Technical Service Bulletin 20NA139 — 2018 GMC SIERRA 2500
ELECTRICAL SYSTEM
Bulletin Details
| TSB ID | 20NA139 |
| Manufacturer | |
| Vehicle | 2018 GMC SIERRA 2500 |
| Component | ELECTRICAL SYSTEM |
| Communication Date |
Bulletin Summary
This technical bulletin provides a procedure to check and tighten the B+ at the starter for proper torque.
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.