2021 Cadillac XT4 transmission control module — Differential Lock, (rear differential) price snapshot
- Low
- $40
- Average
- $150
- High
- $207
Year & trim-specific price guide
Used 2021 Cadillac XT4 Transmission Control Module — Differential Lock, (rear differential) prices
Trim-specific pricing for the Differential Lock, (rear differential) variant of the 2021 Cadillac XT4 transmission control module, built from 48 real salvage yard listings with condition grade 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 10, 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.
Price summary
A used 2021 Cadillac XT4 transmission control module (Differential Lock, (rear differential)) costs $40 to $207, with a median asking price of $188. Based on 48 priced salvage yard listings across the US, updated Oct 10, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$207
Grade B (good)$177
Grade C (fair)$50
USD
Condition comparison
Price by part grade
Grade AClean / low wear$40–$20741 listings
Grade BStandard used$41–$1775 listings
Grade CVisible wear$50–$501 listings
Grade XUngraded$60–$601 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $40–$207 | 41 | |
| Grade BStandard used | $41–$177 | 5 | |
| Grade CVisible wear | $50–$50 | 1 | |
| Grade XUngraded | $60–$60 | 1 |
Median by grade
Grade price comparison
Grade A$207
Grade B$177
Grade C$50
Ungraded$60
Median asking price by seller-reported condition grade · $40–$207 overall range
Trim-specific context
How does the Differential Lock, (rear differential) compare?
This pricing covers the Differential Lock, (rear differential) variant of the 2021 Cadillac XT4 transmission control module, based on 48 priced listings. Its $188 median is 25% above the 2021 Cadillac XT4 transmission control module overall median of $150.
There are 23 other transmission control module variants available for the 2021 Cadillac XT4.
Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.
Same trim, other years
Differential Lock, (rear differential) in other model years
Same year, other trims
What other 2021 Cadillac XT4 transmission control module variants are available?
Communication, telematics (OnStar opt UE1), ID 84721683
50 listings$177$50 – $232Communication, wireless charger, (center console)
50 listings$183$56 – $232Driver Assist, park assist, (RH inner quarter panel), w/o automatic park control; front and rear park assist (opt UD5)
50 listings$190$132 – $274Driver Assist, park assist, (RH inner quarter panel), w/o automatic park control; rear park assist (opt UD7)
50 listings$195$35 – $232Temperature, (center of heater box)
50 listings$101$40 – $270Theft-Locking, lock, (rear view mirror), ID 13523281
50 listings$195$46 – $195Communication, telematics (OnStar opt UE1), ID 84613034
49 listings$195$45 – $226Communication, telematics (OnStar opt UE1), ID 84676081
49 listings$195$45 – $226fuel pump, (RH inner quarter panel)
49 listings$195$41 – $232Memory, (seat, mounted under seat), LH
49 listings$190$41 – $232Theft-Locking, keyless entry, (RH dash), ID 13518841
49 listings$80$35 – $195Air Bag, (below center console), pre-crash system (opt UGN)
48 listings$151$51 – $232Body Control (BCM), (LH kick panel)
48 listings$51$51 – $51Memory, (seat, mounted under seat), RH
48 listings$99$40 – $218Transmission, (on transmission)
48 listings$125$46 – $232Air Bag, (below center console), w/o pre-crash system
47 listings$46$41 – $243Information-GPS-TV, (LH quarter panel)
47 listings$172$81 – $405Steering, (steering column)
47 listings$111$50 – $270Theft-Locking, keyless entry, (RH dash), ID 13518843
46 listings$190$66 – $232Driver Assist, park assist, (RH inner quarter panel), automatic park control (opt UKG)
45 listings$110$40 – $270Theft-Locking, keyless entry, (RH dash), ID 13529583
42 listings$130$40 – $270Theft-Locking, lock, (rear view mirror), ID 13595510
34 listings$101$30 – $270Suspension, (LH inner quarter panel), (damping, opt F45)
15 listings$121$101 – $125Back to full guide
2021 Cadillac XT4 transmission control module — all trims
Common questions
2021 Cadillac XT4 transmission control module (Differential Lock, (rear differential)) FAQ
How much is a used 2021 Cadillac XT4 transmission control module (Differential Lock, (rear differential))?
Based on 48 priced salvage-yard listings, a used 2021 Cadillac XT4 transmission control module in the Differential Lock, (rear differential) variant lists between $40 and $207, with a median asking price of $188.
Which years use the Differential Lock, (rear differential) transmission control module?
The Differential Lock, (rear differential) variant appears in model years 2019, 2020, 2021, 2022, 2023, 2024, 2025. Prices and availability may differ by year.