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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 439 (SHIFT LOCK CONTROL SYSTEM)DESCRIPTION AND OPERATIONAUTOMATIC TRANSMISSION SHIFT LOCK CONTROL DESCRIPTION AND OPERATIONAUTOMATIC TRANSMISSION SHIFT LOCK CONTROL SYSTEM
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Automatic Transmission Shift Lock Control System

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Automatic Transmission Shift Lock Control System
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The automatic transmission shift lock control is a safety device that prevents an inadvertent shift out of PARK when the ignition is ON. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:

  • The automatic transmission shift lock control solenoid.
  • The automatic transmission shift lock control switch.
  • The park/neutral position switch.

With the ignition in the ON position, battery positive voltage is supplied to the park/neutral position switch. When the transmission is in the PARK position the contacts in the park/neutral position switch are closed. This allows current to flow through the switch to the automatic transmission shift lock control switch. The circuit continues through the normally-closed switch to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid is permanently grounded. This energizes the automatic transmission shift lock control solenoid, locking the shift linkage in the PARK position. When the driver presses the brake pedal the contacts in the automatic transmission shift lock control switch open, causing the automatic transmission shift lock control solenoid to release. This allows the shift lever to move from the PARK position.

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