AI Damage2020 Chevrolet Blazer: common problems
Owners of the 2020 Chevrolet Blazer filed 224 complaints with NHTSA, most often about electrical system and powertrain. The maker issued 819 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 224
- involving a crash
- 5
- Technical service bulletins (TSB)
- 819
What fails most often
- 1 Electrical system 35% of all complaints
- 2 Powertrain 33% of all complaints
- 3 Engine 32% of all complaints
- 4 Steering 19% of all complaints
- 5 Service brakes 5% of all complaints
- 6 Lane departure 2% of all complaints
- 7 Suspension 2% of all complaints
- 8 Fuel/propulsion system 2% of all complaints
- Electrical system: 78 complaints (35% of all); manufacturer bulletins for this component: 203.
- Powertrain: 75 complaints (33% of all); manufacturer bulletins for this component: 93.
- Engine: 71 complaints (32% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 91.
- Steering: 43 complaints (19% of all); manufacturer bulletins for this component: 16.
- Service brakes: 11 complaints (5% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 29.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 2 L · petrol · turbo · 4 cyl
- 2.5 L · petrol · 4 cyl
- 3.6 L · petrol · 6 cylnamed in 7 complaints
- automatic, 9-speed
Drive: FWD, AWD
Symptoms owners describe
How many of the 224 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 78 | 0 | 203 |
| Powertrain | 75 | 0 | 93 |
| Engine | 71 | 1 | 91 |
| Steering | 43 | 0 | 16 |
| Service brakes | 11 | 1 | 29 |
| Lane departure | 5 | 0 | 4 |
| Suspension | 4 | 1 | 20 |
| Fuel/propulsion system | 4 | 1 | 5 |
| Vehicle speed control | 4 | 0 | 4 |
| Engine and cooling | 3 | 0 | 127 |
| Wheels | 3 | 1 | 40 |
| Tires | 3 | 0 | 21 |
| Forward collision avoidance | 3 | 0 | 10 |
| Air bags | 3 | 2 | 6 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
The air bags did not deploy. The contact received neck injuries, spinal injuries, headaches, consistent ringing of the ears, shoulder injuries, and hip injuries. Medical attention was needed. A police report was filed.
Got rear ended, the front right passenger seat bent backwards and torqued right.
I was driving about 35mph going straight when my chevy blazer acted as if it 'hit a brick wall' and came to a complete stop. I got out and noticed my right, front wheel was completely smashed into my car. Something had come loose internally and locked up my wheel.
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 [dealer] that I have an engine cooling system malfunction and to service now. It's showing a P0128 code when I had it checked.
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.
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.
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 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.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 294 of 2,102 model years in the NHTSA data (top 14% most complained about).
On average one model year of the Blazer has 92 complaints (8 years in the data). This year has 224, above average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it
- This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance
- PI to help diagnose A/C concern
- This preliminary information communicates information about how to determine if a wheel and tires size…
- This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a…
This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.
- This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic…
This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC'ss
- This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase…
This Preliminary information communicates the potential for condensation to freeze up inside the Crankcase Pressure Sensor causing dtc P04FB to set.
- This PI advised dealer technicians of possible causes of diesel fuel contamination in gasoline powered…
This PI advised dealer technicians of possible causes of diesel fuel contamination in gasoline powered vehicles and advises of warranty direction.
- This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic…
- This service bulletin provides information on Tire Sidewall Irregularities
- This service bulletin provides information on replacing the intake manifold when the engine is replaced…
This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
- This Preliminary Information communication provides information to the technician about vehicles that have…
This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer’s vehicles that exhibit vibration conditions…
NHTSA lists 819 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2020 Chevrolet Blazer?
Owner complaints to NHTSA most often mention: electrical system, powertrain, engine. Total complaints: 224. The most frequent symptoms in complaint texts: warning lights, check engine (26%), A/C or heater (20%), overheating, coolant loss (6%).
How many service bulletins (TSB) were issued for the 2020 Chevrolet Blazer?
NHTSA lists 819 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2020 Chevrolet Blazer from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2020 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.