Frequently Asked Questions

How long does a check engine light service take?

• Initial diagnostic scan typically takes 30–60 minutes to read codes and capture live data.
• Basic fixes (software updates, sensor resets) are often same-day; more involved repairs can require several hours to a full day.
• If parts or high-voltage work are needed, we provide a clear time estimate and prioritize safety and accuracy.
• Choosing Coggin Buick/GMC of Orange Park often reduces overall downtime — our factory-trained technicians and parts access deliver faster, more reliable repairs and long-term savings compared with many independents.
• Remember: any warranty-covered repairs must be performed at a certified dealership to preserve coverage.

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

• Read the instrument cluster message immediately — the 2024 GMC Sierra EV will often display guidance or a severity indicator.
• Look for related alerts (battery, charging, inverter, thermal) and note recent events like charging interruptions or unusual noises.
• If the vehicle is drivable, reduce load and avoid high speed; if a severe warning appears, stop safely and contact the dealership.
• Do not clear codes at home — clearing may hide underlying faults and risk voiding warranty; have a certified technician diagnose and document the issue.
• Bring your Sierra EV to Coggin Buick/GMC of Orange Park for prompt, OEM-level inspection and accurate repair recommendations.

How much does a check engine light diagnostic cost for a 2024 GMC Sierra EV?

• Diagnostic fees typically range from about $99 to $199 depending on the depth of testing and any live-data captures required.
• At our dealership, diagnostics are efficient and often credited toward repairs when you choose us for the service, resulting in immediate savings.
• Factory-trained technicians use OEM tools and software to find accurate root causes — this reduces repeat visits and long-term expense compared with incomplete fixes.
• When repairs are covered by warranty, they must be completed at a certified dealership to maintain coverage — this can eliminate customer repair costs entirely.
• We provide transparent estimates so you understand both short-term diagnostic costs and longer-term savings by repairing correctly the first time.

What does it mean when the check engine light comes on in a 2024 GMC Sierra EV?

• For the Sierra EV, the light can indicate issues with the electric drivetrain, battery management system, inverter, onboard charger, or related sensors.
• It may also flag communication faults between modules, thermal management warnings, or auxiliary 12V system problems that affect vehicle electronics.
• Some alerts are informational, while others signal a performance limit or safety concern — the instrument messages will help indicate severity.
• Prompt dealership diagnosis ensures correct software updates or component repairs and preserves warranty eligibility for covered items.
• Bring your vehicle to Coggin Buick/GMC of Orange Park for expert evaluation, OEM parts, and service that minimizes long-term cost and risk.

What is the most common reason for check engine light on a 2024 GMC Sierra EV?

• Common causes include sensor or communication faults, 12V auxiliary battery problems, or software-related module errors.
• Charging interruptions and connector issues can also trigger warnings; these are often straightforward to diagnose but should not be ignored.
• Addressing these problems at a dealership often costs less overall — our technicians quickly identify root causes and prevent repeat failures.
• We emphasize immediate and long-term savings: correct OEM repairs and proper software calibration reduce future repair bills and protect resale value.
• Remember, warranty-covered repairs must be performed at a certified dealership to remain valid and to maximize your savings.