Hummer Forums by Elcova - TSB - Popping/Snapping Noise When Vehicle is Hot

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<TD align=middle width="50%">Document ID# 1582162
2003 HUMMER
H2 </TD>
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<H1>Popping/Snapping Noise When Vehicle is Hot, at Idle or Immediately After
Vehicle is Shut Off (Replace Muffler Heat Shield) #03-06-05-008B - (Jan 13,
2005)</H1></TABLE>Popping/Snapping Noise When Vehicle is Hot, at Idle or
Immediately After Vehicle is Shut Off (Replace Muffler Heat Shield)

2002-2005 Cadillac Escalade, Escalade EXT</P>

2003-2005 Cadillac Escalade ESV</P>

2002-2005 Chevrolet Avalanche, Suburban, Tahoe</P>

2002-2005 GMC Yukon, Yukon Denali, Yukon Denali XL</P>

2003-2005 HUMMER H2</P>

with 4.8L, 5.3L or 6.0L Gasoline Engine (VINs N, U, T, V, Z
-- RPOs LQ9, LQ4, LM7, LR4, L59) </P>

This Bulletin DOES NOT APPLY 8.1L vehicles at this time.</P>

This bulletin is being revised to include additional models and parts
availability. Please discard Advanced Service Information Bulletin
Number03-06-05-008A (Section 06 -- Engine/Propulsion System).</P><A
name=ss1-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc=sm#ss1-1582162">
<H5>Condition</A></H5>

Some customers may comment on a popping/snapping noise from underneath the
vehicle at idle or immediately after the vehicle is shut off. Some
popping/snapping noise from the exhaust system during cool down is a normal
condition.</P>

The noise may be intermittent depending on the outside temperature and or
temperature of the exhaust system at the time of testing.</P><A
name=ss2-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc=sm#ss2-1582162">
<H5>Cause</A></H5>

As the exhaust system warms and cools, the muffler and the muffler heat
shield expand and contract at different rates and may cause a popping and/or
snapping noise. </P>

Some popping/snapping noise from the exhaust system during cool down is a
normal condition. The customer should be made aware that this service procedure
is designed to reduce but not eliminate all exhaust system popping and snapping
during cool down.</P><A name=ss3-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc=sm#ss3-1582162">
<H5>Correction</A></H5>
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TH vAlign=bottom align=middle>

DO THIS</P></TH>
<TH vAlign=bottom align=middle>

DON'T DO THIS</P></TH></TR>
<TR>
<TD vAlign=center align=middle>

Install a new heat shield and straps on the existing muffler.</P></TD>
<TD vAlign=center align=middle>

DO NOT replace exhaust system components other than the muffler heat
shield. </P></TD></TR></TBODY></TABLE>

Follow the service procedure below to correct this condition.</P>

<FONT color=brown>Important:Some popping/snapping noise from the
exhaust system during cool down is a normal condition. The customer should be
made aware that this service procedure is designed to reduce but not eliminate
all exhaust system popping and snapping during cool down.
</FONT></P>

<LI type=1>Raise and support the vehicle. Refer to Lifting and Jacking the
Vehicle in General Information (SI Document ID #737171).

<FONT color=red>Caution:
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT color=red
size=4>•</FONT></TD>
<TD vAlign=top><FONT color=red>In order to avoid being burned, do not
service the exhaust system while it is still hot. Service the system
when it is cool. </FONT></TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT color=red
size=4>•</FONT></TD>
<TD vAlign=top><FONT color=red>Always wear protective goggles and gloves
when removing exhaust parts as falling rust and sharp edges could result
in serious personal injury. </FONT></TD></TR></TBODY></TABLE></DIV></FONT>

</P>
<LI type=1>Remove the nuts securing the muffler to the catalytic converter.
<LI type=1>On 6.0L equipped vehicles only, loosen the exhaust pipe
clamp.

<FONT color=brown>Important:Do not use oil base lubricants on
the rubber exhaust hangers.
</FONT></P>
<LI type=1>Apply a soapy solution to the exhaust pipe hanger rods in order to
ease the removal of the exhaust hangers.
<LI type=1>Pry the exhaust hangers free from the exhaust pipe hanger rods.

