Anyone have a copy of this bullitin? I tried to check the GM calibration history site and unable to get any information from there site with my vin #. Had the truck in for service last week, dealer added 4-5th lockout switch and claims i,m up to date with tcm updates. 3/6 the calibration history didn't show this tbs. Edited by: Biodiesel66

<H1>Harsh or Delayed 2-1 Downshift,Neutral Feel at a Stop, Shift Busyness, DTCs P0708, P0847, P0872, P0875, P1711, P1713 (Reprogram TCM) #02-07-30-020 04/22/2002)</H1>


Harsh or Delayed 2-1 Downshift, Neutral Feel at a Stop, Shift Busyness, DTCs P0708, P0847, P0872, P0875, P1711, P1713 (Reprogram TCM and, if necessary, Reprogram PCM))


2001-02 Chevrolet and GMC C/K 2500/3500 (3/4 and 1 Ton) Series Pickup Models (Silverado and Sierra)


with Allison® Series 1000 Automatic Transmission (RPO M74)<A name=ss1-880188><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=880188&amp;evc=numSrch#ss1-880188" target="_blank">
<H5>Condition</A></H5>


Some customers may comment on a harsh or delayed 2-1 downshift, a neutral feel at a stop or shift busyness (excessive shifting). Upon investigation, the technician may also find one or more of the following DTCs set:
<UL ="BULLET">
<LI>P0708
<LI>P0847
<LI>P0872
<LI>P0875
<LI>P1711
<LI>P1713 </LI>[/list]<A name=ss2-880188><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=880188&amp;evc=numSrch#ss2-880188" target="_blank">
<H5>Correction</A></H5>


Reprogram the Transmission Control Module (TCM) with the new service calibrations which were available from Techline starting March 24, 2002 on the TIS2000 version 3.5 or later. These calibrations are electronic calibrations and are NOT available from GMSPO.


These new calibrations will address the following conditions:
<TABLE width="100%" border=1><T><T><T><T><T>
<T>
<TR>
<TH vAlign=bottom align=middle>


2001</TH>
<TH vAlign=bottom align=middle>


2002</TH></TR>
<TR>
<TD vAlign=center align=middle>


Delayed 2-1 downshift at a stop</TD>
<TD vAlign=center align=middle>


2-1 downshift quality concerns</TD></TR>
<TR>
<TD vAlign=center align=middle>


Flare &amp; bump on low speed coast-down and throttle reapply</TD>
<TD vAlign=center align=middle>


Cold shift quality concerns</TD></TR>
<TR>
<TD vAlign=center align=middle>


2-1 closed throttle neutral feel</TD>
<TD vAlign=center align=middle>


*Shift busyness</TD></TR>
<TR>
<TD vAlign=center align=middle>


Harsh 2-1 downshift</TD>
<TD vAlign=center align=middle>


DTC P0708, P0847, P0872, P0875, P1711, P1713</TD></TR>
<TR>
<TD vAlign=center align=middle>


Shift busyness</TD>
<TD vAlign=center align=middle>


2-1 closed throttle neutral feel</TD></TR></T></T></T></T></T></T></TABLE>



<H4>*Important</H4>


2002 Vehicles with 8.1L Engine --


If the concern is shift busyness, the PCM must also be reflashed to gain maximum benefit from the new TCM service calibration. This calibration was available from Techline starting March 10, 2002 on the TIS2000 version 3.0 or later. If the concern is not shift busyness, this step is not required.


This additional step is not required on vehicles with a 6.6L diesel engine (RPO LB7) or 2001 vehicles with an 8.1L engine (RPO L18).


<A name=ss3-880188><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=880188&amp;evc=numSrch#ss3-880188" target="_blank">
<H5>Warranty Information</A></H5>


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


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


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


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


K5364</FON

Does this mean 2003 and later trucks are not affected and have the updated tune?





Thanks

Any truck built after the March,2002 timeframe came with the updated programs for the conditions listed above. However, there still may be other updates available for your vehicle for conditions not listed above.


My truck was built in Oct, 2001 (2002 model). I had several of the issues above and about a month ago the dealer updated both the TCM and ECM as described by this TSB. So what I got was all the changes listed above plus any other software changes they made from Mar 2002 to Feb 2004.