Shift Lever Can Be Moved without Brake Pedal Depressed

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Automatic Transmission Shift Lock Control Schematics Connector End View Reference: Automatic Transmission Shift Lock Control Connector End Views or Automatic Transmission Related Connector End Views DEFINITION: Transmission shift lock does not lock in the PARK position with the ignition ON and the brake pedal not press or with the ignition OFF.
1	Did you perform the Symptoms- Automatic Transmission Shift Lock Control tests and necessary inspections?	Go to Step 2	Go to Symptoms - Automatic Transmission Shift Lock Control
2	Turn ON the ignition, with the engine OFF. Apply the parking brakes and block the wheels. Attempt to move the shift lever out of the PARK position without pressing the brake pedal. Does the shift lever move out of the PARK position?	Go to Step 3	Go to Testing for Intermittent Conditions and Poor Connections
3	Turn OFF the ignition. Press and hold the brake pedal. Attempt to move the shift lever out of the PARK position. Does the shift lever move out of the PARK position?	Go to Step 4	Go to Step 5
4	Test for a short to battery positive voltage in the ignition 1 circuit of the park lock solenoid. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 14	Go to Step 8
5	Connect a test lamp between the automatic transmission shift lock control switch ignition 1 voltage circuit and a good ground. Turn ON the ignition, with the engine OFF Does the test lamp illuminate?	Go to Step 6	Go to Step 11
6	Turn OFF the ignition. Connect a test lamp between the A/T shift lock control solenoid supply voltage circuit at the automatic transmission shift lock control switch and a good ground. Turn ON the ignition, with the engine OFF. Press and release the brake pedal several times. Does the test lamp turn ON and OFF with the brake pedal?	Go to Step 7	Go to Step 9
7	Turn OFF the ignition. Connect a test lamp between the A/T shift lock control solenoid supply voltage circuit at the automatic transmission shift lock control solenoid and a good ground. Turn ON the ignition, with the engine OFF. Press and release the brake pedal several times. Does the test lamp turn ON and OFF with the brake pedal?	Go to Step 8	Go to Step 10
8	Inspect for poor connections at the harness connector of the automatic transmission shift lock control and park lock solenoids. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 14	Go to Step 13
9	Inspect for poor connections at the harness connector of the automatic transmission shift lock control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 14	Go to Step 12
10	Repair the open in the automatic transmission shift lock control solenoid supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 14	-
11	Repair the open in the automatic transmission shift lock control switch ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 14	-
12	Replace the automatic transmission shift lock control switch. Refer to Stop Lamp Switch Replacement in Lighting Systems. Did you complete the replacement?	Go to Step 14	-
13	Replace the automatic shift lock control/park lock solenoids. Refer to Floor Shift Control Replacement in Automatic Transaxle 4L60-E. Did you complete the replacement?	Go to Step 14	-
14	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2