Hummer H2. Manual - part 2377

A condition where the engine friction is used to slow the vehicle by manually downshifting during a zero 
throttle coastdown. 

Full Throttle Detent Downshift  

A quick apply of the accelerator pedal to its full travel, forcing a downshift. 

Heavy Throttle  

Approximately 3/4 of accelerator pedal travel (75 percent throttle position). 

Light Throttle  

Approximately 1/4 of accelerator pedal travel (25 percent throttle position). 

Medium Throttle  

Approximately 1/2 of accelerator pedal travel (50 percent throttle position). 

Minimum Throttle  

The least amount of throttle opening required for an upshift. 

Wide Open Throttle (WOT)  

Full travel of the accelerator pedal (100 percent throttle position). 

Zero Throttle Coastdown  

A full release of the accelerator pedal while the vehicle is in motion and in drive range. 

Shift Condition Definitions 

Bump  

A sudden and forceful apply of a clutch or a band. 

Chuggle  

A bucking or jerking. This condition may be most noticeable when the converter clutch is engaged. It is 
similar to the feel of towing a trailer. 

Delayed  

A condition where a shift is expected but does not occur for a period of time. This could be described as a 
clutch or band engagement that does not occur as quickly as expected during a part throttle or wide open 

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E (Introduction) - Hummer H2

  

throttle apply of the accelerator, or during manual downshifting to a lower range. This term is also 
defined as LATE or EXTENDED. 

Double Bump (Double Feel)  

Two sudden and forceful applies of a clutch or a band. 

Early  

A condition where the shift occurs before the car has reached proper speed. This condition tends to labor 
the engine after the upshift. 

End Bump  

A firmer feel at the end of a shift than at the start of the shift. This is also defined as END FEEL or SLIP 
BUMP. 

Firm  

A noticeably quick apply of a clutch or band that is considered normal with a medium to heavy throttle. 
This apply should not be confused with HARSH or ROUGH. 

Flare  

A quick increase in engine RPM along with a momentary loss of torque. This most generally occurs 
during a shift. This condition is also defined as SLIPPING. 

Harsh (Rough)  

A more noticeable apply of a clutch or band than FIRM. This condition is considered undesirable at any 
throttle position. 

Hunting  

A repeating quick series of upshifts and downshifts that causes a noticeable change in engine RPM, such 
as a 4-3-4 shift pattern. This condition is also defined as BUSYNESS. 

Initial Feel  

A distinctly firmer feel at the start of a shift than at the finish of the shift. 

Late  

A shift that occurs when the engine RPM is higher than normal for a given amount of throttle. 

Shudder  

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E (Introduction) - Hummer H2

  

A repeating jerking condition similar to CHUGGLE but more severe and rapid. This condition may be 
most noticeable during certain ranges of vehicle speed. 

Slipping  

A noticeable increase in engine RPM without a vehicle speed increase. A slip usually occurs during or 
after initial clutch or band apply. 

Soft  

A slow, almost unnoticeable clutch or band apply with very little shift feel. 

Surge  

A repeating engine related condition of acceleration and deceleration that is less intense than CHUGGLE.

Tie-Up  

A condition where two opposing clutch and/or bands are attempting to apply at the same time causing the 
engine to labor with a noticeable loss of engine RPM. 

Noise Conditions 

Drive Link Noise  

A whine or growl that increases or fades with vehicle speed, and is most noticeable under a light throttle 
acceleration. It may also be noticeable in PARK or NEUTRAL operating ranges with the vehicle 
stationary. 

Final Drive Noise  

A hum related to vehicle speed which is most noticeable under a light throttle acceleration. 

Planetary Gear Noise  

A whine related to vehicle speed, which is most noticeable in FIRST gear, SECOND gear, FOURTH gear 
or REVERSE. The condition may become less noticeable, or go away, after an upshift. 

Pump Noise  

A high pitched whine that increases in intensity with engine RPM. This condition may also be noticeable 
in all operating ranges with the vehicle stationary or moving. 

Torque Converter Noise  

A whine usually noticed when a vehicle is stopped, and the transmission is in DRIVE or REVERSE. The 

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E (Introduction) - Hummer H2

  

noise will increase with engine RPM.

Transmission Abbreviations 

A/C  

Air Conditioning 

AC  

Alternating Current 

AT  

Automatic Transmission 

CCDIC  

Climate Control Driver Information Center 

DC  

Direct Current 

DIC  

Driver Information Center 

DLC  

Diagnostic Link Connector 

DMM  

Digital Multimeter 

DTC  

Diagnostic Trouble Code 

ECT  

Engine Coolant Temperature 

EMI  

 

2004 Hummer H2 

2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E (Introduction) - Hummer H2