<FONT color=brown>Important:It is not necessary to remove the
muffler from the vehicle to replace the muffler heat shield.
</FONT></P>
<LI type=1>Reposition the muffler to gain access to the muffler heat shield.

<FONT color=blue>Notice:Use extreme caution not to damage the
muffler when removing the heat shield from the muffler.</FONT></P>
<LI type=1>Using an air-powered hack saw blade, or equivalent, cut off the
existing muffler heat shield just as the heat shield rises off of the muffler.
See the illustration above.
<LI type=1>Remove the heat shield from the muffler.
<LI type=1>Hammer flush the remaining heat shield to the muffler.

<FONT color=brown>Important:
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT color=brown
size=4>•</FONT></TD>
<TD vAlign=top><FONT color=brown>The new heat shield should not come in
contact with the remaining muffler heat shield.
</FONT></TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT color=brown
size=4>•</FONT></TD>
<TD vAlign=top><FONT color=brown>The new heat shield should not come in
contact with the horizontal lock seam on the muffler.
</FONT></TD></TR></TBODY></TABLE></DIV></FONT>

</P>
<LI type=1>Install the new heat shield, P/N10393433, onto the muffler as
shown above.

<LI type=1>Install three straps, P/N10391259, so that the strap screw
head will be located on top of the muffler.

Tighten
Tighten the strap screw to 4N·m
(35lbin). </P>

<LI type=1>Cut off the excess strap material and bend the strap over the strap
screw head as indicated above.
<LI type=1>Remove the exhaust pipe clamp.

<FONT color=brown>Important:ONLY 6.0L equipped vehicles
require a new exhaust pipe clamp, P/N15103174.
</FONT></P>
<LI type=1>On 6.0L equipped vehicles only, install a new exhaust pipe
clamp, P/N15103174, on the exhaust pipe.
<LI type=1>Reposition the muffler in the correct position.
<LI type=1>Slide the muffler forward into position, aligning the studs with
the rear of the catalytic converter.
<LI type=1>Install the nuts securing the muffler to the catalytic converter,
but DO NOT tighten at this time.
<LI type=1>Apply a soapy solution to the following areas in order to ease the
installation of the hangers.
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>The inner diameter of the exhaust pipe hanger
</TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>The exhaust pipe hanger rod </TD></TR></TBODY></TABLE></DIV>
<LI type=1>Press the exhaust pipe hangers over the exhaust pipe hanger rods.

Tighten
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>Tighten the muffler nuts by hand until each contacts the
metal flange. </TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>Tighten the muffler nuts to 45N·m
(33lbft). </TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>On 6.0L equipped vehicles only, tighten the
exhaust clamp to 50N·m (36lbft).
</TD></TR></TBODY></TABLE></DIV>
<LI type=1>Lower the vehicle. </LI>

<A name=ss4-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc=sm#ss4-1582162">
<H5>Dealer Action</A></H5>

Please contact all customers that were told they would be called when a
repair became available.</P><A name=ss5-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc=sm#ss5-1582162">
<H5>Parts Information</A></H5>
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TH vAlign=bottom align=middle>

Part Number</P></TH>
<TH vAlign=bottom align=middle>

Description</P></TH>
<TH vAlign=bottom align=middle>

Qty</P></TH></TR>
<TR>
<TD vAlign=center align=middle>

15253526</P></TD>
<TD vAlign=center align=middle>

Shield, Muffler Heat Shield</P>

with 4.8L or 5.3L engine</P></TD>
<TD vAlign=center align=middle>

1</P></TD></TR>
<TR>
<TD vAlign=center align=middle>

10393433</P></TD>
<TD vAlign=center align=middle>

Shield, Muffler Heat Shield</P>

with 6.0L engine</P></TD>
<TD vAlign=center align=middle>

1</P></TD></TR>
<TR>
<TD vAlign=center align=middle>

15103174</P></TD>
<TD vAlign=center align=middle>

Clamp, Exhaust Pipe</P>

with 6.0L engine ONLY</P></TD>
<TD vAlign=center align=middle>

1</P></TD></TR>
<TR>
<TD vAlign=center align=middle>

10391259</P></TD>
<TD vAlign=center align=middle>

Strap, Muffler Heat Shield Strap</P></TD>
<TD vAlign=center align=middle>

3</P></TD></TR></TBODY></TABLE>

Parts are currently available from GMSPO.</P><A name=ss6-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc=sm#ss6-1582162">
<H5>Warranty Information</A></H5>

