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Document ID# 1371241
2003 HUMMER
H2 </TD>
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<H1>Malfunction Indicator Lamp (MIL) On, Transmission Stuck in Third Gear,
Insrument Cluster Inoperative (Replace Ignition Switch) #01-07-30-002C -
(08/21/2003)</H1></TABLE>Malfunction Indicator Lamp (MIL) On, Transmission Stuck
in Third Gear, Instrument Cluster Inoperative (Replace Ignition Switch)
1999-2000 Cadillac Escalade</P>
2002-2003 Cadillac Escalade, Escalade EXT</P>
2003 Cadillac ESV</P>
1997-1999 Chevrolet Full-Size Pickup, Suburban, Tahoe (Old Style)</P>
1997-2003 Chevrolet Blazer, Express, S-10</P>
1999-2003 Chevrolet Silverado, Suburban, Tahoe (New Style)</P>
1999-2003 Chevrolet Blazer RH Drive (Export)</P>
2002-2003 Chevrolet Avalanche, TrailBlazer, TrailBlazer EXT</P>
1997-1999 GMC Sierra, Suburban, Yukon (Old Style)</P>
1997-2001 GMC Jimmy</P>
1997-2003 GMC Savana, Sonoma</P>
1999-2003 GMC Sierra, Yukon, Yukon XL (New Style)</P>
2002-2003 GMC Envoy, Envoy XL</P>
1997-2003 Oldsmobile Bravada</P>
2002-2003 Oldsmobile Bravada</P>
with 4L60-E or 4L65-E Automatic Transmission (RPOsM30, M32)</P>
This bulletin is being revised to update the model years and to add
additional models. Please discard Corporate Bulletin Number01-07-30-002B
(Section07 -- Transmission/Transaxle).</P><A name=ss1-1371241><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=1371241&psdid=293&evc= sm#ss1-1371241">
<H5>Condition</A></H5>
Some customers may comment on one or more of the following conditions:</P>
<UL type=BULLET>
<LI>The Malfunction Indicator Lamp (MIL) is ON.
<LI>The transmission is stuck in third gear.
<LI>The instrument cluster is inoperative. </LI>[/list]
Upon investigation, one or all of the diagnostic trouble codes (DTCs) P0740,
P0753, P0758, P0785, P1860 may be set.</P><A name=ss2-1371241><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=1371241&psdid=293&evc= sm#ss2-1371241">
<H5>Cause</A></H5>
The most likely cause of this condition may be a loss of power to the
transmission on circuit1020. This loss of power may be caused by an open
in the ignition switch. This condition may also be the result of an incorrect
installation of an aftermarket electronic device such as a remote starter or
alarm system.</P><A name=ss3-1371241><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=1371241&psdid=293&evc= sm#ss3-1371241">
<H5>Correction</A></H5>
With the ignition switch in the RUN position, test for battery voltage at the
appropriate fuse listed below.</P>
<TABLE width="100%" border=1>
<TBODY>
<TR>
<TH vAlign=bottom align=middle>
Year</P></TH>
<TH vAlign=bottom align=middle>
Model</P></TH>
<TH vAlign=bottom align=middle>
Fuse</P></TH></TR>
<TR>
<TD vAlign=center align=middle>
1997</P></TD>
<TD vAlign=center align=middle>
S/T</P></TD>
<TD vAlign=center align=middle>
Trans24</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
1998-2003</P></TD>
<TD vAlign=center align=middle>
S/T</P>
(Old Style)</P></TD>
<TD vAlign=center align=middle>
Cluster11</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
1999-2003</P></TD>
<TD vAlign=center align=middle>
S/T (Export)</P></TD>
<TD vAlign=center align=middle>
Cluster23</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
2002-2003</P></TD>
<TD vAlign=center align=middle>
S/T</P>
(New Style)</P></TD>
<TD vAlign=center align=middle>
Ignition0</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
1997-2000</P></TD>
<TD vAlign=center align=middle>
C/K (Old Style)</P></TD>
<TD vAlign=center align=middle>
Trans20</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
1999-2003</P></TD>
<TD vAlign=center align=middle>
C/K (New Style)</P></TD>
<TD vAlign=center align=middle>
Ignition0</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
1997-2002</P></TD>
<TD vAlign=center align=middle>
G-Van</P></TD>
<TD vAlign=center align=middle>
Trans20</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
2003</P></TD>
<TD vAlign=center align=middle>
G, H-Van</P></TD>
<TD vAlign=center align=middle>
Ignition0</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
2003</P></TD>
<TD vAlign=center align=middle>
H2</P></TD>
<TD vAlign=center align=middle>
Ignition0</P></TD></TR></TBODY></TABLE>
If battery voltage is present at the fuse, inspect circuit1020 between
the fuse and the transmission for possible opens. If battery voltage is not
present at the fuse, replace the ignition switch using the Ignition Switch
Replacement procedure in the Steering Wheel and Column sub-section of the
applicable Service Manual. Refer to group number 2.188 of the parts catalog for
part description and usage.</P>
If the vehicle is equipped with an aftermarket electronic device and the DTCs
are being set when the device is being used, verify that the appropriate fuse
listed above is being supplied battery voltage during operation. If voltage is
not present at this fuse, these DTCs will be set due to lack of power at the
solenoids. This condition is most likely to occur with an incorrectly installed
remote starting system. If this is the case, refer the customer to the installer
of the system for corrections.</P><A name=ss4-1371241><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=1371241&psdid=293&evc= sm#ss4-1371241">
<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></TR>
<TR>
<TD vAlign=center align=middle>
See Group No. 2.188</P></TD>
<TD vAlign=center align=middle>
Switch, Ignition</P></TD></TR></TBODY></TABLE>
Parts are currently available from GMSPO.</P><A name=ss5-1371241><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=1371241&psdid=293&evc= sm#ss5-1371241">
<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>
N2328</P></TD>
<TD vAlign=center align=middle>
Switch, Ignition/Key Warning - Replace</P></TD>
<TD vAlign=center align=middle rowSpan=2>
Use published labor operation time</P></TD></TR>
<TR>
<TD vAlign=center align=middle>
N6630</P></TD>
<TD vAlign=center align=middle>
Wiring and/or Connector, Transmission - Repair</P></TD></TR></TBODY></TABLE>
</P>
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<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.
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Document ID# 1371241
2003 HUMMER
H2 </TD>
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