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Technical Service Bulletins of the 2003 Isuzu NQR

There have been 20 technical service bulletins issued for the 2003 Isuzu NQR.

1 2003 Isuzu NQR engine and engine cooling TSB (Bulletin IB-14-X-001)

Bulletin Date:	Aug. 1, 2014
Component:	Engine and engine cooling.
Bulletin Summary:	Isuzu: information regarding corrosion inhibitor improvement that changes color of coolant to a dark color and is added at port to both radiator and surge tank.
Vehicles covered in this TSB:	1998 Isuzu N Series, 1999 Isuzu N Series, 2000 Isuzu N Series, 2001 Isuzu N Series, 2002 Isuzu N Series, 2003 Isuzu N Series, 2004 Isuzu N Series, 1997 Isuzu N-series, 1998 Isuzu N-series, 1999 Isuzu N-series, 2000 Isuzu N-series, 2001 Isuzu N-series, 2002 Isuzu N-series, 2003 Isuzu N-series, 2004 Isuzu N-series, 2005 Isuzu N-series, 2006 Isuzu N-series, 2007 Isuzu N-series, 2008 Isuzu N-series, 2009 Isuzu N-series, 2010 Isuzu N-series, 2011 Isuzu N-series, 2012 Isuzu N-series, 2013 Isuzu N-series, 1994 Isuzu NPR, 1995 Isuzu NPR, 1996 Isuzu NPR, 1997 Isuzu NPR, 1998 Isuzu NPR, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 2004 Isuzu NPR, 2005 Isuzu NPR, 2006 Isuzu NPR, 2007 Isuzu NPR, 2008 Isuzu NPR, 2009 Isuzu NPR, 2010 Isuzu NPR, 2012 Isuzu NPR, 1995 Isuzu Npr Hd, 1996 Isuzu Npr Hd, 1998 Isuzu Npr Hd, 1999 Isuzu Npr Hd, 2000 Isuzu Npr Hd, 2001 Isuzu Npr Hd, 2005 Isuzu Npr Hd, 2006 Isuzu Npr Hd, 2007 Isuzu Npr Hd, 2008 Isuzu Npr Hd, 2009 Isuzu Npr Hd, 2010 Isuzu Npr Hd, 2004 Isuzu Npr-hd, 2005 Isuzu Npr-hd, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR, 2004 Isuzu NQR, 2005 Isuzu NQR, 2006 Isuzu NQR, 2007 Isuzu NQR, 2008 Isuzu NQR, 2009 Isuzu NQR, 2010 Isuzu NQR, 2012 Isuzu NQR, 1994 Isuzu NRR, 1995 Isuzu NRR, 1996 Isuzu NRR, 1997 Isuzu NRR, 1998 Isuzu NRR, 1999 Isuzu NRR, 2000 Isuzu NRR, 2001 Isuzu NRR, 2002 Isuzu NRR, 2003 Isuzu NRR, 2004 Isuzu NRR, 2005 Isuzu NRR, 2006 Isuzu NRR, 2007 Isuzu NRR, 2008 Isuzu NRR, 2009 Isuzu NRR, 2010 Isuzu NRR.

2 2003 Isuzu NQR engine and engine cooling TSB (Bulletin IB-14-X-001)

