Hummer H2. Manual - part 2465

2. Disconnect the oil cooler feed pipe at the radiator.  

3. Connect the J 35944-A discharge hose (1) to the oil cooler feed pipe, radiator end.  

4. Clip the discharge hose (1) onto the oil drain container.  

5. Start the engine with the transmission in PARK range and run for 30 seconds after fluid begins to 

flow from the discharge hose (1). A minimum of 1.9 L (2 qt) must be discharged during this 30 
second run time.  

7. If the amount of transmission fluid flow remains less than 1.9 L (2 qt) in 30 seconds, inspect the oil 

cooler feed pipe, bottom connector, for restrictions or damage. If no condition is found with the feed pipe, 
bottom connector, inspect the transmission.  

Clean-up 

1. Disconnect the water supply hose from the J 35944-A and bleed any remaining air pressure from the 

flusher tank.  

2. Remove the fill cap from the J 35944-A and return any unused flushing solution to its container. Rinse 

the J 35944-A with water. Do not store the J 35944-A with flushing solution in it.  

3. After every third use, clean the J 35944-A as described in the instructions included with the tool.  

4. Dispose of any waste water/solution and transmission fluid in accordance with local regulations.  

TRANSMISSION OVERHEATS 

Transmission Overheats 

OIL PRESSURE HIGH OR LOW 

Oil Pressure High or Low 

Checks

Causes

TCC Circuit

Blockage during apply or release

Pump Cover (215)

Cross channel leakage

Pressure Regulator Valve (216)

The valve is stuck in a high demand position

Oil Cooler

The cooler or the cooler lines are blocked

Oil Pan Gasket (73)

The gasket is damaged

Turbine Shaft O-ring (618)

The O-ring is damaged

Turbine Shaft Seals (619)

The seals are damaged

Stator Shaft Bushings (234/241)

The bushing is worn or damaged

Fluid

The fluid level is low

Radiator

Air flow is restricted or internal blockage

Checks

Causes

Oil Pump Assembly (4)

z

Pressure regulator valve stuck  

z

Pressure regulator valve spring  

z

Rotor guide omitted or misassembled  

 

2004 Hummer H2 

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

  

HARSH SHIFTS 

Harsh Shifts 

z

Rotor cracked or broken  

z

Reverse boost valve or sleeve stuck, damaged or 
incorrectly assembled  

z

Orifice hole in pressure regulator valve plugged  

z

Sticking slide or excessive rotor clearance  

z

Pressure relief ball not seated or damaged  

z

Porosity in pump cover or body  

z

Wrong pump cover  

z

Pump faces not flat  

z

Excessive rotor clearance  

Oil Filter (72)

z

Intake pipe restricted by casting flash  

z

Cracks in filter body or intake pipe  

z

O-ring seal missing, cut or damaged  

z

Wrong grease used on rebuild  

Control Valve Body (60)

z

Manual valve scored or damaged  

z

Spacer plate or gaskets incorrect, misassembled or 
damaged  

z

Face not flat  

z

2-3 Shift valve stuck  

z

Checkballs omitted or misassembled  

Pressure Control Solenoid (377)

Damage to electrical terminals

Transmission Fluid Pressure Manual Valve 
Position Switch (69)

z

Contamination  

z

Damaged seals  

Case (103)

Case to control valve body face not flat

System Voltage

z

12 volts not supplied to transmission  

z

Electrical short (pinched solenoid wire)  

z

Solenoid not grounded  

Checks

Causes

Throttle Position Sensor

Open or shorted circuit

Vehicle Speed Sensor (36)

Open or shorted circuit

Automatic Transmission Fluid Pressure (TFP) (69)

z

Contamination  

z

Damaged seals  

Trans Fluid Temperature Sensor (Part of 69)

Open or shorted circuit

Engine Coolant Temperature Sensor

Open or shorted circuit

 

2004 Hummer H2 

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

  

INACCURATE SHIFT POINTS 

Inaccurate Shift Points 

FIRST GEAR RANGE ONLY - NO UPSHIFT 

1st Gear Range Only - No Upshift 

Pressure Control Solenoid (377)

z

Damage to electrical terminals  

z

Contamination  

Checks

Causes

Oil Pump Assembly (4)

z

Stuck pressure regulator valve  

z

Sticking pump slide  

Valve Body Assembly (60)

Spacer plate or gaskets misassembled, damaged or incorrect

Case (103)

z

Porous or damaged valve body pad  

z

2-4 Servo Assembly 

{

2-4 accumulator porosity  

{

Damaged servo piston seals  

{

Apply pin damaged or improper length  

z

2-4 Band Assembly 

{

Burned  

{

Anchor pin not engaged  

Throttle Position Sensor

z

Disconnected  

z

Damage  

Vehicle Speed Sensor (36)

z

Disconnected  

z

Damaged  

z

Bolt not tightened  

4WD Low Switch

z

Disconnected  

z

Damaged  

Checks

Causes

Control Valve Body (60)

z

The 1-2 Shift valve is sticking  

z

The spacer plate or gaskets are mispositioned or damaged  

Case (103)

The case to valve body face is damaged or is not flat

Shift Solenoid Valves (366/368)

z

Stuck or damaged  

z

Faulty electrical connection  

2-4 Servo Assembly (13-28)

z

The apply passage case is restricted or blocked  

z

Nicks or burrs on the servo pin or on the pin bore in the case  

 

2004 Hummer H2 

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

  

SLIPS IN FIRST GEAR 

Slips in 1st Gear 

z

Fourth servo piston is installed backwards  

2-4 Band Assembly (602)

z

The 2-4 band is worn or damaged  

z

The band anchor pin is not engaged  

Checks

Causes

Forward Clutch Assembly (646-
651)

z

Clutch plates worn  

z

Porosity or damage in forward clutch piston  

z

Forward clutch piston inner and outer seals missing, cut or 
damaged  

z

Damaged forward clutch housing  

z

Forward clutch housing retainer and ball assembly not sealing 
or damaged  

Forward Clutch Accumulator 
(353-358)

z

Piston seal missing, cut or damaged  

z

Piston out of its bore  

z

Porosity in the piston or valve body  

z

Stuck abuse valve  

Input Housing and Shaft 
Assembly (621)

Turbine shaft seals missing, cut or damaged

Valve Body (60)

z

1-2 Accumulator valve stuck  

z

Face not flat, damaged lands or interconnected passages  

z

Spacer plate or gaskets incorrect, mispositioned or damaged  

Low Roller Clutch (678)

z

Damage to lugs to inner ramps  

z

Rollers not free moving  

z

Inadequate spring tension  

z

Damage to inner splines  

z

Lube passage plugged  

Torque Converter (1)

Stator roller clutch not holding

1-2 Accumulator Assembly (55-
57, 104)

z

Porosity in piston or 1-2 Accumulator cover and pin assembly  

z

Damaged ring grooves on piston  

z

Piston seal missing, cut or damaged  

z

Valve body to spacer plate gasket at 1-2 Accumulator cover, 
missing or damaged  

z

Leak between piston and pin  

z

Broken 1-2 Accumulator spring  

Line Pressure

Refer to Oil Pressure High or Low .

 

2004 Hummer H2 

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