NHTSA campaign 20V721000 · Isuzu campaign V2006
Isuzu Technical Center of America, Inc. Recall 20V-721: Chassis Harness/Coolant Return Hose Could Chafe
NHTSA recall 20V721000 (Isuzu campaign V2006) was reported by Isuzu Technical Center of America, Inc. on November 20, 2020, with 46 vehicles potentially affected (per NHTSA). NHTSA's record lists the Chevrolet Low Cab Forward 4500 and Isuzu NPR HD for the 2020 model year. Owners were notified on December 11, 2020, per NHTSA.
Updated daily from NHTSA's recall files
Is my vehicle included?
This page lists, by model year, the vehicles NHTSA's recall record names for campaign 20V721000 in the model years try.vin imports (1995 and later); NHTSA's own record can list more. A model year on the list doesn't mean every vehicle of that year is included, and some may already have been repaired.
To see whether a specific vehicle is included and still needs the repair, enter its VIN at nhtsa.gov/recalls.
Free VIN check: decode a VIN to see its year, make and model.
Key facts
- NHTSA campaign
- 20V721000 (also written 20V-721 or 20V721)
- Filed by
- Isuzu Technical Center of America, Inc.
- Isuzu campaign number
- V2006
- Report received
- Potentially affected
- 46 vehicles (per NHTSA)
- Component
- Electrical System — Wiring
- Owners notified
Repair completion: 89.13% (latest rate the manufacturer reported to NHTSA; dataset updated October 21, 2026)
NHTSA cautions against comparing completion rates across recalls or manufacturers. How try.vin reads them.
Vehicles listed for this recall
NHTSA's recall record lists these vehicles for recall 20V721000. try.vin imports model years 1995 and later, so NHTSA's own list can be longer. Model years with a try.vin recall page link to it. Build dates are NHTSA's range for a model year (per NHTSA); a vehicle built in that range is not necessarily included.
Chevrolet
Chevrolet Low Cab Forward 4500
Isuzu
Isuzu NPR HD
NHTSA's recall notice
As NHTSA's recall record states it for campaign 20V721000.
Defect description
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 harness and/or hose, ultimately causing a hole in the hose with the potential for engine coolant to leak and/or causing damage to the harness with the potential for a short circuit.
Safety 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.
Manufacturer 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.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
Sources
Official NHTSA notice for recall 20V721000
Campaign details come from NHTSA's recall files, which try.vin imports once a day. The plain-language subject and the completion rate come from the U.S. Department of Transportation's Recalls Data dataset. How try.vin reads recall data.