Hummer H2. Manual - part 2466

SLIPPING OR HARSH 1-2 SHIFT 

Slipping or Rough 1-2 Shift 

NO 2-3 SHIFT OR 2-3 SHIFT SLIPS, ROUGH OR HUNTING 

No 2-3 Shift or 2-3 Shift slipping, Rough or Hunting 

2-4 Servo Assembly (13-28)

4th Servo piston in backward

Checks

Causes

Valve Body Assembly (60)

z

Mislocated valve body to spacer plate checkball or 
checkballs.  

z

1-2 Shift valve train stuck due to sediment  

z

Gaskets or spacer plate incorrect, mispositioned or damaged 

z

1-2 Accumulator valve stuck or damaged  

z

Face not flat  

z

4-3 sequence valve stuck or damaged  

z

#1 or #8 checkball missing or mis-located  

z

1-2 accumulator valve bushing rotated 180°  

2-4 Servo Assembly (13-28)

z

Apply pin too long or too short  

z

2nd servo apply piston seal missing, cut or damaged  

z

Restricted or missing oil passages  

z

Servo bore in case damaged  

2nd Accumulator (55-57, 104)

z

Porosity in 1-2 accumulator cover or piston  

z

Piston seal or groove damaged  

z

Nicks or burrs in 1-2 accumulator housing  

z

Missing or restricted oil passage  

z

1-2 accumulator piston spring not seated  

z

Rough finish in 1-2 accumulator bore in case  

z

A cracked 1-2 accumulator piston - allowing fluid to leak by 

2-4 Band (602)

Worn or mispositioned

Oil Pump Assembly (4) or Case 
(103)

Faces not flat

Checks

Causes

Oil Pump (4)

Stator shaft bushings scored or off location

Valve Body Assembly (60)

z

2-3 Shift valve train stuck  

z

Gaskets or spacer plate incorrect, mispositioned or 
damaged  

z

2-3 Accumulator valve stuck  

 

2004 Hummer H2 

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

  

SECOND/THIRD GEAR ONLY OR FIRST/FOURTH GEARS ONLY 

Second/Third Gears Only or First/Fourth Gears Only 

NO FIRST OR SECOND GEAR/NO THIRD OR FOURTH GEAR 

No 1st or 2nd/No 3rd or 4th 

NO SECOND GEAR, NO FOURTH GEAR, AND NO REVERSE GEAR 

No Second Gear, No Fourth Gear and No Reverse Gear 

z

Face not flat  

z

Chips in servo feed oil, orifice #7 in spacer plate  

z

Mislocated valve body to spacer plate checkball or 
checkballs  

Input Housing Assembly (620-621, 646-
655)

z

3-4 clutch or forward clutch plates worn  

z

Excessive clutch plate travel  

z

Cut or damaged 3-4 clutch or forward clutch piston 
seals  

z

Porosity in input clutch housing or piston  

z

3-4 clutch piston checkball stuck, damaged or not 
sealing  

z

Restricted apply passages  

z

Forward clutch piston retainer and ball assembly not 
seating  

z

Sealing balls loose or missing  

z

Input housing (621) cracked or broken  

Case (103)

3rd accumulator retainer and ball assembly not seating

2-4 Servo Assembly (13-28)

2nd apply piston seals missing, cut or damaged

Checks

Causes

1-2 Shift Solenoid Valve (367A)

z

Sediment is in the valves  

z

The electrical connection is faulty  

z

Damaged seal  

Checks

Causes

2-3 Shift Solenoid Valve (367B)

z

Sediment is in the valves  

z

The electrical connection is faulty  

z

Damaged seal  

Checks

Causes

Reaction Sun Shell (670)

Broken spline on reaction sun shell/replace shell.

 

2004 Hummer H2 

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

  

THIRD GEAR ONLY 

Third Gear Only 

3-2 FLARE OR TIE-UP 

3-2 Flare or Tie-Up 

NO 3-4 SHIFT, SLIPS OR ROUGH 3-4 SHIFT 

No 3-4 Shift/Slipping or Rough 3-4 Shift 

Checks

Causes

System Voltage

z

12 volts not supplied to transmission  

z

Electrical short (pinched solenoid wire)  

z

Solenoid not grounded  

Checks

Causes

3-2 Shift Solenoid Valve Assembly (394)

z

Shorted or damaged  

z

Contamination  

z

Damaged Seal  

z

Check ball not seating  

Checks

Causes

Oil Pump Assembly (4)

z

Pump cover retainer and ball assembly omitted or damaged  

z

Faces not flat  

Valve Body Assembly (60)

z

Valves stuck 

{

2-3 Shift valve train  

{

Accumulator valve  

{

1-2 Shift valve train  

{

3-2 Shift solenoid valve assembly  

z

Spacer plate or gaskets incorrect, mispositioned or damaged  

2-4 Servo Assembly (13-28)

z

Incorrect band apply pin  

z

Missing or damaged servo seals  

z

Porosity in piston, cover or case  

z

Damaged piston seal grooves  

z

Plugged or missing orifice cup plug  

Case (103)

z

3rd Accumulator retainer and ball assembly leaking  

z

Porosity in 3-4 accumulator piston or bore  

z

3-4 Accumulator piston seal or seal grooves damaged  

z

Plugged or missing orifice cup plug  

 

2004 Hummer H2 

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

  

NO REVERSE OR SLIPS IN REVERSE 

No Reverse or Slips in Reverse 

NO PART THROTTLE OR DELAYED DOWNSHIFTS 

No Part Throttle or Delayed Downshifts 

z

Restricted oil passage  

Input Housing Assembly (621)

Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting .

2-4 Band Assembly (602)

Worn or misassembled

Checks

Causes

Input Housing Assembly (602)

z

3-4 Apply ring stuck in applied position  

z

Forward clutch not releasing  

z

Turbine shaft seals missing, cut or damaged  

Manual Valve Link (89)

Disconnected

Valve Body Assembly (60)

z

2-3 Shift valve stuck  

z

Manual linkage not adjusted  

z

Spacer plate and gaskets incorrect, mispositioned or 
damaged  

z

Lo overrun valve stuck  

z

Orificed cup plug restricted, missing or damaged  

Reverse Input Clutch Assembly (605-
614)

z

Clutch plate worn  

z

Reverse input housing and drum assembly cracked at 
weld  

z

Clutch plate retaining ring out of groove  

z

Return spring assembly retaining ring out of groove  

z

Seals cut or damaged  

z

Restricted apply passage  

z

Porosity in piston  

z

Belleville plate installed incorrectly  

z

Excessive clutch plate travel  

z

Oversized housing  

Lo and Reverse Clutch (694-696)

z

Clutch plates worn  

z

Porosity in piston  

z

Seals damaged  

z

Return spring assembly retaining ring mispositioned  

z

Restricted apply passage  

Reaction Sun Shell (670)

Broken spline on reaction sun shell/replace shell

 

2004 Hummer H2 

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