2020 Chevrolet Blazer Electrical system Problems
- Complaints
- 78about this part
- Share
- 35%of 224 total for the year
- Median mileage
- 38,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 78 complaints about the electrical system of the 2020 Chevrolet Blazer, 35% of the 224 complaints for this model year. Where a mileage was given, the median is 38,000 miles. 1 a fire, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Rearview camera and back up camera constantly not functioning and going black while and motion or backing up. Car acts like there is something in front of it (like a wall) on certain roads and does not want to accelerate to turn/pull out from a stopped position. I have had this vehicle for 2 months. I have had a car prior to this that did this before and stopped and left me stranded on a busy road and caused an accident. I can't believe this car is acting like this!”
NHTSA complaint #11414919, filed 2021-05, 8,665 miles“After driving the vehicle for random periods of time and at random speeds, all the TPMS sensors will give alarms and then register as dashes on the dashboard. It gives alarms for each tire as each tire goes out until all of them go out. They will reset after a random period of time and start to show the pressure again.”
NHTSA complaint #11404794, filed 2021-03, 10,500 miles“I started receiving the message “steering assist reduced, drive with care” although I’ve noticed no reduction in power steering. This has happened multiple times. The A/C stops working, the Temperature Gauge moves to 0 degrees and the engine fan goes to maximum speed. I have noted that this is a common issue with the Blazer.”
NHTSA complaint #11662174, filed 2025-05“My car will be running fine but the lights on the AC panel wont work. My car will stop and shut down while driving. Ive taken it in for service and they told me my battery cabels were lose. The second time it happened I got a notification of low battery level and it shut off and will not start. I just replace the battery 2 years ago. The service department tested my battery and said it was fine”
NHTSA complaint #11735381, filed 2026-05“Check engine light on, message saying steering assist reduced drive with care , engine temperature gauge not moving from C, and AC not working. I have taken it in to be fixed 3x, and they have fixed it 2/3 times but the message has come back again. It is a big issue in 2019/2020 blazers according to my research.”
NHTSA complaint #11687241, filed 2025-09Related service bulletins
- 11019547Apr 22, 2025This service bulletin provides a procedure to test and replace the battery distribution fuse block if found the cause of the DTC and electric coolant pump inoperative.
- 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.
- 11017508Apr 3, 2025This service bulletin provides a procedure to add deadener to the batter tray bracket to correct customer concerns of a Service Engine Soon (SES), Reduced Power, Service Brake…
- 11017443Apr 2, 2025This service bulletin provides a repair procedure to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated - DTC P3055 Set.
- 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…
- 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…
- 11016948Mar 14, 2025This service bulletin provides repair information to correct a customer concern of Vehicle Will Lock and Unlock (Active Functions Work) but Will Not Crank or Start (Loss of…
- 11016946Mar 13, 2025This service bulletin provides repair information to correct a customer concern of No Crank, No Start, Quick Start/Stall, No FOB Detected, Key FOBs Inoperative, B3924 00, B3925…
- 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.
Electrical system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2025 | 11 | 32% |
| 2024 | 7 | 13% |
| 2023 | 7 | 16% |
| 2022 | 20 | 37% |
| 2021 | 40 | 28% |
| 2020 | 78 | 35% |
| 2019 | 62 | 33% |
| 2008 | 1 | 20% |
| 2006 | 2 | 11% |
| 2005 | 4 | 27% |
| 2004 | 10 | 20% |
| 2003 | 9 | 12% |
| 2002 | 21 | 9% |
| 2001 | 40 | 12% |
| 2000 | 49 | 8% |
| 1999 | 40 | 9% |
| 1998 | 71 | 10% |
| 1997 | 89 | 12% |
| 1996 | 62 | 5% |
| 1995 | 70 | 6% |
| 1994 | 10 | 2% |
| 1993 | 17 | 3% |
| 1992 | 18 | 6% |
| 1991 | 16 | 7% |
| 1990 | 4 | 13% |
| 1989 | 6 | 16% |
| 1988 | 5 | 13% |
| 1986 | 1 | 5% |
| 1985 | 1 | 3% |
Other parts of the 2020 Chevrolet Blazer
75 complaintsEngine
71 complaintsOther or unknown
57 complaintsSteering
43 complaintsBrakes
11 complaintsFuel system
5 complaintsLane departure
5 complaintsSuspension
4 complaintsVehicle speed control
4 complaintsAir bags
3 complaintsEngine cooling
3 complaintsForward collision avoidance
3 complaints
← All problems reported for the 2020 Chevrolet Blazer
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