2018 GMC Sierra 1500 Extended Warranty
The 2018 GMC Sierra 1500 is now at typical current mileage of 105,000–135,000 miles. All factory coverage — including the 5-year/60,000-mile powertrain warranty — has fully expired, leaving owners with complete out-of-pocket exposure on major repairs. Athena Auto Protection shields 2018 GMC Sierra 1500 owners from costly surprise repairs on the components most likely to fail at this mileage.
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Model Years Produced
14,000
Avg. Annual Miles
$3,800
Avg. Major Repair Cost
Common 2018 GMC Sierra 1500 Repair Costs
These are the most frequently needed repairs for the 2018 GMC Sierra 1500 and what they typically cost without warranty coverage.
Without extended warranty coverage, 2018 GMC Sierra 1500 owners face an average major repair bill of $3,800. One of the costliest common failures — Transmission Rebuild / Replacement — runs $3,500–$6,500 at independent shops and dealerships. Source: Athena Auto Protection claims data and RepairPal industry estimates.
Recommended Plan for 2018 GMC Sierra 1500
Based on typical Sierra 1500 repair patterns and costs
The Sierra's AFM lifter failure is the most catastrophic and expensive engine issue, and the 8L90 transmission has known reliability concerns. Deluxe Coverage protects the engine internals (including lifters), transmission, A/C, fuel delivery, and 4WD drivetrain — the systems most likely to cause expensive repairs on a Sierra. This guidance applies directly to the 2018 GMC Sierra 1500 at its typical mileage today.
Benefits All Coverage Plans Include
Every Athena Auto Protection plan for your 2018 GMC Sierra 1500 comes with these benefits
$100 Deductible
Per repair visit — you pay $100 at the shop, we cover the rest directly.
Any Licensed Shop
Use any licensed repair facility — independent, chain, or dealership.
24/7 Roadside Assistance
Towing, flat tire, battery jump, lockout, and fuel delivery included.
Claims Processing
Claims are reviewed individually.
Direct Shop Payment
We pay the repair facility directly via corporate credit card. No reimbursement hassle.
Rental Car Benefits
Rental car reimbursement while your vehicle is being repaired at a covered facility.
2018 GMC Sierra 1500 Extended Warranty FAQ
Yes. The factory bumper-to-bumper warranty expired in 2021 and the powertrain warranty expired in 2023 for most 2018 GMC owners. All factory coverage has ended.
Transmission Rebuild / Replacement and AFM Lifter Failure (V8 models) are among the most frequently reported concerns on the 2018 GMC Sierra 1500. Transmission Rebuild / Replacement typically costs $3,500–$6,500 to repair, and AFM Lifter Failure (V8 models) runs $2,500–$5,000 at most shops.
The 2018 GMC Sierra 1500 can develop the same wear-related issues seen across the model line — most notably Transmission Rebuild / Replacement — as it climbs in mileage. Athena covers these repairs with a flat $100 deductible instead of a large out-of-pocket bill.
Yes. You can use any licensed repair facility, including a GMC dealership's service center. Athena pays the shop directly — you pay only the $100 deductible per repair visit.
Athena Auto Protection offers personalized coverage quotes. Your vehicle, mileage, coverage tier, and contract terms determine your quote. Call (833) 251-9786 for a personalized quote.
About the Article Author
Steven Telle
Chief Operating Officer
Steven oversees daily operations, claims processing, and the concierge support teams at Athena. He brings deep experience in warranty administration and service contract compliance, ensuring every customer interaction meets the highest standard of transparency and speed.
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