GMC Yukon Denali 2006 Manual page 437

Automatic Transmission Shift Lock
Control System Check
CAUTION:
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When you are doing this inspection, the
vehicle could move suddenly. If the vehicle
moves, you or others could be injured.
1. Before you start, be sure you have enough room
around the vehicle. It should be parked on a level
surface.
2. Firmly apply the parking brake. See Parking Brake
on page 2-24.
Be ready to apply the regular brake immediately if
the vehicle begins to move.
3. With the engine off, turn the ignition to RUN, but do
not start the engine. Without applying the regular
brake, try to move the shift lever out of PARK (P)
with normal effort. If the shift lever moves out
of PARK (P), contact your GM Goodwrench
for service.
Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn
the ignition to LOCK in each shift lever position.
•
The ignition should turn to LOCK only when the
shift lever is in PARK (P).
•
The key should come out only in LOCK.
Contact your GM Goodwrench
required.
®
dealer
®
dealer if service is
6-11