Used 2018 GMC Terrain engine computer – Emission Control, (DEF tank module)

Year & trim-specific price guide

Used 2018 GMC Terrain Engine Computer — Emission Control, (DEF tank module) prices

Trim-specific pricing for the Emission Control, (DEF tank module) variant of the 2018 GMC Terrain engine computer, built from 21 real salvage yard listings with condition grade detail.
SKWritten bySaurabh Kumar · Co-Founder & CTO
ASReviewed byAmbika Sharma · Co-Founder & COO
Last updatedSep 17, 2026

2018 GMC Terrain · Emission Control, (DEF tank module)

$100

median asking price

21 priced listings · $30–$325

Price summary

A used 2018 GMC Terrain engine computer (Emission Control, (DEF tank module)) costs $30 to $325, with a median asking price of $100. Based on 21 priced salvage yard listings across the US, updated Sep 17, 2026. Prices exclude shipping, core charges, and installation.

Grade A (excellent)$125
Grade B (good)$85

2018 GMC Terrain engine computer — Emission Control, (DEF tank module) price snapshot

USD
Low
$30
Average
$119
High
$325
21 priced listings used · last updated Sep 17, 2026· How we price·

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Reporting price for 2018 GMC Terrain Engine Computer (Emission Control, (DEF tank module))

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Condition comparison

Price by part grade

Grade AClean / low wear$55–$32511 listings
Grade BStandard used$68–$2307 listings
Grade XUngraded$30–$793 listings

Median by grade

Grade price comparison

Median asking price by seller-reported condition grade · $30–$325 overall range

Trim-specific context

How does the Emission Control, (DEF tank module) compare?

This pricing covers the Emission Control, (DEF tank module) variant of the 2018 GMC Terrain engine computer, based on 21 priced listings. Its $100 median is 3% above the 2018 GMC Terrain engine computer overall median of $97.

There are 3 other engine computer variants available for the 2018 GMC Terrain.

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

Same trim, other years

Emission Control, (DEF tank module) in other model years

All years
201941 listings$78$30 – $315

Same year, other trims

What other 2018 GMC Terrain engine computer variants are available?

Electronic Control Module, (LH engine compartment), 1.5L

50 listings$94$61 – $104

Electronic Control Module, (LH engine compartment), 2.0L

50 listings$94$61 – $104

Electronic Control Module, (LH engine compartment), 1.6L

44 listings$145$65 – $305

Back to full guide

2018 GMC Terrain engine computer — all trims

View 2018 guide

Common questions

2018 GMC Terrain engine computer (Emission Control, (DEF tank module)) FAQ

How much is a used 2018 GMC Terrain engine computer (Emission Control, (DEF tank module))?

Based on 21 priced salvage-yard listings, a used 2018 GMC Terrain engine computer in the Emission Control, (DEF tank module) variant lists between $30 and $325, with a median asking price of $100.

Which years use the Emission Control, (DEF tank module) engine computer?

The Emission Control, (DEF tank module) variant appears in model years 2018, 2019. Prices and availability may differ by year.

2018 GMC Terrain Engine Computer · Emission Control, (DEF tank module) Prices | Part Price Guide