2020 Chevrolet Silverado 3500HD Check Engine Light

Certified technicians, only the experts.
Frequently Asked Questions

Frequently Asked Questions

What does it mean when the check engine light comes on in a 2020 Chevrolet Silverado 3500HD?

  • It signals that the vehicle’s engine, emission system, or related sensors detected an issue — from a loose gas cap to a failing catalytic converter. Our certified technicians at Herb Chambers Chevrolet in Massachusetts diagnose the exact cause with OEM-level tools.
  • Choosing our dealership often costs less than independent shops because we combine transparent pricing, factory diagnostics and longer-lasting OEM repairs that save you money over time.
  • Repairs covered under any warranty must be completed at a certified dealership to preserve coverage; our team will explain warranty options and available discounts.
  • We offer service financing so you can get service now and pay later; when you’re ready you can schedule service or check current service specials.

How long does a check engine light service take?

  • Typical diagnostics for a 2020 Chevrolet Silverado 3500HD are completed in one to two hours; actual repair time varies by the issue identified. Herb Chambers Chevrolet prioritizes fast turnarounds without sacrificing accuracy.
  • We provide a clear estimate up front and explain immediate and long-term savings of repairing now — preventing more costly damage down the road.
  • Our service lanes use OEM parts, manufacturer tools and certified technicians to ensure a reliable repair that supports the truck’s longevity and towing performance.
  • To arrange an appointment that fits your schedule, schedule service online and review available service specials.

How much does a check engine light diagnostic cost for a 2020 Chevrolet Silverado 3500HD?

  • Diagnostic fees vary depending on complexity; Herb Chambers Chevrolet offers competitive, transparent pricing and often costs less than independent shops while providing factory training and warranty-backed repairs.
  • Investing in dealer diagnostics yields immediate savings by identifying the true issue quickly and long-term savings by using OEM parts that reduce repeat visits and protect resale value.
  • If a covered repair is needed, warranty work must be performed at a certified dealership to maintain coverage — we’ll walk you through what’s covered and what isn’t.
  • We also provide service financing so you can handle urgent repairs now and pay over time; check current offers and service specials, or schedule service today.

What is the most common reason for check engine light on a 2020 Chevrolet Silverado 3500HD?

  • Common causes include loose or damaged gas caps, oxygen sensor failures, catalytic converter issues, or misfires — each with different implications for performance and emissions.
  • Addressing the problem early at Herb Chambers Chevrolet reduces fuel waste, preserves towing capability and prevents more costly engine or emissions repairs in the future.
  • We use manufacturer-grade scanners to read precise codes and provide a clear estimate and repair timeline so you understand immediate and long-term benefits.
  • To protect your vehicle and warranty, let our certified team review the issue — schedule service or explore our service specials.

What is the first thing to check when the check engine light comes on?

  • Start by checking the gas cap for tightness and visible damage — it’s a simple fix that often resolves the light. If the light persists, professional diagnostics are the next step.
  • Bringing your 2020 Chevrolet Silverado 3500HD to Herb Chambers Chevrolet ensures the problem is correctly identified using OEM tools, preserving warranty and vehicle longevity.
  • Our technicians explain immediate repair needs, estimated costs and long-term value so you can make informed decisions that protect your truck’s performance and resale value.
  • We offer service financing, online booking and regular service specials; schedule service when you’re ready.

Check Engine Light Flashing

A flashing check engine light on a 2020 Chevrolet Silverado 3500HD is an urgent warning that the engine is misfiring or running in a condition that could cause immediate damage. In Massachusetts, Herb Chambers Chevrolet prioritizes safety and reliability — our factory-trained technicians will assess misfire conditions, ignition or fuel system faults, and any related catalytic converter risk. Ignoring a flashing light can lead to severe engine damage, reduced towing capacity and higher long-term repair bills. Our approach is to diagnose quickly with manufacturer-grade scan tools, explain the problem in plain language, and provide a written estimate before any repair. We emphasize OEM parts and certified repairs to keep your truck performing at its rated towing capacity and to protect warranty coverage. Watch for promotions and service incentives; you can review current service specials or schedule service online to get prompt attention and minimize downtime.

2020 Chevrolet Silverado 3500HD Check Engine Light Reset

Resetting the check engine light on a 2020 Chevrolet Silverado 3500HD is sometimes a temporary fix but not a solution. At Herb Chambers Chevrolet we explain why a reset should follow a full diagnostic: clearing codes without repairing the underlying issue can mask problems that later cause costly failures. Our technicians use OEM diagnostic procedures and genuine parts, ensuring transparency and long-term value. Dealer-performed resets also preserve warranty integrity — any repairs covered must be completed at a certified dealership to remain valid. We offer clear documentation of the work performed, and we’ll discuss available discounts, loyalty benefits and service financing so you can address repairs now and pay later. For convenience, you can view our current service specials and schedule service online. Choosing dealer service ensures accurate diagnostics, correct repairs, and an honest assessment of whether a reset is appropriate for your truck’s health.

2020 Chevrolet Silverado 3500HD Check Engine Light Codes

When a code appears for a 2020 Chevrolet Silverado 3500HD, common entries include P0300-series misfires, P0420 catalytic efficiency alerts, P0171 fuel trim lean conditions, and oxygen sensor codes. In our Herb Chambers Chevrolet service center in Massachusetts we map each code to likely causes and costs so you can make informed choices. For example, misfires left unchecked can damage the catalytic converter — a much more expensive repair — while an oxygen sensor replacement restores fuel economy and emissions compliance. We outline immediate repair costs and the long-term savings from fixing problems now: better MPG, preserved towing capacity, and avoided cascade failures. Our technicians are Chevrolet-certified, we use OEM parts, and we back work with dealer warranties. For one-stop convenience and expert care, check available service specials and schedule service online at Herb Chambers Chevrolet.