Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn the ignition to LOCK/OFF in each shift lever position.
• The ignition should turn to LOCK/OFF only when the shift lever is in P (Park).
• The ignition key should come out only in LOCK/OFF.
Contact your dealer if service is required.
See also:
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OnStar Overview
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Tow/Haul Mode
(Tow/Haul): The vehicle may have a Tow/Haul mode.
The button is located on the instrument panel under the climate controls.
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