K Yukon/Denali 4WD V8-6.5L DSL Turbo VIN S (1999)
Backup Lamp Switch: Adjustments
Automatic Transmission - 4L80-E
Adjustment Procedure
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Check the switch for proper operation.
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The engine must be in the P (Park) or N (Neutral) positions only. If adjustment is required, loosen the switch retaining bolts and rotate the switch
slightly.
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Tighten the bolts and check the switch for proper operation.
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Repeat the switch adjustment procedure until the engine starts when the shift lever is positioned in park and neutral.