2020 Ram 3500 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 Ram 3500?

  • It indicates the vehicle's onboard diagnostics detected an issue — anything from a loose gas cap to emission, fuel, ignition, or sensor faults that affect performance and economy.
  • At Larry H. Miller Chrysler Dodge Ram FIAT Denver, our certified technicians use OEM-grade scanners to pinpoint codes fast, often saving you immediate and long-term repair costs versus guesswork repairs.
  • We provide clear estimates, genuine parts and warranty-backed repairs; note that warranty-covered repairs must be completed at a certified dealership to remain valid.
  • If you want immediate attention, schedule service online or check current service specials to reduce out-of-pocket expense.
  • We offer service financing so you can get necessary repairs now and pay later, helping avoid higher costs from delayed diagnosis.

How long does a check engine light service take?

  • Typical diagnostics are completed in under an hour; the complete time depends on the repair required. Our shop prioritizes quick turnarounds without cutting quality.
  • Common fixes like sensor replacements or resets can be same-day; more involved repairs receive a clear timeline and cost estimate before work begins.
  • Choosing Larry H. Miller Chrysler Dodge Ram FIAT Denver often costs less than independent shops when factoring accuracy, OEM parts and long-term reliability — immediate savings through precise diagnostics and long-term savings via durable repairs.
  • To reserve a time that fits your schedule, please schedule appointment online; review our current service specials for available discounts.
  • We also provide loaner options and comfortable waiting areas when available, and repairs under warranty must be completed at certified dealerships to protect coverage.

How much does a check engine light diagnostic cost for a 2020 Ram 3500?

  • Diagnostic fees vary by the issue, but our upfront pricing and transparent estimates help you understand repair vs. replace decisions.
  • Larry H. Miller Chrysler Dodge Ram FIAT Denver often costs less than independent shops once you include precise diagnostics, OEM parts, and warranty protection — delivering both immediate and long-term savings.
  • If repairs are required and covered by warranty, those repairs must be performed at a certified dealership to maintain coverage.
  • Ask about our service specials and financing options so you can get the service now and pay later if needed.
  • To get a fast diagnostic and a clear estimate, schedule service online today.

What is the most common reason for check engine light on a 2020 Ram 3500?

  • The most frequent causes include oxygen sensor faults, catalytic converter issues, ignition problems, or loose/faulty gas caps — each can affect fuel economy and emissions.
  • Addressing these promptly at Larry H. Miller Chrysler Dodge Ram FIAT Denver prevents larger failures, lowers fuel costs, and preserves vehicle value over time.
  • Our certified technicians identify root causes, use OEM parts, and back work with warranties — repairs under warranty must be done at certified dealerships to remain valid.
  • We provide transparent estimates, and our service financing options make essential repairs affordable without delay.
  • Find savings via current service specials or schedule service to get inspected quickly.

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

  • First check the fuel cap is tight — a loose cap is a common, simple trigger that can be corrected immediately and may turn the light off after a few drive cycles.
  • If the light persists or flashes, avoid prolonged driving and bring your 2020 Ram 3500 to Larry H. Miller Chrysler Dodge Ram FIAT Denver for a thorough scan and expert diagnosis.
  • We emphasize accurate diagnostics with OEM tools, saving you money over time by preventing misdiagnosis and unnecessary parts replacement.
  • Schedule online to get prompt attention: schedule service, and check our service specials for ways to save.
  • Remember that warranty-covered repairs must be completed at a certified dealership to protect your coverage and vehicle longevity.

2020 Ram 3500 Check Engine Light Reset

Resetting the check engine light on a 2020 Ram 3500 can be as simple as correcting a loose gas cap, but a true reset should follow a complete diagnostic to ensure the underlying fault is fixed — otherwise the light will return and hidden issues may worsen. At Larry H. Miller Chrysler Dodge Ram FIAT Denver in Denver, CO, our certified technicians perform a full scan with OEM-level equipment to read trouble codes, verify repairs, and then clear the code securely. This guarantees transparency: you'll receive a detailed report of the detected fault, the recommended repair, and the estimated cost. We emphasize OEM parts for durability and to maintain warranty coverage; note that warranty repairs must be performed at certified dealerships to remain valid. Choosing dealership service often delivers immediate savings by avoiding repeated misdiagnoses and long-term savings through longer-lasting repairs and preserved vehicle value. Take advantage of our service financing options to get necessary work started now, and browse current service specials before you book. When you're ready, schedule service for a professional, warranty-conscious reset and peace of mind.

Check Engine Light Flashing

A flashing check engine light on your 2020 Ram 3500 signals a severe condition — often active misfires that can damage the catalytic converter or indicate critical ignition/fuel issues. When you see a flashing light, reduce speed, avoid heavy loads, and bring the truck to Larry H. Miller Chrysler Dodge Ram FIAT Denver immediately for prioritized diagnostics. Our technicians will perform a rapid scan to isolate codes and recommend the most reliable repair path using OEM parts and factory procedures; this approach minimizes vehicle downtime and reduces the risk of cascading damage that leads to far higher repair bills. We combine skill, quick turnarounds, and transparent pricing so you understand both immediate costs and long-term value; our financing options let you authorize essential repairs without delay. Check our current service specials for savings, and call or schedule appointment online now. Acting fast with certified service preserves performance, protects emissions systems, and keeps your 2020 Ram 3500 running reliably for years.

2020 Ram 3500 Check Engine Light Codes

Common check engine light codes for the 2020 Ram 3500 include O2 sensor faults (P0130–P0167), catalytic converter efficiency codes (P0420), misfire codes (P0300–P0308), and turbo or boost-related codes on forced-induction models — though the 6.4L naturally aspirated V8 in many 3500s produces its own typical code patterns related to ignition and fuel systems. Ignoring these codes can result in diminished fuel economy, escalated emissions failures, engine damage, and expensive downstream repairs such as catalytic converter replacement. At Larry H. Miller Chrysler Dodge Ram FIAT Denver, our team in Denver, CO explains each code in plain language, outlines the cost of ignoring the issue, and provides a clear estimate for repair using OEM parts and factory procedures. We focus on fast diagnostics, accurate repairs, and preserving warranty coverage — repairs under warranty must be carried out at a certified dealership to remain effective. You can protect resale value and avoid compounding damage by addressing codes early; explore available service specials and schedule service with our certified technicians for prompt, dependable care.