Hummer H2. Manual - part 2452

3

Is the fluid a light brown in color?

Fluid may turn a dark brown in color from normal use. This does not always 
indicate an oxidation or a contamination issue.

Go to 

Step 5

Go to 

Step 4

4

Is the fluid black in color and or have a "burnt" smell?

Go to 

Step 14

Go to 

Step 5

5

Does the fluid appear as a solid "liquid" and not "foamy" or full of bubbles on 
level indicator?

Go to 

Step 6

Go to 

Step 6

6

Check the fluid level. Proper level should be in middle of the "X" pattern, on 
level indicator. 
Is the level OK?

Go to 

Step 19

Go to 

Step 7

7

Is the fluid level high on indicator?

Go to 

Step 12

Go to 

Step 8

8

Is the fluid level low on indicator?

Go to 

Step 9

Go to 

Step 4

9

Check for any external leak or leaks. Refer to Fluid Leak Diagnosis . 
Did you find an external leak or leaks?

Go to 

Step 10

Go to 

Step 11

10

Correct leak or leaks as needed. Are any leak or leaks still present?

Go to 

Step 9

Go to 

Step 11

11

Add fluid until level is in middle of "X" pattern on the level indicator. 
Is the level OK?

Go to 

Step 19

Go to 

Step 6

12

Drain fluid until level is in middle of "X" pattern on the level indicator. 
Is level OK?

Go to 

Step 19

Go to 

Step 6

13

Replace oil cooler and flush lines. 
Is the replacement complete?

Go to 

Step 15

-

14

Drain fluid and remove oil pan to inspect.Is there sign or signs of internal 
component damage noted in bottom of transmission oil pan?

IMPORTANT:

A small amount of "friction" material in pan bottom is a "normal" condition, 
but large pieces and or metal particles will require complete transmission 
overhaul.

Go to 

Step 16

Go to 

Step 13

15

Replace the filter and fluid. Refer to Automatic Transmission Fluid/Filter 
Replacement . 
Is the replacement complete?

Go to 

Step 6

-

16

Flush oil cooler and lines. Refer to Automatic Transmission Oil Cooler 
Flushing and Flow Test (J 45096) or Automatic Transmission Oil Cooler 
Flushing and Flow Test (J 35944-A) . 
Is the Automatic Transmission Oil Cooler Flushing and Flow Test complete?

Go to 

Step 17

-

17

Overhaul the transmission. 
Is the Transmission Overhaul Procedure complete?

Go to 

Step 18

-

18

Add new fluid. 
Is the procedure complete?

Go to 

Step 6

-

19 Check the fluid level and correct as necessary. 

Go to 

-

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

LINE PRESSURE CHECK PROCEDURE 

Fig. 3: J 21867 Pressure Gauge 
Courtesy of GENERAL MOTORS CORP. 

Tools Required 

J 21867 Pressure Gauge 

1. Install a scan tool.  

2. Start the engine.  

Is the fluid level satisfactory?

Step 20

20

If equipped, reset the oil life monitor to 100 percent. 
Are all of the reset procedures complete?

System 

OK

Go to 

Step 1

CAUTION: Keep the brakes applied at all times in order to prevent unexpected 

vehicle motion. Personal injury may result if the vehicle moves 
unexpectedly.

IMPORTANT: Before performing the line pressure check, verify that the transmission 

pressure control (PC) solenoid is operating correctly.

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

3. Inspect the transmission for the proper fluid levels. Refer to Transmission Fluid Checking Procedure .  

4. Use the scan tool to inspect for any active or stored diagnostic trouble codes.  

5. Inspect the manual linkage at the transmission for proper function.  

6. Turn the engine OFF. 

7. Remove the pressure plug.  

8. Install the J 21867 .  

9. Access the Scan Tool Output Control for the PC Solenoid.  

10. Start the engine. 

11. Begin commanding PC Solenoid at 1.0 amp and lower the amperage in one-tenth increments (0.01) until 

maximum line pressure is achieved.  

12. Allow the pressure to stabilize between increments.  

13. Compare your pressure readings to the Line Pressure table. Refer to Line Pressure .  

14. If the pressure readings vary greatly from the line pressure table, refer to Oil Pressure High or Low .  

15. Turn the engine OFF.  

16. Remove the J 21867 . 

17. Install the pressure plug. 

Tighten: Tighten the pressure plug to 8-14 N.m (6-10 lb ft). 

ROAD TEST PROCEDURE 

The following test provides a method of evaluating the condition of the automatic transmission. The test is 
structured so that most driving conditions would be achieved. The test is divided into the following parts:

IMPORTANT: It may be necessary to remove or disconnect components in order to gain 

access to the transmission line pressure test port/plug.

IMPORTANT: In order to achieve accurate line pressure readings, the following 

procedure must be performed at least three times in order to gather 
uniform pressure readings. 
The scan tool is only able to control the PC solenoid in PARK and 
NEUTRAL with engine speeds below 1500 RPM. This protects the clutches 
from extreme high or low line pressures.

NOTE:

Refer to Fastener Notice in Cautions and Notices.

IMPORTANT: The Road Test Procedure should be performed only as part of the Symptom 

Diagnosis. Refer to Symptoms - Automatic Transmission .

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)

  

z

Electrical Function Check  

z

Upshift Control and Torque Converter Clutch (TCC) Apply  

z

Part Throttle Detent Downshifts  

z

Full Throttle Detent Downshifts  

z

Manual Downshifts  

z

Coasting Downshifts  

z

Manual Gear Range Selection 

{

REVERSE  

{

Manual FIRST  

{

Manual SECOND  

{

Manual THIRD  

Before the road test, ensure the following: 

z

The engine is performing properly.  

z

Transmission fluid level is correct. Refer to the Transmission Fluid Checking Procedure .  

z

Tire pressure is correct.  

During the road test: 

z

Perform the test only when traffic conditions permit.  

z

Operate the vehicle in a controlled, safe manner.  

z

Observe all traffic regulations.  

z

View the scan tool data while conducting this test. 

Take along qualified help in order to operate the vehicle safely. 

z

Observe any unusual sounds or smells.  

After the road test, check the following: 

z

Transmission fluid level. Refer to the Transmission Fluid Checking Procedure .  

z

Diagnostic trouble codes (DTCs) that may have set during the testing. Refer to the applicable DTC.  

z

Scan tool data for any abnormal readings or data.  

Electrical Function Check 

Perform this check first, in order to ensure the electronic transmission components are connected and 
functioning properly. If these components are not checked, a simple electrical condition could be mis-

IMPORTANT: Complete the test in the sequence given. Incomplete testing cannot guarantee 

an accurate evaluation.

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transaxle - 4L60-E/4L65-E (Troubleshooting)