• This update contains a required software change to help improve the overall software update and...
Chevrolet technical service bulletin 661.20 for 2026 Chevrolet Equinox and 2026 GMC Terrain.
- Bulletin number
- 661.20 (661.20)
- Component
- Unknown or other
- Summary
- • This update contains a required software change to help improve the overall software update and diagnostics process. Be sure to install this update to be able to receive future software updates. • Improves traction and stability control when accelerating or on uneven terrain. • Improves braking and stopping performance on low-traction surfaces. • Improves the performance of assisted braking features.
Vehicles covered
- Chevrolet Equinox 2026 2026
- GMC Terrain 2026 2026
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