503779, filed 2023-01“A warning message appeared on my 2021 Chevy Suburban dashboard that says Service Safety Restraint System . This impacts the airbag control module under the driver seat. After doing some research on my own this is a TSB PIT5759 but it is not covered under a recall, as per my local dealership. I took the vehicle to the Chevy dealership where purchased and was told this is not a recall or warranty part. This is very disappointing as it impacts the airbag controls which in an accident could cause severe injury or death.”
NHTSA complaint #11601501, filed 2024-07Related service bulletins
- 11024486May 16, 2025This bulletin advises the tech to inspect deeper into what may be to main cause of an engine failure.
- 11019017Apr 10, 2025This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system that may be causing a drain.
- 11017595Apr 3, 2025This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs, such as Wiring Harness Repairs.
- 11017244Mar 31, 2025The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple customer concerns that do not have other…
- 11017255Mar 25, 2025This service bulletin helps diagnose/reduce possible CCND issues on Transfer Cases - Service 4WD on DIC, Intermittent Failures, Noise Concerns, Driveline/Steering…
- 11017207Mar 21, 2025This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414…
- 11017031Mar 12, 2025This service bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and testing those batteries.
- 11016912Mar 5, 2025This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regard to the power sliding…
- 11014602Feb 17, 2025This bulletin provides information to the tech on how to diagnosis the EGR system from possible issue that may cause the DTCs to set and cause the customers concern of a MIL…
- 11014230Jan 31, 2025This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
Electrical system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2024 | 5 | 11% |
| 2023 | 14 | 11% |
| 2022 | 22 | 18% |
| 2021 | 19 | 9% |
| 2020 | 8 | 18% |
| 2019 | 7 | 9% |
| 2018 | 17 | 20% |
| 2017 | 21 | 15% |
| 2016 | 26 | 12% |
| 2015 | 58 | 13% |
| 2014 | 7 | 12% |
| 2013 | 14 | 12% |
| 2012 | 10 | 10% |
| 2011 | 10 | 7% |
| 2010 | 9 | 8% |
| 2009 | 16 | 15% |
| 2008 | 22 | 10% |
| 2007 | 25 | 9% |
| 2006 | 3 | 13% |
| 2005 | 36 | 28% |
| 2004 | 72 | 35% |
| 2003 | 81 | 27% |
| 2002 | 10 | 4% |
| 2001 | 30 | 7% |
| 2000 | 13 | 5% |
| 1999 | 58 | 9% |
| 1998 | 14 | 7% |
| 1997 | 42 | 10% |
| 1996 | 47 | 13% |
| 1995 | 32 | 7% |
| 1994 | 21 | 2% |
| 1993 | 7 | 1% |
| 1992 | 9 | 5% |
| 1991 | 2 | 4% |
| 1990 | 3 | 6% |
| 1989 | 1 | 2% |
| 1987 | 2 | 11% |
| 1986 | 1 | 14% |
Other parts of the 2021 Chevrolet Suburban
89 complaintsTransmission and drivetrain
39 complaintsFuel system
32 complaintsOther or unknown
14 complaintsEngine cooling
11 complaintsForward collision avoidance
11 complaintsBrakes
9 complaintsExterior lighting
7 complaintsSeat belts
7 complaintsAir bags
6 complaintsWheels
4 complaintsLane departure
3 complaints
← All problems reported for the 2021 Chevrolet Suburban
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 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