2020 Chevrolet Blazer Check Engine Light
Certified technicians, only the experts. Frequently Asked QuestionsFrequently Asked Questions
What does it mean when the check engine light comes on in a 2020 Chevrolet Blazer?
- It signals that a sensor or system has logged an error — from emissions and fuel trim to ignition components. Our certified technicians at Herb Chambers Chevrolet in MA use factory-grade scanners to identify the exact code and cause.
- We explain repair options clearly and show how timely diagnostics often saves money by preventing larger repairs and improving fuel economy.
- Warranted repairs must be completed at a certified dealership to preserve coverage; our technicians are GM-trained and we use OEM parts for reliable, long-lasting fixes.
- We also offer service financing so you can get the work started today and pay over time. To book, please schedule service online.
How long does a check engine light service take?
- Most diagnostics take 30–90 minutes for a full scan, code interpretation, and basic testing at Herb Chambers Chevrolet. Complex repairs vary by cause; we provide an estimated timeline before work begins.
- Our express lanes, OEM parts inventory, and certified techs keep turnaround fast and dependable, often beating independent shops in total value and speed.
- Ask about current service specials and financing options to reduce immediate costs and maximize long-term savings.
- To get started now, schedule appointment with our service team in MA.
How much does a check engine light diagnostic cost for a 2020 Chevrolet Blazer?
- Diagnostic pricing varies by region and complexity. At Herb Chambers Chevrolet we often cost less than independent shops while delivering factory-level service, certified technicians, and OEM testing equipment — delivering immediate and long-term savings.
- If additional repairs are required, we provide clear estimates and show how quality parts and correct repairs reduce repeat visits and higher future costs.
- Ask about service financing to manage payments and check our service specials for bundled savings.
What is the most common reason for check engine light on a 2020 Chevrolet Blazer?
- Common causes include loose or failing gas caps, oxygen sensors, ignition coils, or catalytic converter issues. Our diagnostics pinpoint the exact component so we only recommend necessary repairs.
- Fixing root causes quickly helps preserve fuel economy and engine life — and often costs less at Herb Chambers Chevrolet because we combine efficient diagnostics with OEM parts and certified labor.
- Remember: warranty-covered issues must be repaired at a certified dealership to retain coverage.
What is the first thing to check when the check engine light comes on?
- Check the gas cap for tightness — it’s a simple fix that can clear the code. If the light persists or flashes, stop driving and let our team evaluate the 2020 Chevrolet Blazer immediately.
- Flashing lights often indicate an active misfire; prompt dealer diagnostics prevent catalytic converter damage and save money long-term.
- Use our online tools to schedule service and review service specials before you come in.
Check Engine Light Flashing
The check engine light flashing in a 2020 Chevrolet Blazer is a sign of an acute issue — most commonly an engine misfire — that can lead to severe damage if ignored. A flashing condition usually means unburned fuel is entering the exhaust stream, which can overheat and damage the catalytic converter, increasing repair costs dramatically. At Herb Chambers Chevrolet in MA we treat flashing lights as urgent: our technicians perform fast, prioritized diagnostics with GM factory tools to find the root cause, whether that’s ignition coils, spark plugs, fuel injectors, or wiring faults. Choosing our dealership for immediate evaluation reduces the risk of downstream failures and often saves money over time by avoiding larger component replacements. We offer transparent estimates, OEM parts, and service financing so customers can address urgent repairs immediately and pay over time. Check our current service specials for added value, and schedule service online to reserve a priority appointment. Our team will keep you informed through every step and help protect the longevity and performance of your Blazer.
2020 Chevrolet Blazer Check Engine Light Reset
Resetting the check engine light on a 2020 Chevrolet Blazer is a simple action, but a reset without resolving the underlying fault can mask symptoms and risk future failures. At Herb Chambers Chevrolet we emphasize correct repairs before resetting codes: our factory-grade scanners document stored and pending codes, freeze-frame data, and readiness monitors so technicians can diagnose causes accurately. If a repair or maintenance task resolves the issue, we clear codes and verify the system returns to normal before returning the vehicle. Choosing dealership service over quick resets at an independent shop ensures OEM parts, verified repairs, and warranty protection — any warranty-covered repairs must be performed at a certified dealership to remain valid. We also provide itemized repair explanations, service financing to make repairs affordable, and frequently updated service specials to reduce cost. For dependable service and a documented reset that protects your vehicle’s health, schedule service with our certified team in MA today.
2020 Chevrolet Blazer Check Engine Light Codes
Common check engine light codes for the 2020 Chevrolet Blazer include P0420 (catalyst system efficiency), P0300 (random/multiple misfires), P0171/P0174 (fuel trim/system too lean), and P0135/P0136 (oxygen sensor/heater circuit). Each code points to a different repair path and varying costs if left unattended: misfires can damage the catalytic converter, turning a spark plug or coil replacement into a much larger bill; a failing oxygen sensor can reduce fuel economy and increase emissions; and catalyst issues almost always carry higher replacement costs. At Herb Chambers Chevrolet in MA we provide clear, local pricing estimates and explain how prompt repairs reduce immediate and long-term expenses. Our certified technicians use OEM parts, factory-level diagnostics, and transparent communication to minimize unnecessary work and maximize vehicle longevity. We often deliver better overall value than independent shops because of our parts sourcing, trained staff, and efficient service processes. Review current service specials and schedule appointment online to get a prompt, accurate diagnosis for your 2020 Chevrolet Blazer.