November 20, 2020 NHTSA CAMPAIGN NUMBER: 20V721000
Chassis Harness/Coolant Return Hose Could Chafe
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.
NHTSA Campaign Number: 20V721
Manufacturer Isuzu Technical Center of America, Inc.
Components ENGINE AND ENGINE COOLING, ELECTRICAL SYSTEM
Potential Number of Units Affected 46
Summary
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.
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.
Check if your Isuzu Truck has a Recall
CONDITION
Isuzu Motors Limited has decided that a defect, which relates to motor vehicle safety, exists in certain 2020MY N-Series crew cab vehicles with gasoline engines 6.6 L8T. In the affected vehicles, the chassis harness and the coolant return hose from the radiator to the reservoir (surge hose) are located near the edge of the cab floor panel. During normal driving, the harness and/or hose could potentially chafe from contact with the cab floor panel. 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. Leaking engine coolant and/or a damaged wire harness may result in a no-start condition, engine stall, or thermal event, increasing the risk of a crash or fire.
CORRECTION
Isuzu dealers will install additional retention parts and an edge protector to ensure adequate clearance and protection. This service will be performed free of charge.
PARTS
| Part Number | Description | Quantity |
| 5-09707-030-1 | Cable Water, Hose, Harness Band | 1 |
| 5-09700-321-0 | Frame Harness Clip | 1 |
| 8-97327-172-0 | Protector | 1 |
SERVICE PROCEDURE
1. Shift vehicle to park, turn off engine, set parking brake, and block rear wheels.
2. Remove the rear engine cover. (See Figure 1.) The work will be performed in the area indicated.
3. On the driver’s side of the area exposed by the removal of the rear engine cover, locate where the coolant overflow surge hose is attached to the bracket with a band clamp just above the two harness connectors. (See Figure 2.)
4. Use your fingers to depress the two tabs (See Figure 3) on the clip attaching the coolant surge hose band clamp clip on the back side of the bracket. Disengage the clip from the bracket.
NOTE: Do NOT remove the band clamp from around the coolant surge hose.
5. Relocate the coolant surge hose to behind the bracket and rotate the band clamp to install the clip into same hole in the bracket, but from the back side. (See Figure 4.) Ensure that both tabs on the band clamp clip fully engage into the bracket.
6. Push the new protector onto the rear of the bracket between the two connectors as shown in Figure 5.
7. Route the harness going to the black connector as shown in Figure 6 and install the new frame harness clip in the hole of the cab mount bracket to secure the harness. Bend the tabs of the new frame harness clip outward on the back side of the cab mounting bracket. (See Figure 7.)
8. Locate the one existing frame harness clip securing the coolant surge hose to the body mount bracket. (See Figure 8.) Relocate the coolant surge hose and the frame harness clip to the new location as shown in Figures 8 and 9. Ensure that both tabs are properly bent outwards on the back side of the body mounting bracket.
9. Use the new harness band to secure the surge hose to the harness just below the newly added frame harness clip. (See Figure 10.)
10. Install the rear engine cover.
STOP SALE AND DELIVERY – SAFETY RECALL
Date: November 20, 2020
Subject: Stop Sale and Delivery for Upcoming Safety Recall
Affected Models:
- Certain 2020MY N-Series Crew Cab Vehicles with Gasoline Engines 6.6 L8T
To: Isuzu Dealer Principal, Sales Manager and Service Manager
Effective immediately, stop the sale and delivery of affected vehicles in your inventory, even if a customer has purchased an affected vehicle. We are in the process of taking steps to address a safety related defect in these vehicles. Federal law prohibits the sale and delivery to customers of any vehicle containing a safety defect. You must not deliver any covered vehicles to customers until after the vehicle has been remedied.
WHAT IS THE CONDITION
Isuzu Motors Limited has decided that a defect, which relates to motor vehicle safety, exists in certain 2020MY N-Series crew cab vehicles with gasoline engines 6.6 L8T. In the affected vehicles, the chassis harness and the coolant return hose from the radiator to the reservoir (surge hose) are located near the edge of the cab floor panel. During normal driving, the harness and/or hose could potentially chafe from contact with the cab floor panel. 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. Leaking engine coolant and/or a damaged wire harness may result in a no-start condition, engine stall, or thermal event, increasing the risk of a crash or fire.
WHAT WE WILL DO
Isuzu Commercial Truck of America, Inc. has issued this notice and, if applicable, an affected inventory report (approximately 24 vehicles are in dealer inventory). On Monday, November 23, 2020, dealers with affected vehicles will be force-shipped an initial quantity of remedy parts and the campaign bulletin will be published.
WHAT YOU SHOULD DO
After confirming there are affected vehicles in your dealer’s inventory, using the Isuzu Vehicle Information System (IVIS), open a repair order referencing this Stop Sale for each affected NEW vehicle in your inventory and hold the vehicle until the campaign bulletin is released.
IMPORTANT: Always confirm vehicle eligibility prior to beginning repairs by using the Isuzu Vehicle Information System (IVIS).
You will receive information about owner notification in the near future.
We regret any inconvenience this action may cause you.
Sincerely,
Isuzu Commercial Truck of America, Inc.
Isuzu Commercial Truck of America, Inc.
Customer Relations Department
1400 S. Douglass Road, Suite 100, Anaheim, CA 92806 *1-866-441-9638
DOC ID: SS_V2006_20201120
2 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | LOW CAB FORWARD 4500 | 2020 |
| ISUZU | NPR HD | 2020 |
11 Associated Documents
Owner Notification Letter(Part 577)
RCONL-20V721-6963.pdf 225.589KB
RCONL-20V721-6963
Manufacturer Notices(to Dealers,etc)
RCMN-20V721-8757
Manufacturer Notices(to Dealers,etc)
RCMN-20V721-3631.pdf 111.371KB
RCMN-20V721-3631
Recall Acknowledgement
RCAK-20V721-9308.pdf 244.857KB
Recall 573 Report
RCLRPT-20V721-3731.PDF 216.838KB
RCLRPT-20V721-3731
Recall Quarterly Report #1, 2020-4
RCLQRT-20V721-1358.PDF 211.155KB
Manufacturer Notices(to Dealers,etc)
RCMN-20V721-6394.pdf 106.827KB
RCMN-20V721-6394
Remedy Instructions and TSB
RCRIT-20V721-3739.pdf 2854.154KB
RCRIT-20V721-3739
Recall Quarterly Report #2, 2021-1
RCLQRT-20V721-6720.PDF 211.255KB
RCLQRT-20V721-6720
Recall Quarterly Report #3, 2021-2
RCLQRT-20V721-4345.PDF 211.336KB
RCLQRT-20V721-4345
Recall Quarterly Report #4, 2021-3
RCLQRT-20V721-8064.PDF 211.442KB
RCLQRT-20V721-8064
Latest Recalls Documents
https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=20V721&docType=RCL
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