Frequently Asked Questions

How much does a check engine light diagnostic cost for a 2026 GMC HUMMER EV SUV?

• Typical diagnostic appointments at Coggin Buick/GMC of Orange Park start with a comprehensive scan and system check; fees are competitive and often lower than independent shops.
• Diagnostics allow us to pinpoint high-voltage battery, inverter, charger, or network faults quickly so you save on unnecessary parts and labor.
• Estimated diagnostic ranges: initial scan and inspection $100–$200; follow-up tests vary by issue — we provide transparent estimates before any repair.
• Warranty-covered repairs must be completed at a certified dealership to preserve coverage and ensure genuine GM parts and factory procedures.
• Choosing our dealership delivers immediate and long-term savings through accurate diagnostics, factory-trained technicians, and warranty protection.

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

• Check dashboard messages and alerts for guidance, then note whether the light is steady or flashing.
• For an EV, verify the charging connector and cable, charge level, and any charging station errors before driving further.
• Confirm any recent software updates or error notices from the vehicle app — some alerts can be resolved by technician-performed updates.
• If the light is flashing or the vehicle shows reduced power, stop driving and contact Coggin Buick/GMC for immediate assessment and towing if needed.
• Document symptoms and recent events (charging history, low range, warnings) to help our technicians diagnose faster and save you money.

What does it mean when the check engine light comes on in a 2026 GMC HUMMER EV SUV?

• A check engine or powertrain warning can range from minor sensor faults to serious high-voltage system issues that affect range and drivability.
• In an EV it often signals charger, inverter, battery management, thermal control, or communication network alerts that require a professional scan tool.
• Steady lights typically indicate non-critical faults; flashing lights suggest immediate attention to prevent further damage or safety risks.
• Cognizant, factory-trained technicians at our dealership use GM-specific diagnostics to identify root causes quickly, avoiding unnecessary replacements.
• Repair work covered under warranty must be performed at a certified dealership to protect your coverage and maximize long-term savings.

How long does a check engine light service take?

• Initial diagnostics and scans usually take 30–90 minutes depending on system checks and any required test drives.
• If the issue is a simple sensor or software update, resolution can often be completed the same day.
• Major repairs—battery module, inverter, or charging system work—may require parts ordering and can take from one to several days.
• We prioritize transparent timelines: you receive an upfront estimate and we work to minimize downtime while preserving warranty integrity.
• Using our dealership often reduces total repair time and cost through accurate diagnosis, priority access to GM parts, and factory procedures.