2018 GMC Sierra 1500 alternator price snapshot
- Low
- $35
- Average
- $128
- High
- $268
Year-specific price guide
Used 2018 GMC Sierra 1500 Alternator prices
Year-specific used alternator pricing for the 2018 GMC Sierra 1500, built from real salvage yard and junkyard listings with condition grade and fitment detail.
SKWritten bySaurabh Kumar · Co-Founder & CTO
SK
Saurabh Kumar
Co-Founder & CTO, Part Price Guide
Built the pricing pipeline that collects and normalizes used OEM part listings from salvage yards and online marketplaces across the US.
ASReviewed byAmbika Sharma · Co-Founder & COO
Last updatedOct 20, 2026AS
Ambika Sharma
Co-Founder & COO, Part Price Guide
12 years of project management and technical operations experience. Reviews price guides for sample size, fitment accuracy, and data freshness.
Part overview
About the 2018 GMC Sierra 1500 alternator
A used 2018 GMC Sierra 1500 alternator costs between $35 and $268, with a median of $157 from 133 salvage yard listings.
What the alternator does, common failure signs, and prices across all vehicles: used alternator price guide →
Price summary
A used 2018 GMC Sierra 1500 alternator costs $35 to $268, with a median asking price of $157. Based on 133 priced salvage yard listings across the US, compatible across 2014–2020 (7 model years), updated Oct 20, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$162
Grade B (good)$113
Grade C (fair)$60
USD
Condition comparison
Price by part grade
Grade AClean / low wear$45–$24976 listings
Grade BStandard used$49–$26847 listings
Grade CVisible wear$60–$602 listings
Grade XUngraded$35–$1008 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $45–$249 | 76 | |
| Grade BStandard used | $49–$268 | 47 | |
| Grade CVisible wear | $60–$60 | 2 | |
| Grade XUngraded | $35–$100 | 8 |
Median by grade
Grade price comparison
Grade A$162
Grade B$113
Grade C$60
Ungraded$50
Median asking price by seller-reported condition grade · $35–$268 overall range
Replacement cost
What is the 2018 GMC Sierra 1500 alternator replacement cost?
- Used part
- $157
- 2018 GMC Sierra 1500 median asking price
- Labor
- $95–$375
- 1–2.5 hours at $95–$150/hr
- Estimated total
- $250–$530
- median used part + labor
Labor is a typical independent-shop range for alternator replacement, not a quote for your vehicle. The part price is the live median from the salvage-yard listings on this page. Full alternator replacement cost breakdown
Fitment matters
Price by trim & variant
Year-specific context
How does the 2018 GMC Sierra 1500 compare?
The 2018 guide is based on 150 observed listings, including 133 with posted prices. Its $157 median is 17% above the GMC Sierra 1500 guide's $134 median.
Among the 11 model years with current price data, 2018 ranks #9 from lowest to highest median.
Interchange data shows this part is also listed under model years 2014, 2015, 2016, 2017, 2019, 2020. Shopping across all 7 compatible years may surface better prices or condition grades.
Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.
Compare model years
What does a GMC Sierra 1500 alternator cost in other years?
2025298 listings$171$50 – $2582024299 listings$169$50 – $2682023250 listings$115$40 – $2932022350 listings$106$40 – $3112021300 listings$136$45 – $2802020350 listingsCompatible$90$40 – $3952019400 listingsCompatible$153$45 – $2802017199 listingsCompatible$157$35 – $2682016150 listingsCompatible$137$35 – $2492015100 listingsCompatible$85$40 – $310
Keep browsing this vehicle
What other GMC Sierra 1500 parts are priced?
