2020 Chevy Blazer LT 3.6 L V6 I'm filing this complaint regarding multiple concerning mechanical and safety related issues with my 2020 Chevy Blazer LT that I purchased brand new and currently have 54,224 miles . Without warning, My vehicle developed several problems simultaneously. The check engine light came on, The engine cooling fan started running continuously at high speed, the AC stopped blowing cold air and is warm air, the steering assist reduced came on and my chevy app notified me that I have an engine cooling system malfunction and to service now. It's showing a P0128 code when I had it checked. After doing some research, I discovered GM issued a thermostat special coverage program for certain vehicles 2021-and newer models. Mine isn't part of it because of the year and isn't covered by the power train warranty for the same reason even though they all have the same engine. I only have 54,000 miles! I'm very concerned over the steering assist being reduced! What if the steering goes out while I'm driving? I have my grandchildren all the time. I need my car! There are several other complaints on here for the same vehicle and the same problem! Why isn't the 2020 Blazer covered under this special coverage program? The dealerships all say it's a well known problem! I believe this issue deserves investigation !
The worst 2020 Chevrolet Blazer problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Electrical78
- Transmission75
- Engine74
- Steering43
- Brakes11
- Driver assistance8
- Fuel system5
- Acceleration4
- Suspension4
- Airbags3
- Tires3
- Wheels3
- Body1
- Lights1
- Seat belts1
- Seats1
Specific symptoms reported on the 2020 Chevrolet Blazer
Check engine light 41Overheating 14Won't shift 7Loss of power 6Power steering loss 6Stalling 6Hesitation 5Jerking 5Slipping 5
Trouble codes owners of the 2020 Chevrolet Blazer mention
P0128 16P01F0 3P0208 3P0024 2
Recalls 3
Tires
- What is wrong
- General Motors LLC (GM) is recalling certain 2020 Buick Enclave, Cadillac XT4, XT5, Escalade, Escalade ESV, Chevrolet Suburban, Tahoe, Traverse, GMC Yukon, Yukon XL, 2018-2021 Chevrolet Express, GMC Savana, 2019-2020 Chevrolet Blazer, Silverado 1500, GMC Acadia, Sierra 1500, and certain Continental tires sold to the aftermarket for various model year 2018-2021 vehicles. The affected tires were cured for too long during production.
- Risk
- Over cured tires may develop a break in the sidewall resulting in sudden air loss or a belt edge separation which could lead to a tread/belt loss. Either condition can cause a loss of vehicle control, increasing the risk of a crash.
- Remedy
- GM will notify owners, and dealers will inspect the tires, replacing them as necessary, free of charge. The recall began March 22, 2021. Owners may contact GMC customer service at 1‑888‑988‑7267, Buick customer service at 1‑866‑608‑8080, Chevrolet customer service at 1‑800‑222‑1020 or Cadillac customer service at 1‑800‑458‑8006. GM's number for this recall is N212329050.
Recall number 21V115000 · Recall details
Power train: automatic transmission
- What is wrong
- General Motors LLC (GM) is recalling certain 2018-2019 Chevrolet Cruze and Buick LaCrosse, 2018-2020 Chevrolet Equinox, Chevrolet Traverse and GMC Terrain, 2018 Chevrolet Malibu, 2019-2020 Buick Encore, Buick Enclave, Cadillac XT4, Chevrolet Blazer and GMC Acadia, and 2020 Cadillac XT6 vehicles. The start/stop accumulator endcap may have missing bolts.
- Risk
- Missing bolts on the start-stop accumulator endcap could result in a transmission oil leak and may progress to a loss of propulsion, increasing the risk of a crash. A transmission fluid leak in the presence of an ignition source may increase the risk of fire.
- Remedy
- GM will notify owners, and dealers will inspect the start-stop transmission accumulator and replace it if any bolts are missing, free of charge. The recall began December 15, 2020. Owners may contact GMC customer service at 1‑888‑988‑7267, Buick Customer service at 1‑866‑608‑8080, Chevrolet customer service at 1‑800‑222‑1020 or Cadillac customer service at 1‑800‑458‑8006. GM's number for this recall is N202313440.
Recall number 20V668000 · Recall details
Air bags: side/window: curtain: inflator
- What is wrong
- General Motors, LLC. (GM) is recalling certain 2020 Buick Enclave, Cadillac XT5 and XT6, Chevrolet Blazer, Silverado 1500, 2500 and 3500 and Traverse and GMC Acadia and Sierra 1500, 2500 and 3500 vehicles. The diffuser component of the Roof-Rail Air Bag (RRAB) inflator may not have been properly crimped to the inflator and could separate from the inflator during air bag deployment.
- Risk
- If the diffuser separates from the inflator during deployment, RRAB performance may be degraded, increasing the risk of injury in a crash.
- Remedy
- GM will notify owners, and dealers will replace the suspect RRAB modules, free of charge. The recall began September 3, 2020. Owners may contact Chevrolet customer service at 1‑800‑630‑2438, Cadillac customer service at 1‑800‑333‑4223, or Buick customer service at 1‑800‑521‑7300. GM's number for this recall is N202305380.
Recall number 20V446000 · Recall details
Technical service bulletins for the 2020 Chevrolet Blazer 856
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- This service bulletin provides information about GM Accessories
- • Improvements to OnStar functionality.
