UnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRA
UnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRA
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UNDERCOVER

UnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRA

4.6 stars out of 240 reviews
(4.6)|
240 ratings
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Key item features

  • Undercover
  • UC1138L-G1W
  • NEW


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2016-2018 GMC SIERRA
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Current price is $2,018.45
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Columbus, 43215
Arrives by Thu, Feb 5
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Sold and shipped by AD Group Co
3.941176470588235 stars out of 5, based on 51 seller reviews(3.9)
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UnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRA
UnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRA
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Comparison Chart:
Truck tonneau cover typeOne Piece SolidUnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRA-Undercover Uc1228l Gba Elite Lx Tonneau Cover Fits select: 2020-2023 CHEVROLET SILVERADO-Undercover Uc1228l Gaz Elite Lx Tonneau Cover Fits select: 2020-2023 CHEVROLET SILVERADOOne Piece SolidUnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2208L-D4 | Fits 2021 - 2023 Ford F-150 (D4 - Lucid Red) 5' 7" Bed (67.1")One Piece SolidUndercover Uc2218l Js Elite Lx Tonneau Cover Fits 21 23 F 150 Fits select: 2021-2023 FORD F150One Piece SolidUnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2208L-HX | Fits 2021 - 2023 Ford F-150 (HX - Antimatter Blue) 5' 7" Bed (67.1")One Piece SolidUnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2218L-YZ | Fits 2021 - 2023 Ford F-150 (YZ or Z1 - Oxford White) 6' 7" Bed (78.9")-UnderCover UC2208L-AZ Elite LX Tonneau Cover Fits 21-22 F-150 Fits select: 2021-2023 FORD F150One Piece SolidUnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC1238L-50 | Fits 2019 - 2023 GMC Sierra 1500 w/ MultiPro TG- 50(GAZ)(WA8624) - Summit White (does not fit Carbon Bed) 5' 10" Bed (69.9")-UnderCover 2019-Current Sierra 1500(EXCL Carbon Pro)6.5FT STD/EXT/Crew w/o MultiPro TG Elite LX 50
Vehicle makeGMCUnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRA-Undercover Uc1228l Gba Elite Lx Tonneau Cover Fits select: 2020-2023 CHEVROLET SILVERADO-Undercover Uc1228l Gaz Elite Lx Tonneau Cover Fits select: 2020-2023 CHEVROLET SILVERADOFordUnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2208L-D4 | Fits 2021 - 2023 Ford F-150 (D4 - Lucid Red) 5' 7" Bed (67.1")FordUndercover Uc2218l Js Elite Lx Tonneau Cover Fits 21 23 F 150 Fits select: 2021-2023 FORD F150FordUnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2208L-HX | Fits 2021 - 2023 Ford F-150 (HX - Antimatter Blue) 5' 7" Bed (67.1")FordUnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2218L-YZ | Fits 2021 - 2023 Ford F-150 (YZ or Z1 - Oxford White) 6' 7" Bed (78.9")FordUnderCover UC2208L-AZ Elite LX Tonneau Cover Fits 21-22 F-150 Fits select: 2021-2023 FORD F150GMCUnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC1238L-50 | Fits 2019 - 2023 GMC Sierra 1500 w/ MultiPro TG- 50(GAZ)(WA8624) - Summit White (does not fit Carbon Bed) 5' 10" Bed (69.9")GMCUnderCover 2019-Current Sierra 1500(EXCL Carbon Pro)6.5FT STD/EXT/Crew w/o MultiPro TG Elite LX 50
Vehicle modelSierra 1500UnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRAUC1228LGBAUndercover Uc1228l Gba Elite Lx Tonneau Cover Fits select: 2020-2023 CHEVROLET SILVERADOUC1228LGAZUndercover Uc1228l Gaz Elite Lx Tonneau Cover Fits select: 2020-2023 CHEVROLET SILVERADOF-150UnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2208L-D4 | Fits 2021 - 2023 Ford F-150 (D4 - Lucid Red) 5' 7" Bed (67.1")F-150Undercover Uc2218l Js Elite Lx Tonneau Cover Fits 21 23 F 150 Fits select: 2021-2023 FORD F150F-150UnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2208L-HX | Fits 2021 - 2023 Ford F-150 (HX - Antimatter Blue) 5' 7" Bed (67.1")F-150UnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2218L-YZ | Fits 2021 - 2023 Ford F-150 (YZ or Z1 - Oxford White) 6' 7" Bed (78.9")F-150UnderCover UC2208L-AZ Elite LX Tonneau Cover Fits 21-22 F-150 Fits select: 2021-2023 FORD F150Sierra 1500UnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC1238L-50 | Fits 2019 - 2023 GMC Sierra 1500 w/ MultiPro TG- 50(GAZ)(WA8624) - Summit White (does not fit Carbon Bed) 5' 10" Bed (69.9")UC1208L-50UnderCover 2019-Current Sierra 1500(EXCL Carbon Pro)6.5FT STD/EXT/Crew w/o MultiPro TG Elite LX 50
Vehicle year2016UnderCover UC1138L-G1W Elite LX Tonneau Cover; Abalone White; Fits select: 2016-2018 GMC SIERRA-Undercover Uc1228l Gba Elite Lx Tonneau Cover Fits select: 2020-2023 CHEVROLET SILVERADO-Undercover Uc1228l Gaz Elite Lx Tonneau Cover Fits select: 2020-2023 CHEVROLET SILVERADO-UnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2208L-D4 | Fits 2021 - 2023 Ford F-150 (D4 - Lucid Red) 5' 7" Bed (67.1")2021Undercover Uc2218l Js Elite Lx Tonneau Cover Fits 21 23 F 150 Fits select: 2021-2023 FORD F1502021UnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2208L-HX | Fits 2021 - 2023 Ford F-150 (HX - Antimatter Blue) 5' 7" Bed (67.1")2021UnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC2218L-YZ | Fits 2021 - 2023 Ford F-150 (YZ or Z1 - Oxford White) 6' 7" Bed (78.9")-UnderCover UC2208L-AZ Elite LX Tonneau Cover Fits 21-22 F-150 Fits select: 2021-2023 FORD F1502019UnderCover Elite LX One-Piece Truck Bed Tonneau Cover | UC1238L-50 | Fits 2019 - 2023 GMC Sierra 1500 w/ MultiPro TG- 50(GAZ)(WA8624) - Summit White (does not fit Carbon Bed) 5' 10" Bed (69.9")2019UnderCover 2019-Current Sierra 1500(EXCL Carbon Pro)6.5FT STD/EXT/Crew w/o MultiPro TG Elite LX 50
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Customer ratings & reviews