For vehicles repaired under warranty, use:</P>
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TH vAlign=bottom align=middle>

Labor Operation</P></TH>
<TH vAlign=bottom align=middle>

Description</P></TH>
<TH vAlign=bottom align=middle>

Labor Time</P></TH></TR>
<TR>
<TD vAlign=center align=middle>

L2540</P></TD>
<TD vAlign=center align=middle>

Shield, Muffler Heat Shield - Replace</P></TD>
<TD vAlign=center align=middle>

0.8hr</P></TD></TR></TBODY></TABLE>

</P>
<TABLE width="100%">
<TBODY>
<TR>
<TD align=left width=778><FONT size=1>GM bulletins are intended for use by
professional technicians, NOT a "do-it-yourselfer". They are written
to inform these technicians of conditions that may occur on some vehicles,
or to provide information that could assist in the proper service of a
vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely.
If a condition is described, DO NOT assume that the bulletin applies to
your vehicle, or that your vehicle will have that condition. See
your GM dealer for information on whether your vehicle may benefit from
the information.
</FONT></TD>
<TD align=middle width=42></TD>
<TD align=middle width=167><FONT size=2>WE SUPPORT VOLUNTARY TECHNICIAN
CERTIFICATION
</FONT></TD></TR></TBODY></TABLE>
<P align=center>© Copyright General Motors Corporation. All Rights
Reserved. </P>
<FORM name=bottomNavForm>
<HR>

<TABLE width="100%" align=center>
<TBODY>
<TR>
<TD width="25%" slign="LEFT"></TD>
<TD align=middle width="50%">Document ID# 1582162
2003 HUMMER
H2 </TD>
<TD align=right width="25%"></TD></TR></TBODY></TABLE></FORM></BODY></HTML>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML><HEAD><TITLE>Service Information</TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
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<FORM name=topNavForm action=/servlets/CellHandler>
<TABLE width="100%" align=center>
<TBODY>
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<TD width="25%" slign="LEFT"></TD>
<TD align=middle width="50%">Document ID# 1582162
2003 HUMMER
H2 </TD>
<TD align=right width="25%"></TD></TR></TBODY></TABLE></FORM>
<HR>
</FORM>
<H1>Popping/Snapping Noise When Vehicle is Hot, at Idle or Immediately After
Vehicle is Shut Off (Replace Muffler Heat Shield) #03-06-05-008B - (Jan 13,
2005)</H1></TABLE>Popping/Snapping Noise When Vehicle is Hot, at Idle or
Immediately After Vehicle is Shut Off (Replace Muffler Heat Shield)

2002-2005 Cadillac Escalade, Escalade EXT</P>

2003-2005 Cadillac Escalade ESV</P>

2002-2005 Chevrolet Avalanche, Suburban, Tahoe</P>

2002-2005 GMC Yukon, Yukon Denali, Yukon Denali XL</P>

2003-2005 HUMMER H2</P>

with 4.8L, 5.3L or 6.0L Gasoline Engine (VINs N, U, T, V, Z
-- RPOs LQ9, LQ4, LM7, LR4, L59) </P>

This Bulletin DOES NOT APPLY 8.1L vehicles at this time.</P>

This bulletin is being revised to include additional models and parts
availability. Please discard Advanced Service Information Bulletin
Number03-06-05-008A (Section 06 -- Engine/Propulsion System).</P><A
name=ss1-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc= sm#ss1-1582162">
<H5>Condition</A></H5>

Some customers may comment on a popping/snapping noise from underneath the
vehicle at idle or immediately after the vehicle is shut off. Some
popping/snapping noise from the exhaust system during cool down is a normal
condition.</P>

The noise may be intermittent depending on the outside temperature and or
temperature of the exhaust system at the time of testing.</P><A
name=ss2-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc= sm#ss2-1582162">
<H5>Cause</A></H5>

As the exhaust system warms and cools, the muffler and the muffler heat
shield expand and contract at different rates and may cause a popping and/or
snapping noise. </P>

Some popping/snapping noise from the exhaust system during cool down is a
normal condition. The customer should be made aware that this service procedure
is designed to reduce but not eliminate all exhaust system popping and snapping
during cool down.</P><A name=ss3-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc= sm#ss3-1582162">
<H5>Correction</A></H5>
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TH vAlign=bottom align=middle>