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
- Unknown or other
- PI to help diagnose A/C concern
- Unknown or other
- Unknown or other
- Unknown or other
- Unknown or other
- Unknown or other
2020 Chevrolet Blazer fuel economy
Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.
| Engine | Drive | City | Highway | Combined |
|---|---|---|---|---|
| 2.0L 4‑cyl | FWD | 21 | 28 | 24 |
| 2.5L 4‑cyl | FWD | 21 | 27 | 23 |
| 2.0L 4‑cyl | AWD | 21 | 27 | 23 |
| 3.6L 6‑cyl | FWD | 19 | 26 | 21 |
| 3.6L 6‑cyl | AWD | 18 | 25 | 21 |
What 2020 Chevrolet Blazer owners say
Most recent owner complaints, unedited.
Warning on console “Steering Assist is Reduced Drive with Care” and radiator fan turns on right away at full speed.. this has been reported in similar models and years.. but does not include this particular vehicle year and VIN
My 2020 Chevrolet Blazer experienced severe mechanical problems, including stuttering, loss of power, and the engine shutting off unexpectedly while I was driving. The vehicle subsequently would not operate normally. On February 25, 2026, Rick Hendrick Chevrolet Duluth performed a diagnostic inspection and recommended nearly $20,000 in repairs, including transmission-related repairs. However, the dealership did not identify or disclose any alternator fire damage or related electrical safety concerns. In October 2026, an independent mechanic discovered significant burn damage on the alternator. The damage was visible externally, and further inspection of the alternator’s interior revealed additional evidence of burning. I believe this condition may have contributed to the vehicle’s sudden loss of power and shutdown. This presents a serious safety concern because an unexpected engine shutdown while driving can increase the risk of a collision, and an electrical failure involving burning components may present a fire hazard. The vehicle has not been driven since the dealership’s inspection. The damaged alternator has been preserved, and photographs were taken documenting its condition. The component is available for further inspection upon request. I am requesting an investigation into this alternator failure and the associated vehicle safety risks.
The thermostat is malfunctioning along with engine temperature coolant sensor. This causes the temperature gauge on the dashboard to be completely disabled and not moving off cold, it disables the air conditioner, makes the engine cooling fan to run extremely high nonstop, and places the vehicle into an unpredictable limp mode or fail safe mode. This was identified as faulty by GM and they have issued a special service bulletin that they will repair it up to a 150,000 miles or 15 years or reimburse customers up to $1200 on 2021 models. The 2020 models use the same engine and parts but they refuse to include them which is an unfair exclusion since they admitted to a faulty part. 2020 should be included with the same 150,000 miles and 15 year coverage or reimbursement.
The radiator and thermostat on my 2020 Blazer had to be replaced at less than 35,000 miles. It was out of warranty and the Chevy dealer charged me $3,500 to replace them. Internet sources state that this is a common problem with this car. I complained to Chevy corporate and they refunded $1,000. I do not feel this was a fair settlement due to the fact that it is a common problem.
Power steering went out while driving making it impossible to steer.
This happened back in May and the dealership couldn’t find anything wrong and it happened again today. I am driving and the car will shut off. A message pops up saying shift to neutral and press start again. It’s very dangerous and frustrating.
The contact owns a 2020 Chevrolet Blazer. The contact stated that while starting the vehicle, the brake pedal became inoperable. There was no warning light illuminated. The contact stated that excessive force was needed to depress the brake pedal to engage the START/STOP function to start the vehicle. The dealer was not contacted. The manufacturer was made aware of the failure by telephone.
The contact owns a 2020 Chevrolet Blazer. The contact stated that while operating the vehicle, the check engine warning light intermittently illuminated, and the vehicle hesitated while accelerating. The vehicle was taken to the local dealer to be diagnosed, and the contact was informed that the catalytic converter needed to be replaced. The vehicle was not yet repaired. Additionally, while operating the vehicle, the engine temperature rose to HOT. The vehicle was taken to the local dealer, and the thermostat was replaced. The manufacturer was notified of the failure. The failure mileage was 119,000.
The screen displayed shift to park. The car wouldn’t not recognize it was in park. Had to hit the shifter to get the car to recognize it was in park or it wouldn’t let you turn the car off. There was nothing other than the warning on the screen when we went to get gas and needed to turn the car off. It hasn’t been inspected by any of for this issue. I’m just afraid one day the car may roll if it doesn’t recognize it’s in park.
Compare the 2020 Chevrolet Blazer
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Other model years
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Questions about the 2020 Chevrolet Blazer
Is the 2020 Chevrolet Blazer reliable?
Owners have filed 224 complaints about the 2020 Chevrolet Blazer, 4.1 times a typical Blazer model year. It is one of the years we flag to avoid.
What is the 2020 Chevrolet Blazer year score?
The 2020 Chevrolet Blazer scores 23 out of 100 (poor). The score compares it with the other model years of the Chevrolet Blazer: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2020 Chevrolet Blazer?
Electrical system, with 78 complaints, typically around 38,000 miles. Next is transmission (75).
How many recalls does the 2020 Chevrolet Blazer have?
3 recalls, covering tires, power train and air bags.
What year does the Chevrolet Blazer have the most electrical problems?
The Chevrolet Blazer model years with the most electrical complaints are 1997 (90 complaints), 2020 (78 complaints) and 1998 (71 complaints).
What gas mileage does the 2020 Chevrolet Blazer get?
Official estimates for the 2020 Chevrolet Blazer range from 21 to 24 mpg combined. The most efficient version (2.0L 4-cyl, FWD) gets 21 city and 28 highway.
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