01wide ±136%
AC Compressor
$150median
$40$447
02wide ±91%
ABS Module
$201median
$85$450
03wide ±242%
Air Bag
$240median
$40$1,200
04wide ±122%
Axle Shaft
$165median
$55$456
05wide ±149%
Blower Motor
$85median
$40$294
06wide ±120%
Brake Caliper
$75median
$35$215
07wide ±193%
Rear Bumper Assembly
$644median
$140$2,625
08wide ±132%
Front Bumper
$240median
$85$720
09wide ±170%
Rear Bumper
$500median
$97$1,795
10wide ±173%
Car Radio
$147median
$34$544
11wide ±293%
Center Console
$203median
$35$1,225
12wide ±72%
AC Condenser
$195median
$40$321
13wide ±99%
Control Arm
$145median
$40$327
14
Differential
Price data updating
15wide ±112%
Door Assembly
$716median
$180$1,785
16wide ±167%
Drive Shaft
$243median
$65$878
17wide ±138%
Engine
$4,175median
$1,250$12,735
18wide ±150%
Engine Computer
$137median
$30$440
19wide ±270%
Exhaust Manifold
$71median
$25$408
20wide ±88%
Fender
$504median
$160$1,050
21wide ±123%
Fog Light
$163median
$35$435
22wide ±185%
Front Seat
$247median
$60$975
23wide ±246%
Fuel Pump
$135median
$34$699
24wide ±108%
Fuel Tank
$195median
$55$478
25wide ±105%
Grille
$495median
$159$1,194
26wide ±69%
Headlight Assembly
$875median
$318$1,520
27wide ±155%
Heater Core
$116median
$40$400
28spread ±57%
Hood
$791median
$375$1,275
29wide ±152%
Ignition Switch
$99median
$25$325
30
Instrument Cluster
Price data updating
31wide ±232%
Intake Manifold
$120median
$34$591
32wide ±250%
Master Cylinder
$56median
$25$305
33wide ±190%
Side Mirror
$255median
$55$1,025
34wide ±153%
Power Steering Pump
$136median
$35$450
35wide ±76%
Quarter Panel
$636median
$216$1,185
36wide ±134%
Radiator
$200median
$60$595
37wide ±265%
Rear View Mirror
$100median
$20$550
38wide ±151%
Starter
$91median
$30$305
39wide ±112%
Steering Column
$201median
$50$500
40wide ±94%
Steering Rack
$614median
$217$1,367
41wide ±180%
Steering Wheel
$190median
$40$725
42wide ±129%
Strut
$155median
$50$450
43wide ±153%
Sunroof
$389median
$126$1,320
44wide ±125%
Tail Light
$335median
$60$900
45wide ±239%
Tailgate
$800median
$178$3,995
46wide ±227%
Throttle Body
$77median
$25$375
47spread ±40%
Torque Converter
$450median
$142$500
48wide ±235%
Transfer Case
$378median
$67$1,845
49wide ±75%
Transmission
$2,595median
$1,295$5,204
50wide ±214%
Transmission Control Module
$125median
$25$560
51wide ±138%
Turbocharger
$675median
$190$2,054
52wide ±171%
Water Pump
$85median
$25$315
53wide ±217%
Wheels
$275median
$55$1,250
54wide ±127%
Window Regulator
$150median
$30$410
Common questions
2018 GMC Sierra 1500 alternator FAQ
How much is a used 2018 GMC Sierra 1500 alternator?
Based on 133 priced salvage-yard listings, a used 2018 GMC Sierra 1500 alternator lists between $35 and $268, with a median asking price of $157.
How much does it cost to replace a 2018 GMC Sierra 1500 alternator?
Using a used part, a 2018 GMC Sierra 1500 alternator replacement typically runs $250–$530 all-in: the median used alternator for this year lists at $157, and independent-shop labor for alternator replacement typically takes 1–2.5 hours at $95–$150/hr ($95–$375). Labor is a national part-level estimate, not a quote for your vehicle.
Will a 2018 GMC Sierra 1500 alternator fit another year?
Based on salvage-yard interchange data, listings for the 2018 GMC Sierra 1500 alternator also appear under model years 2014, 2015, 2016, 2017, 2019, 2020, suggesting these years share compatible fitments. Always verify the exact part number, drivetrain, trim, and your VIN before buying — interchange compatibility can vary by variant.