Used 2018 GMC Sierra 1500 for Sale nearModesto, CA

Compare 2018 GMC Sierra 1500 Trims

The 2018 GMC Sierra 1500 offers a range of trims from budget-friendly options to fully loaded models, all featuring a capable V6 engine.

• Starting at $16,733
• Best MPG/MPGe: 18 city / 24 hwy
• Most Popular: SLE

Trim Overview

Prices updated weekly from CarGurus listings.

Quick Compare Table

Listing prices sourced from CarGurus — updated weekly. OEM specs from manufacturer data.

Missing data displayed as "—".

Trim Deep Dives

Base — "Who It's For"

The Base is the pick for shoppers who want a reliable truck without paying for extra features. It's the most budget-friendly option in the lineup.

• Avg. market price: $16,733 (updated weekly)
• MPG/MPGe: 18 city / 24 hwy
• Inventory: 617 listings
• View Base listings

SLE — "Who It's For"

The SLE is the pick for shoppers who want a well-equipped truck without stepping up to the highest trim. It's also the most popular trim in the lineup by a wide margin.

• Avg. market price: $25,896 (updated weekly)
• MPG/MPGe: 18 city / 24 hwy
• Inventory: 2,448 listings — widest selection in the lineup
• View SLE listings

Trim Recommendations

Most Popular — SLE

With 2,448 active listings, the SLE is the clear volume leader in the lineup.

Browse SLE listings

Best Budget Option — Base

At $16,733 avg market price — below the lineup median of $21,314 — it's the most accessible entry point.

Browse Base listings

These recommendations are based on CarGurus' proprietary market data from September 24, 2026, CarGurus experts' opinions, and generative AI.

How much does the 2018 GMC Sierra 1500 cost?

Prices have softened 8.16% compared to this time last year, making it a favorable time to shop this model year.

There are 3,801 listings available, which suggests you have a healthy amount of inventory to compare.

Is the 2018 GMC Sierra 1500 a good car?

Generally — the 2018 GMC Sierra 1500 earns a 4.44/5 user rating and an 8.17/10 expert rating. The model scores 9/10 across Form and function and Safety.

Owners consistently praise its smooth ride, luxurious feel, excellent features, power, fuel efficiency, and comfortable interior. That lines up well with its role as a full-size pickup that can handle daily driving as well as work duties, especially if you want a truck that feels more polished than purely utilitarian.

With 29.8% of listings marked as good or great deals, the market still offers some room to shop selectively.

Is the 2018 GMC Sierra 1500 reliable?

Owners rate it 4.44/5, a solid signal of long-term satisfaction.

The owner feedback points to a truck that many people find dependable in everyday use, with repeated praise for its smooth ride, comfortable interior, and strong overall appeal. The expert evaluation also describes it as a truck with outstanding capability and a broad feature set, which supports the idea that it can serve well over the long haul.

There are still some ownership risks to keep in mind, especially because some owners mentioned engine performance and transmission concerns, so a careful pre-purchase inspection matters.

What should I look for when buying a used 2018 GMC Sierra 1500?

At 67.9% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.

You should start with a vehicle history report and confirm whether any prior damage was repaired properly. After that, prioritize a thorough inspection of the body, frame, and mechanical condition so you can separate clean, well-kept trucks from ones with hidden issues.

Key things to evaluate:

• Trim level: The Base truck comes with Bluetooth hands-free connectivity, a 6-speaker stereo, power locks, a power tailgate, a tire pressure monitoring system, and a 7-inch touchscreen, while the SLE adds satellite radio, a Wi-Fi hotspot, and an 8-inch screen. The SLT adds leather seating, heated front seats, dual-zone climate control, and standard 5.3-liter V8 power, while the Denali adds heated and ventilated front seats, a heated steering wheel, navigation, wireless charging, and unique Denali headrest embroidery.
• Powertrain: Four engines are available, starting with a 4.3-liter V6 with 285 horsepower and 305 pound-feet of torque, followed by a 5.3-liter V8 with 355 horsepower and 383 pound-feet, a mild-hybrid eAssist version of that V8, and a 6.2-liter V8 with 420 horsepower and 460 pound-feet. The 6.2-liter V8 uses an 8-speed automatic, while the V6 and 5.3-liter V8 use a 6-speed automatic.
• Safety package: The Enhanced Driver Alert Package is available on the SLE and SLT and standard on the Denali. It includes forward-collision alert, automatic high-beam control, lane-departure warning, front and rear parking sensors, and the Safety Alert seat. The package is not standard on the lower trims.
• Infotainment: The base truck gets a 7-inch touchscreen with GMC’s IntelliLink system, while all other trims but the Base get an 8-inch touchscreen. IntelliLink includes Apple CarPlay and Android Auto, and the system is described as easy to use.
• Fuel efficiency: The most efficient setups are the 4.3-liter V6 and the 5.3-liter V8 with eAssist, both rated at 18 mpg city, 24 highway, and 20 combined. The conventional 5.3-liter V8 with rear-wheel drive returns 16 mpg city, 23 highway, and 19 combined, while the 6.2-liter V8 test model returns 15 mpg city, 20 highway, and 17 combined.

