Gmc 2007 Sierra User Manual download pdf (Page 172)

100

101

If torque lock does occur, you may need to have

another vehicle push yours a little uphill to

take some of the pressure from the parking pawl

in the transmission, so you can pull the shift

lever out of PARK (P).

Shifting Out of Park (P)

(Automatic Transmission)

Your vehicle has an automatic transmission shift

lock control system which locks the shift lever

in PARK (P) when the ignition is in the LOCK

position. You have to fully apply your regular

brakes before you can shift from PARK (P) when

the ignition is in RUN. See Automatic Transmission

Operation on page 140 and “Torque Lock”

under Shifting Out of Park (P) (Automatic

Transmission) on page 172.

If your vehicle has an Allison Transmission

, the

transmission has a park pawl designed to hold the

higher weight of commercial medium duty

trucks. Therefore, the Allison Transmission

uses

larger parts than other automatic transmissions.

These larger parts may sometimes make a

clunking noise when the selector lever is moved

from DRIVE (D) or REVERSE (R) to PARK (P).

This is normal and there is no damage occurring

during these shifts.

If you cannot shift out of PARK (P), ease pressure

on the shift lever and push the shift lever all the

way up into PARK (P) as you maintain brake

application. Then, move the shift lever into

the gear you want.

If you ever hold the brake pedal down but still can

not shift out of PARK (P), try this:

1. Turn the key to ACCESSORY. There is no

shift interlock in this key position.

2. Apply and hold the brake until the end of

Step 4.

3. Shift the transmission to NEUTRAL (N).

4. Start the vehicle and then shift to the gear

you want.

5. Have the system ﬁxed as soon as you can.

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Gmc 2007 Sierra User Manual Page 172

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