Chevrolet Low Cab Forward 4500, Isuzu Npr Hd, model year 2020. Filed by Isuzu Technical Center of America, Inc. and reported to NHTSA on 20 November 2020. 46 vehicles potentially affected.
What the notice says Isuzu Technical Center of America, Inc. (Isuzu) is recalling certain 2020 NPR-HD (Crew Cab) and Chevrolet 4500 (Crew Cab) vehicles equipped with 6.6L gasoline engines. The chassis harness and the coolant return hose from the radiator to the reservoir (surge hose) may chafe. Continued chafing could cause wear in the …
Is your vehicle included? Check with your VIN at NHTSA, or ask a dealer. This page is an independent copy of the notice, kept so you can see what changed after it was published. It is not the authority, and the authority’s own text is the one to act on.
Isuzu's own number for this recall: V2006. That is the number on the owner letter and on the dealer paperwork. 20V721 is the number NHTSA gave the same campaign, and the number this page is filed under. They are one recall, written two ways.
What owners ask about this recall
- Which vehicles does recall 20V721 cover?
- Chevrolet Low Cab Forward 4500, Isuzu NPR HD, model year 2020.
- What is wrong with them?
- Isuzu Technical Center of America, Inc. (Isuzu) is recalling certain 2020 NPR-HD (Crew Cab) and Chevrolet 4500 (Crew Cab) vehicles equipped with 6.6L gasoline engines. The chassis harness and the coolant return hose from the radiator to the reservoir (surge hose) may chafe.
- What can happen if it is not put right?
- Leaking engine coolant and/or a damaged wire harness may result in a no-start condition, an engine stall, or an electrical short. These scenarios increase the risk of a crash or fire.
- Is there a fix yet?
- Yes, and it is free. Isuzu and Chevrolet will notify their respective vehicle owners and dealers of this recall, and specifically of the need to adjust the positive cable in subject vehicles, and owners will be informed that the recall repairs will be done free of charge. The recall began December 11, 2020.
- What should I do now?
- Check your own vehicle by its VIN with NHTSA, which is the record to act on. Isuzu calls this recall V2006, which is the number on the owner letter and the dealer paperwork.
Answered from the register this site holds. NHTSA is the record to act on.
What the authority says can happen if this is not fixed: “Leaking engine coolant and/or a damaged wire harness may result in a no-start condition, an engine stall, or an electrical short. These scenarios increase the risk of a crash or fire.”
affected
in the notice
caught
| Campaign | 20V721 |
|---|---|
| Filed by | Isuzu Technical Center of America, Inc. |
| System at fault | Electrical System:Wiring |
| Reported to NHTSA | 20 November 2020 |
| Model years | 2020-2020 |
| Vehicles named | CHEVROLET LOW CAB FORWARD 4500, ISUZU NPR HD |
What the notice says today
The consequence
Leaking engine coolant and/or a damaged wire harness may result in a no-start condition, an engine stall, or an electrical short. These scenarios increase the risk of a crash or fire.
The remedy
Isuzu and Chevrolet will notify their respective vehicle owners and dealers of this recall, and specifically of the need to adjust the positive cable in subject vehicles, and owners will be informed that the recall repairs will be done free of charge. The recall began December 11, 2020. For additional information, Isuzu owners may contact Isuzu Customer Relations at 1-866-441-9638 and Chevrolet owners may contact the GM Medium Duty Truck assistance line at 1-800-862-4389. Isuzu's number for this recall is V2006.
What it said before
This campaign is in the register but not yet in the dated wording archive, so we cannot yet say whether its text has moved. It enters the archive on the next pass.
This is one of 1,836 notices in the record whose component field names electrical system. Across that group the median wait before owners were written to was 41 days.
Last checked . No change has been recorded in the wording.
The models named here, across their whole recall history
How to cite this record
Quoting the wording on this page means quoting a version, so the date belongs in the citation:
CarsMultiverse, recall 20V721, wording as read on 16 September 2026. https://carsmultiverse.com/recall/20v721/
The cross-border matches used on this site are deposited as a citable dataset: doi:10.5281/zenodo.22087136. The recall wording itself is published by the national authority named above and is theirs, not ours.
The recall record and its wording are published by the US National Highway Traffic Safety Administration and are US Government public domain. The dated archive, the comparison and any before-and-after above are CarsMultiverse. How fresh every engine behind this page is, is public on the status page. To check a specific vehicle, use NHTSA’s own VIN lookup.
Other Isuzu notices we hold
- 26V210: 2025-2027 Chevrolet Low Cab Forward 5500XD, 4500XD, Isuzu NRR, NPR HD, NPR XD, 2025-2026 Chevrolet Low Cab Forward 4500HD, and Isuzu NRR EV
- 25V719: 2022-2026 Isuzu FVR, 2023-2026 Chevrolet 7500XD, 2018-2026 Chevrolet 6500XD, and Isuzu FTR
- 25V630: 2022-2026 Isuzu FVR, Isuzu FTR, Chevrolet 6500XD, and 2023-2026 Chevrolet 7500XD
- 25V319: 2025 NRR-EV
- 25V217: 2025 NRR EV trucks
- 24V467: 2025 FTR
- 24V157: 2019-2024 FTR, 2020-2024 Chevrolet LCF 6500XD, 2022-2024 FVR, and 2023-2024 Chevrolet LCF 7500XD
- 23V564: 2023-2024 NPR Gas, NPR HD Gas, 2024 NQR Gas, NRR Gas, 2023-2024 Chevrolet LCF 3500HG, Chevrolet LCF 4500HG, 2024 Chevrolet LCF 5500HG, and Chevrolet LCF 5500XG
All 40 Isuzu campaigns we hold · Every manufacturer in the record
The fingerprint of this notice
We take a SHA-256 of each of the three blocks of text the authority publishes and keep the first eight characters. As we last read campaign 20V721 on 23 August 2026, they were:
- Defect summary
43b08553 - Consequence
d45c4c5a - Remedy
eb75ee56
We first read this notice on 21 August 2026. It has not moved since. If it ever does, these characters will not match, and the change will be dated here.
The wording we hold for 20V721 · how the whole register is watched
This notice names one vehicle among several registers that have written about it. Every notice this site holds for the Isuzu NPR HD, in all seven, is kept on that vehicle's own page, with the newest in each.
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