4.6 out of 5 stars
stars240 ratings240 reviews
How item rating is calculated
  1. 5 stars77% (185)
  2. 4 stars13% (31)
  3. 3 stars4% (9)
  4. 2 stars0% (1)
  5. 1 star6% (14)

Reviews summary

Pros
  • : Has a perfect color match with trucks.
  • : Cover fits truck bed exactly with matching hardware.
  • : Made with high-end components that surpass standards.
  • : Matches bedrug material and color precisely.
  • : Paint color precisely matches the original vehicle color.
Neutral
  • : Can be straightforward, but also confusing for some users.
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Showing 1-3 of 240 reviews

Sep 17, 2025
Katherine C.
5 out of 5 stars review

Seller Verified Purchase

Product is beautiful

Everything matched well. No instructions came with the tonneau top at all. We used youtube videos to help. As for customer service of this company: it was horrible. Ordered on July24th. Got it September 4th. We had to drive 115 miles to get it. Everytime I called they gave me different dates. I would not buy from them again. The product itself was good quality is about the only positive I can say.

Review from realtruck.com
Helpful?0YZN8NGRQ33L583735722
Oct 14, 2024
Kenneth A.
5 out of 5 stars review

Seller Verified Purchase

UnderCover tonneau

Purchased the color matched Undercover Elite LX tonneau cover and I'm very pleased. The color match is spot on, and the fit and finish are excellent. The inside is finished with material that matches the BedRug I installed and matched perfectly. Installation is simple and fast, measure for the four brackets, tighten down 8 bolts, snap on the pistons, then adjust the latches for the locks. Very easy and takes around 30 minutes. I think it's a little on the high side for price, but that's how I feel about EVERYTHING today. Even with the price, would I buy it again - yes!! I previously owned another major brand tonneau on my last truck and this UnderCover tonneau blows that brand away.

Review from realtruck.com
Helpful?0YZN8NGRQ33L583735722
Jun 25, 2025
Douglas R.
5 out of 5 stars review

Seller Verified Purchase

Still Waiting To Receive My Item

I ordered the item on 6/9/25 and it still has not shipped so I can't rate it.

Review from realtruck.com
Helpful?0YZN8NGRQ33L583735722