Electrical System: 'Shift to Park' Fault

A prevalent electrical issue where the vehicle incorrectly displays or fails to recognize that it is in Park, preventing shutdown or causing other electronic glitches. This is a recurring problem reported across various mileages. Estimated repair cost: $200 - $600.

Engine: Thermostat Failure

Recurring thermostat failures leading to engine overheating and, in some cases, reduced steering assist. This issue poses a direct safety risk due to potential loss of steering control. Estimated repair cost: $400 - $800.

Electrical System: Instrument Panel Issues

Complaints include blank instrument clusters, malfunctioning gauges, and other electronic failures within the driver information display. These can range from minor annoyances to significant distractions. Estimated repair cost: $300 - $800.

CARFOCALvehicle research

2020 Chevrolet Blazer Maintenance guide

Name: Maintenance dataset for 2020 Chevrolet Blazer
Creator: Carfocal

v1.0Updated May 30, 2026Ethan Miller4 Sources Analyzed8 Critical Recalls

MAINTENANCE SUMMARY

The 2020 Chevrolet Blazer, with a 'Below Average' reliability verdict, demands vigilant maintenance due to significant concerns in its powertrain, electrical system, and engine. Owners should prioritize addressing the frequent 'Shift to Park' electrical faults and potential transmission issues, which can occur at very low mileage.

View Critical Issue: Powertrain: Transmission Issues

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Reliability Score

Est. Annual Maintenance Cost

$500 - $1,000

TSBs & Recalls

104 TSBs | 11 Recalls

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Key Takeaways

The 2020 Chevrolet Blazer has a 'Below Average' reliability verdict.
Powertrain and electrical system issues are the most frequently reported problems.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance