Used 2018 GMC Acadia alternator – 3.6L, 155 amp (opt KW8)

Year & trim-specific price guide

Used 2018 GMC Acadia Alternator — 3.6L, 155 amp (opt KW8) prices

Trim-specific pricing for the 3.6L, 155 amp (opt KW8) variant of the 2018 GMC Acadia alternator, built from 47 real salvage yard listings with condition grade detail.
SKWritten bySaurabh Kumar · Co-Founder & CTO
ASReviewed byAmbika Sharma · Co-Founder & COO
Last updatedSep 21, 2026

2018 GMC Acadia · 3.6L, 155 amp (opt KW8)

$162

median asking price

47 priced listings · $50–$249

Price summary

A used 2018 GMC Acadia alternator (3.6L, 155 amp (opt KW8)) costs $50 to $249, with a median asking price of $162. Based on 47 priced salvage yard listings across the US, updated Sep 21, 2026. Prices exclude shipping, core charges, and installation.

Grade A (excellent)$162
Grade B (good)$165

2018 GMC Acadia alternator — 3.6L, 155 amp (opt KW8) price snapshot

USD
Low
$50
Average
$146
High
$249
47 priced listings used · last updated Sep 21, 2026· How we price·

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Reporting price for 2018 GMC Acadia Alternator (3.6L, 155 amp (opt KW8))

Reason

Condition comparison

Price by part grade

Grade AClean / low wear$50–$24934 listings
Grade BStandard used$56–$19313 listings

Median by grade

Grade price comparison

Median asking price by seller-reported condition grade · $50–$249 overall range

Trim-specific context

How does the 3.6L, 155 amp (opt KW8) compare?

This pricing covers the 3.6L, 155 amp (opt KW8) variant of the 2018 GMC Acadia alternator, based on 47 priced listings. Its $162 median is 2% above the 2018 GMC Acadia alternator overall median of $159.

There are 2 other alternator variants available for the 2018 GMC Acadia.

Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.

Same trim, other years

3.6L, 155 amp (opt KW8) in other model years

All years
202340 listings$80$40 – $310202217 listings$161$45 – $236202135 listings$80$35 – $310202042 listings$80$50 – $310201948 listings$135$35 – $237

Same year, other trims

What other 2018 GMC Acadia alternator variants are available?

3.6L, 170 amp (opt KW7)

50 listings$162$45 – $249

2.5L

48 listings$107$25 – $268

Back to full guide

2018 GMC Acadia alternator — all trims

View 2018 guide

Common questions

2018 GMC Acadia alternator (3.6L, 155 amp (opt KW8)) FAQ

How much is a used 2018 GMC Acadia alternator (3.6L, 155 amp (opt KW8))?

Based on 47 priced salvage-yard listings, a used 2018 GMC Acadia alternator in the 3.6L, 155 amp (opt KW8) variant lists between $50 and $249, with a median asking price of $162.

Which years use the 3.6L, 155 amp (opt KW8) alternator?

The 3.6L, 155 amp (opt KW8) variant appears in model years 2018, 2019, 2020, 2021, 2022, 2023. Prices and availability may differ by year.

2018 GMC Acadia Alternator · 3.6L, 155 amp (opt KW8) Prices | Part Price Guide