DO THIS</P></TH>
<TH vAlign=bottom align=middle>

DON'T DO THIS</P></TH></TR>
<TR>
<TD vAlign=center align=middle>

Install a new heat shield and straps on the existing muffler.</P></TD>
<TD vAlign=center align=middle>

DO NOT replace exhaust system components other than the muffler heat
shield. </P></TD></TR></TBODY></TABLE>

Follow the service procedure below to correct this condition.</P>

<FONT color=brown>Important:Some popping/snapping noise from the
exhaust system during cool down is a normal condition. The customer should be
made aware that this service procedure is designed to reduce but not eliminate
all exhaust system popping and snapping during cool down.
</FONT></P>

<LI type=1>Raise and support the vehicle. Refer to Lifting and Jacking the
Vehicle in General Information (SI Document ID #737171).

<FONT color=red>Caution:
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT color=red
size=4>•</FONT></TD>
<TD vAlign=top><FONT color=red>In order to avoid being burned, do not
service the exhaust system while it is still hot. Service the system
when it is cool. </FONT></TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT color=red
size=4>•</FONT></TD>
<TD vAlign=top><FONT color=red>Always wear protective goggles and gloves
when removing exhaust parts as falling rust and sharp edges could result
in serious personal injury. </FONT></TD></TR></TBODY></TABLE></DIV></FONT>

</P>
<LI type=1>Remove the nuts securing the muffler to the catalytic converter.
<LI type=1>On 6.0L equipped vehicles only, loosen the exhaust pipe
clamp.

<FONT color=brown>Important:Do not use oil base lubricants on
the rubber exhaust hangers.
</FONT></P>
<LI type=1>Apply a soapy solution to the exhaust pipe hanger rods in order to
ease the removal of the exhaust hangers.
<LI type=1>Pry the exhaust hangers free from the exhaust pipe hanger rods.

<FONT color=brown>Important:It is not necessary to remove the
muffler from the vehicle to replace the muffler heat shield.
</FONT></P>
<LI type=1>Reposition the muffler to gain access to the muffler heat shield.

<FONT color=blue>Notice:Use extreme caution not to damage the
muffler when removing the heat shield from the muffler.</FONT></P>
<LI type=1>Using an air-powered hack saw blade, or equivalent, cut off the
existing muffler heat shield just as the heat shield rises off of the muffler.
See the illustration above.
<LI type=1>Remove the heat shield from the muffler.
<LI type=1>Hammer flush the remaining heat shield to the muffler.

<FONT color=brown>Important:
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT color=brown
size=4>•</FONT></TD>
<TD vAlign=top><FONT color=brown>The new heat shield should not come in
contact with the remaining muffler heat shield.
</FONT></TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT color=brown
size=4>•</FONT></TD>
<TD vAlign=top><FONT color=brown>The new heat shield should not come in
contact with the horizontal lock seam on the muffler.
</FONT></TD></TR></TBODY></TABLE></DIV></FONT>

</P>
<LI type=1>Install the new heat shield, P/N10393433, onto the muffler as
shown above.

<LI type=1>Install three straps, P/N10391259, so that the strap screw
head will be located on top of the muffler.

Tighten
Tighten the strap screw to 4N·m
(35lbin). </P>

<LI type=1>Cut off the excess strap material and bend the strap over the strap
screw head as indicated above.
<LI type=1>Remove the exhaust pipe clamp.

<FONT color=brown>Important:ONLY 6.0L equipped vehicles
require a new exhaust pipe clamp, P/N15103174.
</FONT></P>
<LI type=1>On 6.0L equipped vehicles only, install a new exhaust pipe
clamp, P/N15103174, on the exhaust pipe.
<LI type=1>Reposition the muffler in the correct position.
<LI type=1>Slide the muffler forward into position, aligning the studs with
the rear of the catalytic converter.
<LI type=1>Install the nuts securing the muffler to the catalytic converter,
but DO NOT tighten at this time.
<LI type=1>Apply a soapy solution to the following areas in order to ease the
installation of the hangers.
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>The inner diameter of the exhaust pipe hanger
</TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>The exhaust pipe hanger rod </TD></TR></TBODY></TABLE></DIV>
<LI type=1>Press the exhaust pipe hangers over the exhaust pipe hanger rods.

