Electronic Range Select (ERS) Mode
ERS or manual mode allows for the selection of the range of gear positions. Use this mode when driving down hill or towing a trailer to limit the top gear and vehicle speed.
To use this feature:
1. Move the shift lever to M(Manual Mode).
2. Press the plus/minus button on the shift lever, to increase or decrease the gear
range available.
See Manual Mode on page 9‑31 for more information.
See also:
Dual Tone Multi-Frequency (DTMF) Tones
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How OnStar Service Works
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Trailer Towing
Before pulling a trailer, there are three important considerations that have
to do with weight:
○ The weight of the trailer
○ The weight of the trailer tongue
○ The total weight ...





