Frequently Asked Questions

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

• Check for a loose or missing gas cap — it’s a common cause on a 2025 GMC Terrain and can throw an EVAP code.
• Look for obvious signs: unusual noises, loss of power, smoke, or fluid leaks before driving further.
• If the vehicle is safe, note any changes in performance and the light’s behavior (steady vs. flashing).
• Bring the Terrain to Coggin Buick/GMC of Orange Park for a proper diagnostic — dealership service can uncover underlying issues and protect warranty coverage.

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

• A steady light usually indicates a non-emergency emission or sensor issue (oxygen sensor, EVAP leak, etc.).
• A flashing light signals a severe condition such as a misfire that can damage the catalytic converter.
• Diagnostics at our dealership identify the exact trouble codes and recommended repairs; many issues are covered under warranty when serviced at a certified dealership.
• Using our factory-trained technicians often delivers immediate and long-term savings compared with independent shops while maintaining OEM parts and service standards.

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

• Common causes include faulty oxygen sensors, loose gas caps, EVAP system leaks, or ignition misfires.
• Many of these begin as small issues that reduce fuel economy and, if ignored, can lead to costly repairs.
• Our technicians use OEM diagnostics to pinpoint causes quickly, minimizing downtime and long-term expenses.
• Remember: warranty-covered repairs must be completed at a certified dealership to preserve protection and save you money over time.

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

• Diagnostic fees at Coggin Buick/GMC of Orange Park typically start around a competitive, transparent flat rate for code reading and inspection.
• If repairs are needed, we often cost less than independent shops when factoring in accurate diagnosis, OEM parts, and factory-trained labor.
• Many warranty or recall conditions can waive diagnostic fees — warranty repairs must be performed at a certified dealership to apply.
• Choosing dealership service provides immediate savings through correct repairs and long-term savings by preventing repeated or improper fixes common with less specialized shops.

How long does a check engine light service take?

• Simple diagnostics and code reading usually take less than an hour; many common fixes (gas cap, sensor replacement) can be completed the same day.
• More complex problems requiring parts or in-depth diagnosis may take several hours to a full day; our service advisors provide realistic timelines at check-in.
• We prioritize efficiency with factory tools and trained technicians to reduce downtime and deliver dependable repairs.
• Warranty-covered repairs must be done at a certified dealership to remain valid, ensuring long-term protection and cost savings.