Hummer H2. Manual - part 2645

Views or Automatic Transmission Related Connector End Views 
DEFINITION: Transmission shift lever will not move out of the PARK position with the ignition ON 
and the brake pedal pressed.

1

Did you perform the Symptoms - Automatic 
Transmission Shift Lock Control tests and all the 
necessary inspection?

Go to Step 2

Go to Symptoms - 

Automatic 

Transmission Shift 

Lock Control

2

1. Turn ON the ignition, with the engine OFF.  

2. Press and hold the brake pedal.  

3. Attempt to move the shift lever out of the 

PARK position.  

Does the shift lever move out of the PARK 
position?

Go to Testing for 

Intermittent 

Conditions and Poor 

Connections in Wiring 

Systems

Go to Step 3

3

1. Turn OFF the ignition.  

2. Disconnect the automatic transmission shift 

lock control switch.  

3. Turn ON the ignition, with the engine OFF.  

4. Press and hold the brake pedal.  

5. Attempt to move the transmission shift lever 

out of the PARK position.  

Does the transmission shift lever move out of the 
PARK position?

Go to Step 6

Go to Step 4

4

1. Turn OFF the ignition.  

2. Disconnect the automatic transmission shift 

lock control solenoid.  

3. Turn ON the ignition, with the engine OFF  

4. Press and hold the brake pedal.  

5. Attempt to move the transmission shift lever 

out of the PARK position.  

Does the transmission shift lever move out of the 
PARK position?

Go to Step 7

Go to Step 5

5

Inspect for poor connections at the harness 
connector of the automatic transmission shift lock 
control solenoid. 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 10

Go to Step 9

Inspect for poor connections at the harness 
connector of the automatic transmission shift lock 

 

2004 Hummer H2 

2004 TRANSMISSION Shift Lock Control - Hummer H2

  

SHIFT LEVER CAN BE MOVED WITHOUT BRAKE PEDAL DEPRESSED 

Shift Lever Can Be Moved without Brake Pedal Depressed 

6

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 10

Go to Step 8

7

Repair the short to battery positive voltage in the 
A/T 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 10

-

8

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 10

-

9

Replace the automatic transmission shift lock 
control solenoid. Refer to Automatic 
Transmission Shift Lock Actuator 
Replacement . 
Did you complete the replacement?

Go to Step 10

-

10

Operate the system in order to verify the repair. 
Did you find and correct the condition?

System OK

Go to Step 2

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 lever does not lock in the PARK position with the ignition ON and the 
brake pedal not pressed.

1

Did you perform the Symptoms - Automatic Transmission 
Shift Lock Control tests and all the necessary inspections?

Go to 

Step 2

Go to Symptoms - 

Automatic Transmission 

Shift Lock Control

2

1. Apply the parking brake and block the wheels.  

2. Turn ON, the ignition, with the engine OFF.  

3. Attempt to move the shift lever out of the PARK 

position.  

Does the shift lever move out of the PARK position?

Go to 

Step 3

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

3

1. Turn OFF the ignition.  

2. Ensure transmission shift lever is in the PARK 

position.  

3. Connect a test lamp between the A/T shift lock switch 

supply voltage circuit at the BTSI fuse and a good 

 

2004 Hummer H2 

2004 TRANSMISSION Shift Lock Control - Hummer H2

  

ground.  

4. Turn ON the ignition, with the engine OFF.  

Does the test lamp illuminate?

Go to 

Step 4

Go to Step 8

4

Connect a test lamp between the A/T shift lock switch 
supply voltage circuit at the automatic transmission shift 
lock control switch and a good ground. 
Does the test lamp illuminate?

Go to 

Step 5

Go to Step 14

5

1. Connect a test lamp between the A/T shift lock 

solenoid control circuit at the automatic transmission 
shift lock control switch and a good ground.  

2. Press and release the brake pedal several times.  

Does the test lamp turn ON and OFF with the brake pedal?

Go to 

Step 6

Go to Step 11

6

Connect a test lamp between the automatic transmission 
shift lock control solenoid supply voltage circuit at the 
automatic transmission shift lock control solenoid and a 
good ground. 
Does the test lamp illuminate?

Go to 

Step 7

Go to Step 15

7

Test the automatic transmission shift lock control solenoid 
ground circuit for an open or high resistance. Refer to 
Circuit Testing and Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to 

Step 20

Go to Step 12

8

1. Turn OFF the ignition  

2. Disconnect the park/neutral position switch connector. 

3. Connect a test lamp between the ignition 1 voltage 

circuit of the park/neutral position switch and a good 
ground.  

4. Turn ON the ignition, with the engine OFF.  

Does the test lamp illuminate?

Go to 

Step 9

Go to Step 13

9

1. Turn OFF the ignition  

2. Connect a 10 amp fused jumper between the ignition 

1 voltage circuit of the park/neutral position switch 
and the park/neutral position switch park signal circuit 
at the park/neutral position switch connector.  

3. Connect a test lamp between the A/T shift lock switch 

supply circuit at the BTSI fuse and a good ground.  

4. Turn ON the ignition, with the engine OFF.  

Does the test lamp illuminate?

Go to 

Step 10

Go to Step 16

1. Inspect for proper park/neutral position switch 

 

2004 Hummer H2 

2004 TRANSMISSION Shift Lock Control - Hummer H2

  

10

adjustment. Refer to Park/Neutral Position Switch 
Adjustment in Automatic Transmission 4L60-E.  

2. Inspect for poor connections at the harness connector 

of the park/neutral position 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 20

Go to Step 17

11

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 20

Go to Step 18

12

Inspect for poor connections at the harness connector 
automatic transmission shift lock control solenoid. 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 20

Go to Step 19

13

Repair the open or short in the ignition 1 voltage circuit of 
the park/neutral position switch. Refer to Circuit Testing 
and Wiring Repairs in Wiring Systems. 
Did you complete the repair?

Go to 

Step 20

-

14

Repair the open or short in the A/T shift lock switch supply 
voltage circuit. Refer to Circuit Testing and Wiring 
Repairs in Wiring Systems. 
Did you complete the repair?

Go to 

Step 20

-

15

Repair the open in the A/T 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 20

-

16

Repair the open or short in the park/neutral position switch 
park signal circuit. Refer to Circuit Testing and Wiring 
Repairs in Wiring Systems. 
Did you complete the repair?

Go to 

Step 20

-

17

Replace the park/neutral position switch. Refer to 
Park/Neutral Position Switch Replacement in Automatic 
Transmission 4L60-E. 
Did you complete the replacement?

Go to 

Step 20

-

18

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 20

-

19

Replace the automatic transmission shift lock control 
solenoid. Refer to Automatic Transmission Shift Lock 
Actuator Replacement . 

Go to 

 

2004 Hummer H2 

2004 TRANSMISSION Shift Lock Control - Hummer H2