Bulletin Date:	Aug. 1, 2014
Component:	Engine and engine cooling.
Bulletin Summary:	Isuzu: information regarding corrosion inhibitor improvement that changes color of coolant to a dark color and is added at port to both radiator and surge tank.
Vehicles covered in this TSB:	1998 Isuzu N Series, 1999 Isuzu N Series, 2000 Isuzu N Series, 2001 Isuzu N Series, 2002 Isuzu N Series, 2003 Isuzu N Series, 2004 Isuzu N Series, 1997 Isuzu N-series, 1998 Isuzu N-series, 1999 Isuzu N-series, 2000 Isuzu N-series, 2001 Isuzu N-series, 2002 Isuzu N-series, 2003 Isuzu N-series, 2004 Isuzu N-series, 2005 Isuzu N-series, 2006 Isuzu N-series, 2007 Isuzu N-series, 2008 Isuzu N-series, 2009 Isuzu N-series, 2010 Isuzu N-series, 2011 Isuzu N-series, 2012 Isuzu N-series, 2013 Isuzu N-series, 1994 Isuzu NPR, 1995 Isuzu NPR, 1996 Isuzu NPR, 1997 Isuzu NPR, 1998 Isuzu NPR, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 2004 Isuzu NPR, 2005 Isuzu NPR, 2006 Isuzu NPR, 2007 Isuzu NPR, 2008 Isuzu NPR, 2009 Isuzu NPR, 2010 Isuzu NPR, 2012 Isuzu NPR, 1995 Isuzu Npr Hd, 1996 Isuzu Npr Hd, 1998 Isuzu Npr Hd, 1999 Isuzu Npr Hd, 2000 Isuzu Npr Hd, 2001 Isuzu Npr Hd, 2005 Isuzu Npr Hd, 2006 Isuzu Npr Hd, 2007 Isuzu Npr Hd, 2008 Isuzu Npr Hd, 2009 Isuzu Npr Hd, 2010 Isuzu Npr Hd, 2004 Isuzu Npr-hd, 2005 Isuzu Npr-hd, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR, 2004 Isuzu NQR, 2005 Isuzu NQR, 2006 Isuzu NQR, 2007 Isuzu NQR, 2008 Isuzu NQR, 2009 Isuzu NQR, 2010 Isuzu NQR, 2012 Isuzu NQR, 1994 Isuzu NRR, 1995 Isuzu NRR, 1996 Isuzu NRR, 1997 Isuzu NRR, 1998 Isuzu NRR, 1999 Isuzu NRR, 2000 Isuzu NRR, 2001 Isuzu NRR, 2002 Isuzu NRR, 2003 Isuzu NRR, 2004 Isuzu NRR, 2005 Isuzu NRR, 2006 Isuzu NRR, 2007 Isuzu NRR, 2008 Isuzu NRR, 2009 Isuzu NRR, 2010 Isuzu NRR.

3 2003 Isuzu NQR automatic transmission TSB (Bulletin 030730035)

Bulletin Date:	Oct. 1, 2006
Component:	Automatic transmission.
Bulletin Summary:	Replacement of output flange nut when servicing transmission. Also includes 2004 models.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 2004 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 2004 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 2004 Isuzu NPR, 2005 Isuzu NPR, 2006 Isuzu NPR, 2007 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR, 2004 Isuzu NQR, 2005 Isuzu NQR, 2006 Isuzu NQR, 2007 Isuzu NQR.

4 2003 Isuzu NQR engine TSB (Bulletin 030604002A)

Bulletin Date:	Feb. 1, 2006
Component:	Engine.
Bulletin Summary:	Vehicle no-start in extreme cold.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 2004 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 2004 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 2004 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR, 2004 Isuzu NQR.

5 2003 Isuzu NQR power train TSB (Bulletin 030730004B)

Bulletin Date:	Sep. 1, 2005
Component:	Power train.
Bulletin Summary:	Revision of aisin transmission quality center (tqc) program beginning October 1, 2003.
Vehicles covered in this TSB:	2003 Chevrolet W Series, 2004 Chevrolet W3500, 2005 Chevrolet W3500, 2006 Chevrolet W3500, 2004 Chevrolet W4500, 2005 Chevrolet W4500, 2006 Chevrolet W4500, 2004 Chevrolet W5500, 2005 Chevrolet W5500, 2006 Chevrolet W5500, 2003 GMC W Series, 2004 GMC W Series, 2005 GMC W Series, 2006 GMC W Series, 2004 GMC W5500, 2005 GMC W5500, 2006 GMC W5500, 2003 Isuzu NPR, 2005 Isuzu NPR, 2006 Isuzu NPR, 2003 Isuzu NQR, 2005 Isuzu NQR, 2006 Isuzu NQR.

6 2003 Isuzu NQR engine TSB (Bulletin 050601014)