Which 2018 GMC Sierra 1500 trim should I buy?

The 2018 GMC Sierra 1500 is offered in 4 trim levels: Sierra 1500, SLE, SLT, and Denali.

Here's the short version:

• Sierra 1500: This is the value-focused starting point, and it already gives you Bluetooth, a 6-speaker stereo, power locks, a power tailgate, a tire pressure monitoring system, and a 7-inch IntelliLink touchscreen. If you want the lowest entry price and can live without the extra comfort and convenience features, this is the trim to start with.
• SLE: This trim adds satellite radio, a Wi-Fi hotspot, and the larger 8-inch touchscreen, while also opening up more option packages. It is the best-value choice for many shoppers because it adds meaningful everyday convenience without jumping too far up the price ladder.
• SLT: This is the sweet spot if you want a more upscale cabin, since it adds leather seating, heated front seats, dual-zone climate control, and standard 5.3-liter V8 power. It also can be equipped with a locking rear differential and a Bose premium stereo.
• Denali: This is the luxury pick, with heated and ventilated front seats, a heated steering wheel, navigation, wireless charging, and the 7-speaker Bose stereo. It also comes standard with the Enhanced Driver Alert Package, so it is the trim to choose if you want the most comfort and the most safety content.

The safety package is available on the SLE and SLT and standard on the Denali.

Is now a good time to buy a used 2018 GMC Sierra 1500?

This looks like a moderate, selective buyer’s market, so you can shop carefully and still find worthwhile listings.

• Deal availability: 29.8% of listings are priced as good or great deals.
• Inventory: There are 3,801 listings available.
• Price trend: Prices have softened 8.16% compared with last year.
• Clean inventory: 67.9% of listings are accident-free.

If you find a listing below $26,050, that's toward the low end of the year-round range and worth acting on quickly.

What is the 2018 GMC Sierra 1500's resale value?

The current average of $26,050 sits slightly below last year's $28,365.

That softer pricing can help you buy more truck for the money now, but it also means future resale gains may be more limited if the market stays soft. If you plan to sell later, the biggest advantage is buying at a reasonable entry point so you have less depreciation to absorb.

Vehicles with solid owner satisfaction ratings, like this model year's 4.44/5, tend to retain buyer demand, which supports resale value over time.

Is the 2018 GMC Sierra 1500 safe?

It earns five-star ratings from NHTSA.

It earns a 9/10 safety score from our experts.

The Sierra 1500 comes standard with a reversing camera with dynamic guidelines, six airbags, StabiliTrak stability control, and the LATCH child-seat anchoring system. It also adds Easy Fill Alert to the tire pressure monitoring system for 2018, which helps you know when each tire is properly filled.

The Enhanced Driver Alert Package adds forward-collision alert, automatic high-beam control, lane-departure warning, front and rear parking sensors, and the Safety Alert seat. It is available on the SLE and SLT and standard on the Denali, so lower trims miss out unless you add the package.

Should I buy a 2018 GMC Sierra 1500 or consider a different year?

If you're weighing the 2018 against nearby model years, here's how to think about it:

Choose the 2018 if:

• 29.8% of listings are priced as good or great deals.
• At 67.9% accident-free, a meaningful share of listings has prior incidents — history verification is especially important.
• Price trend: Prices have softened 8.16% compared with last year.
• Owners rate it 4.44/5 — a solid satisfaction signal.
• It adds standard reversing camera and infotainment equipment, making the cabin feel more modern.

Consider the 2019 if:

• At $31,151, the 2019 costs more than the current year's $26,050 average.
• It is a completely redesigned pickup with a more thoroughly updated feel.

The bottom line: If you want the better value, the 2018 is the smarter buy because it combines a lower average price with strong owner satisfaction and useful standard equipment. If you want the newer redesign and are willing to pay more, the 2019 is the better path; otherwise, the 2018 gives you the more budget-friendly route without giving up the core strengths that make the Sierra appealing.

These recommendations are based on CarGurus' proprietary market data from September 22, 2026, CarGurus experts' opinions, and generative AI.