2018 GMC Terrain alternator price snapshot
- Low
- $50
- Average
- $137
- High
- $280
Year-specific price guide
Used 2018 GMC Terrain Alternator prices
Year-specific used alternator pricing for the 2018 GMC Terrain, 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 updatedSep 21, 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 Terrain alternator
A used 2018 GMC Terrain alternator costs between $50 and $280, with a median of $110 from 97 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 Terrain alternator costs $50 to $280, with a median asking price of $110. Based on 97 priced salvage yard listings across the US, compatible across 2017–2023 (7 model years), updated Sep 21, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$110
Grade B (good)$121
USD
Condition comparison
Price by part grade
Grade AClean / low wear$56–$28060 listings
Grade BStandard used$56–$28035 listings
Grade XUngraded$50–$802 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $56–$280 | 60 | |
| Grade BStandard used | $56–$280 | 35 | |
| Grade XUngraded | $50–$80 | 2 |
Median by grade
Grade price comparison
Grade A$110
Grade B$121
Ungraded$80
Median asking price by seller-reported condition grade · $50–$280 overall range
Replacement cost
What is the 2018 GMC Terrain alternator replacement cost?
- Used part
- $110
- 2018 GMC Terrain median asking price
- Labor
- $95–$375
- 1–2.5 hours at $95–$150/hr
- Estimated total
- $205–$485
- 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 Terrain compare?
The 2018 guide is based on 150 observed listings, including 97 with posted prices. Its $110 median is 29% above the GMC Terrain guide's $85 median.
Among the 11 model years with current price data, 2018 ranks #7 from lowest to highest median.
Interchange data shows this part is also listed under model years 2017, 2019, 2020, 2021, 2022, 2023. 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 Terrain alternator cost in other years?
202546 listings$175$65 – $261202450 listings$80$40 – $216202350 listingsCompatible$60$60 – $190202250 listingsCompatible$151$56 – $151202150 listingsCompatible$151$56 – $151202071 listingsCompatible$161$50 – $257201973 listingsCompatible$75$35 – $2882017150 listingsCompatible$76$35 – $2802016150 listings$75$30 – $3162015150 listings$75$35 – $280
Keep browsing this vehicle
What other GMC Terrain parts are priced?
01wide ±172%
AC Compressor
$110median
$35$413
02wide ±163%
ABS Module
$116median
$35$413
03wide ±188%
Air Bag
$241median
$45$950
04wide ±151%
Axle Shaft
$102median
$34$343
05wide ±194%
Blower Motor
$80median
$20$331
06wide ±264%
Brake Caliper
$55median
$20$310
07wide ±116%
Rear Bumper Assembly
$524median
$153$1,372
08wide ±184%
Front Bumper
$270median
$61$1,055
09wide ±165%
Rear Bumper
$230median
$65$825
10wide ±273%
Car Radio
$106median
$20$599
11wide ±213%
Center Console
$106median
$25$476
12wide ±85%
AC Condenser
$162median
$49$325
13wide ±146%
Control Arm
$84median
$40$285
14
Differential
Price data updating
15wide ±72%
Door Assembly
$946median
$362$1,725
16wide ±169%
Drive Shaft
$193median
$51$705
17wide ±192%
Engine
$1,525median
$300$6,144
18wide ±204%
Engine Computer
$94median
$30$413
19wide ±275%
Exhaust Manifold
$157median
$35$900
20wide ±78%
Fender
$325median
$115$625
21wide ±146%
Fog Light
$100median
$34$325
22wide ±141%
Front Seat
$175median
$67$559
23wide ±135%
Fuel Pump
$125median
$25$362
24wide ±117%
Fuel Tank
$163median
$40$420
25wide ±119%
Grille
$270median
$59$700
26wide ±186%
Headlight Assembly
$386median
$75$1,509
27spread ±22%
Heater Core
$116median
$75$126
28wide ±62%
Hood
$642median
$250$1,044
29wide ±150%
Ignition Switch
$106median
$24$343
30
Instrument Cluster
Price data updating
31wide ±158%
Intake Manifold
$76median
$25$265
32wide ±152%
Master Cylinder
$99median
$30$331
33wide ±207%
Side Mirror
$150median
$25$646
34wide ±193%
Power Steering Pump
$100median
$30$415
35wide ±142%
Quarter Panel
$420median
$206$1,400
36wide ±240%
Radiator
$120median
$25$600
37wide ±170%
Rear View Mirror
$110median
$20$395
38wide ±240%
Starter
$75median
$20$380
39wide ±113%
Steering Column
$168median
$35$413
40wide ±162%
Steering Rack
$145median
$30$500
41wide ±114%
Steering Wheel
$145median
$39$371
42wide ±194%
Strut
$75median
$30$321
43wide ±158%
Sunroof
$200median
$85$715
44wide ±223%
Tail Light
$150median
$25$694
45wide ±108%
Tailgate
$1,400median
$226$3,250
46wide ±197%
Throttle Body
$66median
$20$280
47wide ±75%
Torque Converter
$200median
$100$400
48wide ±286%
Transfer Case
$283median
$80$1,700
49wide ±228%
Transmission
$755median
$150$3,594
50wide ±202%
Transmission Control Module
$96median
$20$407
51wide ±105%
Turbocharger
$200median
$79$500
52wide ±133%
Water Pump
$50median
$24$157
53wide ±226%
Wheels
$187median
$35$880
54wide ±138%
Window Regulator
$100median
$30$305
Common questions
2018 GMC Terrain alternator FAQ
How much is a used 2018 GMC Terrain alternator?
Based on 97 priced salvage-yard listings, a used 2018 GMC Terrain alternator lists between $50 and $280, with a median asking price of $110.
How much does it cost to replace a 2018 GMC Terrain alternator?
Using a used part, a 2018 GMC Terrain alternator replacement typically runs $205–$485 all-in: the median used alternator for this year lists at $110, 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 Terrain alternator fit another year?
Based on salvage-yard interchange data, listings for the 2018 GMC Terrain alternator also appear under model years 2017, 2019, 2020, 2021, 2022, 2023, 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.