The most commonly reported problem for the 2020 Chevy Blazer is transmission-related shifting issues, with infotainment glitches as a frequent secondary concern.
What buyers and reviewers report most often
Below is a snapshot of the kinds of problems that drivers have flagged, based on consumer complaints, owner forums, and recall data up to 2026.
- Transmission shifting issues, including hesitation, slipping, and abrupt or delayed engagement
- Infotainment system glitches such as touchscreen freezes, reboots, Bluetooth connectivity drops, or audio dropouts
- Electrical/electronic faults like intermittent warning lights, battery drain, or accessory failures
- Engine performance concerns such as reduced power, rough idle, or inconsistent acceleration
These categories reflect the most commonly reported problem areas. Individual vehicles may vary, and many issues may be addressed under warranty or recall campaigns.
Transmission-related symptoms
Common signs linked to transmission issues include slow or hesitant acceleration, shuddering during shifts, and conflicts between gear selection and road speed. If these symptoms appear, a dealer inspection is usually recommended to check the transmission control module, valve body, and related sensors.
What to do if you own a 2020 Blazer and notice problems
Owners experiencing symptoms should take deliberate steps to diagnose and address potential failures, while keeping records for service and warranty purposes.
- Check for open recalls and service campaigns using NHTSA's recall lookup or GM's MyVehicle portal.
- Update software on the infotainment system and vehicle computer; install any GM-recommended flashes or updates.
- If you experience transmission symptoms, document when they occur (mileage, speed, load) and have a dealer diagnose the transmission and the control modules.
- Have the vehicle scanned for fault codes if the check engine light is on or if there are transmission fault codes; ask for any relevant service bulletins.
- Review your warranty coverage (basic vs. powertrain) and consider an extended warranty or maintenance plan if you are outside standard coverage.
Warranties typically cover basic 3 years/36,000 miles and powertrain 5 years/60,000 miles, with variations by region and option; check your contract for specifics. If a safety-related recall is involved, manufacturers typically perform free repairs.
Maintenance and proactive care
Proactive care can reduce risk and improve reliability in the Blazer’s electronic and drivetrain systems. The following steps are commonly advised by manufacturers and independent shops alike.
- Keep software up to date: infotainment updates and electronic control unit software can fix known glitches.
- Follow recommended service intervals: transmission fluid checks or changes as specified in the owner’s manual, and regular battery/system checks, especially in extreme climates.
- Monitor warning lights and message prompts: address any dashboard alerts promptly to prevent potential damage.
- Document symptoms and dealership visits: a clear service history helps with warranty claims and potential recalls.
Staying current with recalls and service campaigns, along with maintaining records, can help safeguard against common issues and maximize the vehicle’s reliability as it ages.
Warranty and recalls: what to know
As a 2020 model year, the Blazer’s typical coverage includes a basic warranty and powertrain warranty, along with any active safety recalls. The basic warranty generally covers 3 years/36,000 miles, while the powertrain warranty covers 5 years/60,000 miles. Regions and trim levels may differ, so verify with a Chevrolet dealer or GM’s official portal for precise terms and any active recall campaigns.
Summary
For the 2020 Chevy Blazer, the most frequently reported issues center on transmission behavior and infotainment/electrical systems. While many drivers will not experience major problems, awareness of these common trouble spots and proactive maintenance—plus timely recall checks and software updates—can help keep the Blazer performing reliably. If problems arise, acting early and documenting symptoms enhances your options for service coverage and repair.