Service bulletins for the 2020 GMC Terrain
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
844 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
Only bulletins with component: Wiring and fuses are shown. Show all
| 21NA013 | 2022-05-31. Service bulletin. ELECTRICAL SYSTEM:WIRING; STRUCTURE:BODY:ROOF AND PILLARS. This technical bulletin provides repair information to correct a customer concern of a rattle or ticking noise heard coming from B-Pillar area. |
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| 19NA181 | 2022-05-31. Service bulletin. ENGINE; ELECTRICAL SYSTEM:WIRING. This technical bulletin provides a procedure to locate and repair the engine wiring harness. |
| PIT5748 | 2020-08-10. Service bulletin. EQUIPMENT:RECREATIONAL VEHICLE/TRAILER:120/240 VAC ELECTRICAL SYSTEM:WIRING; ELECTRICAL SYSTEM:WIRING. This preliminary information makes the technician aware of a trailer lighting concern if the incorrect harness is used to wire trailer. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.