2020 Chevrolet Low Cab Forward 4500, 2020 Isuzu NPR HD Recall: Chassis harness and the coolant return hose from the radiator to the…
NHTSA campaign 20V721000 · Electrical System · filed Nov 20, 2020 · verified Jul 30, 2026
The defect
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.
The risk
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.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
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.
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.
Affected vehicles
Related recalls
More Chevrolet Low Cab Forward 4500 recalls
- 2020 Chevrolet Low Cab Forward 4500 and 1 other model — Positive cable connecting the battery to the starter may be…
- 2017–2019 Chevrolet Low Cab Forward 3500 and 4 other models — Power supply bolt in the relay box may not have been…
- 2019 Chevrolet Low Cab Forward 4500 and 5 other models — Odometer accurately measures the distance traveled in…
- 2016–2017 Chevrolet Low Cab Forward 3500 and 7 other models — These extinguishers may become clogged, preventing the…
- 2016 Chevrolet Low Cab Forward 3500 and 3 other models — Affected vehicles have a throttle pedal that may get stuck…
Other campaigns involving Chevrolet vehicles
- 2025–2026 Chevrolet Express and 1 other model — Steering gear assembly may have a nut that was not properly…
- 2026 Chevrolet Express and 1 other model — Gear shifter may provide inaccurate gear selection feedback…
- 2018 Chevrolet Silverado 1500 and 5 other models — Left-side or right-side roof rail air bag (RRAB) inflator…
All Chevrolet Low Cab Forward 4500 recalls → · All Chevrolet recalls →
Source: NHTSA recall database, campaign 20V721000 (manufacturer number V2006). Data last verified Jul 30, 2026.