Tighten
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>Tighten the muffler nuts by hand until each contacts the
metal flange. </TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>Tighten the muffler nuts to 45N·m
(33lbft). </TD></TR></TBODY></TABLE></DIV>
<DIV align=left>
<TABLE border=0>
<TBODY>
<TR>
<TD vAlign=top><FONT size=4>•</FONT></TD>
<TD vAlign=top>On 6.0L equipped vehicles only, tighten the
exhaust clamp to 50N·m (36lbft).
</TD></TR></TBODY></TABLE></DIV>
<LI type=1>Lower the vehicle. </LI>

<A name=ss4-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc= sm#ss4-1582162">
<H5>Dealer Action</A></H5>

Please contact all customers that were told they would be called when a
repair became available.</P><A name=ss5-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc= sm#ss5-1582162">
<H5>Parts Information</A></H5>
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TH vAlign=bottom align=middle>

Part Number</P></TH>
<TH vAlign=bottom align=middle>

Description</P></TH>
<TH vAlign=bottom align=middle>

Qty</P></TH></TR>
<TR>
<TD vAlign=center align=middle>

15253526</P></TD>
<TD vAlign=center align=middle>

Shield, Muffler Heat Shield</P>

with 4.8L or 5.3L engine</P></TD>
<TD vAlign=center align=middle>

1</P></TD></TR>
<TR>
<TD vAlign=center align=middle>

10393433</P></TD>
<TD vAlign=center align=middle>

Shield, Muffler Heat Shield</P>

with 6.0L engine</P></TD>
<TD vAlign=center align=middle>

1</P></TD></TR>
<TR>
<TD vAlign=center align=middle>

15103174</P></TD>
<TD vAlign=center align=middle>

Clamp, Exhaust Pipe</P>

with 6.0L engine ONLY</P></TD>
<TD vAlign=center align=middle>

1</P></TD></TR>
<TR>
<TD vAlign=center align=middle>

10391259</P></TD>
<TD vAlign=center align=middle>

Strap, Muffler Heat Shield Strap</P></TD>
<TD vAlign=center align=middle>

3</P></TD></TR></TBODY></TABLE>

Parts are currently available from GMSPO.</P><A name=ss6-1582162><A
href="http://204.89.220.10:9001/servlets/BlobShtml?ShtmlFile=1582162&pubid=293&evc= sm#ss6-1582162">
<H5>Warranty Information</A></H5>

For vehicles repaired under warranty, use:</P>
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TH vAlign=bottom align=middle>

Labor Operation</P></TH>
<TH vAlign=bottom align=middle>

Description</P></TH>
<TH vAlign=bottom align=middle>

Labor Time</P></TH></TR>
<TR>
<TD vAlign=center align=middle>

L2540</P></TD>
<TD vAlign=center align=middle>

Shield, Muffler Heat Shield - Replace</P></TD>
<TD vAlign=center align=middle>

0.8hr</P></TD></TR></TBODY></TABLE>

</P>
<TABLE width="100%">
<TBODY>
<TR>
<TD align=left width=778><FONT size=1>GM bulletins are intended for use by
professional technicians, NOT a "do-it-yourselfer". They are written
to inform these technicians of conditions that may occur on some vehicles,
or to provide information that could assist in the proper service of a
vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely.
If a condition is described, DO NOT assume that the bulletin applies to
your vehicle, or that your vehicle will have that condition. See
your GM dealer for information on whether your vehicle may benefit from
the information.
</FONT></TD>
<TD align=middle width=42></TD>
<TD align=middle width=167><FONT size=2>WE SUPPORT VOLUNTARY TECHNICIAN
CERTIFICATION
</FONT></TD></TR></TBODY></TABLE>
<P align=center>© Copyright General Motors Corporation. All Rights
Reserved. </P>
<FORM name=bottomNavForm>
<HR>

<TABLE width="100%" align=center>
<TBODY>
<TR>
<TD width="25%" slign="LEFT"></TD>
<TD align=middle width="50%">Document ID# 1582162
2003 HUMMER
H2 </TD>
<TD align=right width="25%"></TD></TR></TBODY></TABLE></FORM></BODY></HTML>