Bulletin Date:	May. 1, 2005
Component:	Engine.
Bulletin Summary:	Oil leak under extreme cold temperatures (-34 degrees c) (-30 degrees f) or colder).
Vehicles covered in this TSB:	2004 Buick Rainier, 2005 Buick Rainier, 2004 Cadillac CTS, 2005 Cadillac CTS, 2003 Cadillac Escalade, 2004 Cadillac Escalade, 2005 Cadillac Escalade, 2003 Chevrolet Avalanche, 2004 Chevrolet Avalanche, 2005 Chevrolet Avalanche, 2003 Chevrolet Express, 2004 Chevrolet Express, 2005 Chevrolet Express, 2003 Chevrolet Kodiak, 2004 Chevrolet Kodiak, 2005 Chevrolet Kodiak, 2003 Chevrolet Silverado, 2004 Chevrolet Silverado, 2005 Chevrolet Silverado, 2003 Chevrolet SSR, 2004 Chevrolet SSR, 2005 Chevrolet SSR, 2003 Chevrolet Suburban, 2004 Chevrolet Suburban, 2005 Chevrolet Suburban, 2003 Chevrolet Tahoe, 2004 Chevrolet Tahoe, 2005 Chevrolet Tahoe, 2003 Chevrolet Trailblazer, 2004 Chevrolet Trailblazer, 2005 Chevrolet Trailblazer, 2003 GMC Envoy, 2004 GMC Envoy, 2005 GMC Envoy, 2003 GMC Savana, 2004 GMC Savana, 2005 GMC Savana, 2003 GMC Sierra, 2004 GMC Sierra, 2005 GMC Sierra, 2003 GMC Topkick, 2004 GMC Topkick, 2005 GMC Topkick, 2003 GMC Yukon, 2004 GMC Yukon, 2005 GMC Yukon, 2003 Hummer H2, 2004 Hummer H2, 2005 Hummer H2, 2003 Isuzu NPR, 2003 Isuzu NQR, 2005 Pontiac Grand Prix, 2004 Pontiac GTO, 2005 Pontiac GTO, 2003 Workhorse Chassis.

7 2003 Isuzu NQR exhaust system emission control TSB (Bulletin 050604021)

Bulletin Date:	Mar. 1, 2005
Component:	Exhaust system emission control.
Bulletin Summary:	Revised inspection/maintenance (I/m) evaporative emission (evap) system set procedure.
Vehicles covered in this TSB:	2004 Buick Rainier, 2003 Cadillac Escalade, 2004 Cadillac Escalade, 2003 Chevrolet Astro, 2004 Chevrolet Astro, 2003 Chevrolet Avalanche, 2004 Chevrolet Avalanche, 2003 Chevrolet Blazer, 2004 Chevrolet Blazer, 2003 Chevrolet Express, 2004 Chevrolet Express, 2003 Chevrolet S10, 2004 Chevrolet S10, 2003 Chevrolet Silverado, 2004 Chevrolet Silverado, 2003 Chevrolet SSR, 2004 Chevrolet SSR, 2003 Chevrolet Suburban, 2004 Chevrolet Suburban, 2003 Chevrolet Tahoe, 2004 Chevrolet Tahoe, 2003 Chevrolet Trailblazer, 2004 Chevrolet Trailblazer, 2003 GMC Envoy, 2004 GMC Envoy, 2003 GMC Jimmy, 2004 GMC Jimmy, 2003 GMC Safari, 2004 GMC Safari, 2003 GMC Savana, 2004 GMC Savana, 2003 GMC Sierra, 2004 GMC Sierra, 2004 GMC Sonoma, 2003 GMC Yukon, 2004 GMC Yukon, 2003 Hummer H2, 2004 Hummer H2, 2003 Isuzu Ascender, 2004 Isuzu Ascender, 2003 Isuzu NPR, 2004 Isuzu NPR, 2003 Isuzu NQR, 2004 Isuzu NQR.

8 2003 Isuzu NQR engine TSB (Bulletin 030604033)

Bulletin Date:	Mar. 1, 2004
Component:	Engine.
Bulletin Summary:	Revised diagnostic trouble code p0336. Update. To include 2004 isuzu nqr commercial models.
Vehicles covered in this TSB:	2004 Buick Rainier, 2003 Cadillac Escalade, 2003 Chevrolet Astro, 2004 Chevrolet Astro, 2003 Chevrolet Avalanche, 2003 Chevrolet Blazer, 2004 Chevrolet Blazer, 2003 Chevrolet Express, 2004 Chevrolet Express, 2003 Chevrolet Kodiak, 2004 Chevrolet Kodiak, 2003 Chevrolet S10, 2004 Chevrolet S10, 2003 Chevrolet Silverado, 2003 Chevrolet Suburban, 2003 Chevrolet Tahoe, 2003 Chevrolet Trailblazer, 2004 Chevrolet Trailblazer, 2003 Chevrolet W Series, 2003 GMC Envoy, 2004 GMC Envoy, 2003 GMC Jimmy, 2004 GMC Jimmy, 2003 GMC Safari, 2004 GMC Safari, 2003 GMC Savana, 2004 GMC Savana, 2003 GMC Sierra, 2003 GMC Sonoma, 2004 GMC Sonoma, 2003 GMC Topkick, 2003 GMC Yukon, 2003 Hummer H2, 2004 Hummer H2, 2003 Isuzu Ascender, 2004 Isuzu Ascender, 2003 Isuzu NPR, 2004 Isuzu NPR, 2003 Isuzu NQR, 2004 Isuzu NQR.

