2018 GMC Sierra 1500 transmission control module — Transmission, (firewall mounted) price snapshot
- Low
- $65
- Average
- $192
- High
- $330
Year & trim-specific price guide
Used 2018 GMC Sierra 1500 Transmission Control Module — Transmission, (firewall mounted) prices
Trim-specific pricing for the Transmission, (firewall mounted) variant of the 2018 GMC Sierra 1500 transmission control module, built from 43 real salvage yard listings with condition grade detail.
Price summary
A used 2018 GMC Sierra 1500 transmission control module (Transmission, (firewall mounted)) costs $65 to $330, with a median asking price of $227. Based on 43 priced salvage yard listings across the US, updated Aug 25, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$241
Grade B (good)$227
USD
Condition comparison
Price by part grade
Grade AClean / low wear$65–$33026 listings
Grade BStandard used$75–$24115 listings
Grade CVisible wearUpdating
Grade XUngraded$70–$802 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $65–$330 | 26 | |
| Grade BStandard used | $75–$241 | 15 | |
| Grade CVisible wear | Updating | — | |
| Grade XUngraded | $70–$80 | 2 |
Median by grade
Grade price comparison
Grade A$241
Grade B$227
Ungraded$80
Median asking price by seller-reported condition grade · $65–$330 overall range
Trim-specific context
How does the Transmission, (firewall mounted) compare?
This pricing covers the Transmission, (firewall mounted) variant of the 2018 GMC Sierra 1500 transmission control module, based on 43 priced listings. Its $227 median is 82% above the 2018 GMC Sierra 1500 transmission control module overall median of $125.
There are 25 other transmission control module variants available for the 2018 GMC Sierra 1500.
Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.
Same year, other trims
What other 2018 GMC Sierra 1500 transmission control module variants are available?
Memory, (under driver seat)
50 listings$95$50 – $241Network Gateway, (LH rear engine compartment), (ID 13599318)
49 listings$241$40 – $241Fuel Pump, (LH frame rail)
48 listings$99$45 – $241Body Control (BCM), (under steering column)
48 listings$237$51 – $307Communication, telematics, (center dash, behind radio)
48 listings$99$40 – $241Transfer Case, (LH dash)
48 listings$99$45 – $241Multifunction, (roof mounted)
45 listings$147$50 – $241Driver Assist, (park assist), (RH cab back panel), opt UD7
45 listings$110$50 – $282Towing Control, (LH rear frame)
44 listings$95$45 – $241Air Bag, (on transmission tunnel), ID 13507217
44 listings$153$41 – $272Air Bag, (on transmission tunnel), ID 13522335
43 listings$104$75 – $310Driver Assist, (park assist), (RH cab back panel), opt UD5
43 listings$162$45 – $232Temperature, (RH under dash), ID 84237325
42 listings$162$35 – $271Information-GPS-TV, (RH dash), (human machine interface, HMI), ID 84251839
41 listings$241$46 – $383Information-GPS-TV, (RH dash), (human machine interface, HMI), ID 84331775
41 listings$241$46 – $383Information-GPS-TV, (RH dash), (human machine interface, HMI), ID 84364934
41 listings$241$46 – $383Communication, wireless charger, (under console)
39 listings$99$46 – $241Information-GPS-TV, (RH dash), (human machine interface, HMI), ID 84251841
39 listings$171$70 – $560Information-GPS-TV, (RH dash), (human machine interface, HMI), ID 84331776
39 listings$171$70 – $560Information-GPS-TV, (RH dash), (human machine interface, HMI), ID 84364936
39 listings$171$70 – $560Information-GPS-TV, (RH dash), (human machine interface, HMI), ID 84513027
39 listings$171$70 – $560Suspension, (rear frame)
33 listings$125$35 – $290Information-GPS-TV, (RH dash), (human machine interface, HMI), ID 84296482
32 listings$228$50 – $350Information-GPS-TV, (LH dash), (human machine interface bypass)
29 listings$110$45 – $343Hybrid-Electric, (RH front engine compartment), (opt HP5)
6 listings$325$250 – $842Back to full guide
2018 GMC Sierra 1500 transmission control module — all trims
Common questions
2018 GMC Sierra 1500 transmission control module (Transmission, (firewall mounted)) FAQ
How much is a used 2018 GMC Sierra 1500 transmission control module (Transmission, (firewall mounted))?
Based on 43 priced salvage-yard listings, a used 2018 GMC Sierra 1500 transmission control module in the Transmission, (firewall mounted) variant lists between $65 and $330, with a median asking price of $227.
Which years use the Transmission, (firewall mounted) transmission control module?
In our current dataset, the Transmission, (firewall mounted) variant appears only for the 2018 model year.