Technical Service Bulletin 21-NA-115 — 2021 CHEVROLET 4500HD
ENGINE AND ENGINE COOLING
Bulletin Details
| TSB ID | 21-NA-115 |
| Manufacturer | |
| Vehicle | 2021 CHEVROLET 4500HD |
| Component | ENGINE AND ENGINE COOLING |
| Communication Date |
Bulletin Summary
This informational bulletin provides information for dealers/technicians on Available ECM Calibration to Activate High Idle Mode for Fleet Vehicles.
About Technical Service Bulletins
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.