9 2003 Isuzu NQR automatic transmission TSB (Bulletin 040730008)

Bulletin Date:	Mar. 1, 2004
Component:	Automatic transmission.
Bulletin Summary:	Aisin automatic transmission fluid service reminder. 2005 isuzu npr/nqr included.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 2004 Chevrolet W Series, 2005 Chevrolet W3500, 2005 Chevrolet W4500, 2005 Chevrolet W5500, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 2004 GMC W Series, 2005 GMC W Series, 2005 GMC W5500, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 2004 Isuzu NPR, 2005 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

10 2003 Isuzu NQR engine TSB (Bulletin 010604048)

Bulletin Date:	Feb. 1, 2004
Component:	Engine.
Bulletin Summary:	Availability of new fuel injection pump oil supply pipe for replacement after removal.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 2004 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 2004 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 2004 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

11 2003 Isuzu NQR engine TSB (Bulletin 030604066)

Bulletin Date:	Dec. 1, 2003
Component:	Engine.
Bulletin Summary:	Throttle position sensor replacement procedure.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

12 2003 Isuzu NQR engine TSB (Bulletin 030604063)

Bulletin Date:	Nov. 1, 2003
Component:	Engine.
Bulletin Summary:	Mi-tics injection pump exchange program/warranty guidelines effective October 1, 2003.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

13 2003 Isuzu NQR automatic transmission TSB (Bulletin 030730060)

Bulletin Date:	Nov. 1, 2003
Component:	Automatic transmission.
Bulletin Summary:	Automatic transmission oil cooler flushing on certain medium duty tilt cab models and commercial models including model year 2004.
Vehicles covered in this TSB:	1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

14 2003 Isuzu NQR automatic transmission TSB (Bulletin 030730050)

Bulletin Date:	Oct. 1, 2003
Component:	Automatic transmission.
Bulletin Summary:	Approved aisin automatic transmission on-vehicle repairs. 2004 models included.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

15 2003 Isuzu NQR fuel injection system TSB (Bulletin 030604042)

Bulletin Date:	Sep. 1, 2003
Component:	Fuel injection system.
Bulletin Summary:	Proper positioning of fuel injection pump primer handle after use.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

16 2003 Isuzu NQR automatic transmission TSB (Bulletin 020730025B)

Bulletin Date:	Jul. 1, 2003
Component:	Automatic transmission.
Bulletin Summary:	Harsh shifting, delayed upshifts with possible check trans lamp illuminated, possible diagnostic trouble code (dtc) 21 set. To include 2004 models.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

17 2003 Isuzu NQR power train TSB (Bulletin 030730015)

Bulletin Date:	May. 1, 2003
Component:	Power train.
Bulletin Summary:	Release of new tools for service: j 37228 - oil pan seal cutter, j 41736 - installer (rear output shaft seal) and dt 46717 - rear output shaft seal remover.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

18 2003 Isuzu NQR engine TSB (Bulletin 030604002)

Bulletin Date:	Jan. 1, 2003
Component:	Engine.
Bulletin Summary:	Vehicle no-start in extreme cold.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

19 2003 Isuzu NQR automatic transmission TSB (Bulletin 020730025A)

Bulletin Date:	Sep. 1, 2002
Component:	Automatic transmission.
Bulletin Summary:	Harsh shifting, delayed upshifts, possible check trans lamp illuminated, possible diagnostic trouble code 21 stored in tcm memory.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

20 2003 Isuzu NQR automatic transmission TSB (Bulletin 020730025)

Bulletin Date:	Jun. 1, 2002
Component:	Automatic transmission.
Bulletin Summary:	Subject regarding harsh shifting, delayed upshifts, possible check trans lamp illuminated, possible diagnostic trouble code 21 stored in the transmission control module (tcm) memory.
Vehicles covered in this TSB:	1999 Chevrolet W Series, 2000 Chevrolet W Series, 2001 Chevrolet W Series, 2002 Chevrolet W Series, 2003 Chevrolet W Series, 1999 GMC W Series, 2000 GMC W Series, 2001 GMC W Series, 2002 GMC W Series, 2003 GMC W Series, 1999 Isuzu NPR, 2000 Isuzu NPR, 2001 Isuzu NPR, 2002 Isuzu NPR, 2003 Isuzu NPR, 1999 Isuzu NQR, 2000 Isuzu NQR, 2001 Isuzu NQR, 2002 Isuzu NQR, 2003 Isuzu NQR.

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