Frequently Asked Questions

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

• Verify the fuel cap is tightened — a loose or damaged cap is a common trigger on the 2025 GMC Yukon.
• Scan the instrument cluster for additional warnings or messages that narrow the issue.
• Check basic fluids and visible connections under the hood, but avoid extensive DIY repairs if you lack experience.
• If the light is flashing, stop driving and contact us — a flashing light often signals an active engine misfire that can damage the catalytic converter.
• Schedule a certified diagnostic at Coggin Buick/GMC of Orange Park so factory-trained technicians can identify causes and protect any warranty coverage.

How long does a check engine light service take?

• Most diagnostic checks on a 2025 GMC Yukon are completed within 30–90 minutes, depending on code complexity and inspection needs.
• Simple resets or minor fixes such as tightening the gas cap or clearing a stored code can be completed the same day.
• Repairs requiring parts or in-depth diagnostics may require additional time; our service advisors provide clear estimates and timelines up front.
• Choosing Coggin Buick/GMC of Orange Park often reduces overall downtime — our parts inventory and factory-trained technicians speed accurate repairs.
• Remember: warranty-covered repairs must be performed at a certified dealership to preserve coverage and ensure long-term savings.

What does it mean when the check engine light comes on in a 2025 GMC Yukon?

• It signals the vehicle’s onboard diagnostics (OBD-II) detected an issue — severity ranges from minor emissions faults to engine misfires.
• Codes stored in the system identify affected subsystems (fuel, ignition, emissions, sensors) and guide repair priorities.
• At Coggin Buick/GMC of Orange Park we read codes with OEM-grade tools and interpret results based on manufacturer data to avoid unnecessary parts replacement.
• Timely dealership diagnostics protect factory warranties and often deliver lower total ownership costs compared with independent shops.
• If codes indicate safety risks or a flashing light, schedule immediate service to prevent further damage and higher future expenses.

How much does a check engine light diagnostic cost for a 2025 GMC Yukon?

• Diagnostic fees vary, but Coggin Buick/GMC of Orange Park provides transparent pricing and often costs less than independent shops when you factor service quality and accurate repairs.
• Our diagnostics include OEM-level scanning, technician time, and a clear estimate for required repairs to avoid surprise charges.
• Choosing the dealership delivers immediate savings through precise fixes, and long-term savings by preventing repeat visits and protecting warranty coverage.
• Any repairs covered under warranty must be completed at a certified dealership to preserve benefits — we handle those claims directly for you.
• Contact our service department or visit our specials page to learn current diagnostic offers and appointment availability.

What is the most common reason for check engine light on a 2025 GMC Yukon?

• Loose or faulty gas cap is among the simplest and most frequent causes, often triggering an emissions-related code.
• Oxygen sensor or catalytic converter issues appear commonly if the vehicle runs rich or exhibits decreased fuel economy.
• Spark plug or ignition coil faults can cause misfires, sometimes leading to a flashing check engine light requiring immediate attention.
• EVAP system leaks and mass air flow sensor faults are other regular triggers; precise scanning at the dealership pinpoints the source.
• Addressing these items promptly at Coggin Buick/GMC of Orange Park reduces long-term repair costs and helps maintain factory warranty protection.