Were is the tcm on a 2006 gmc 2500 hd with a 6.0 engine

SOURCE: fan only works on high 02 gmc hd 2500

There is a resistor attached to the blower box. Replace the blower resistor and this should solve your problem

SOURCE: replacing pcv valve

driver side valve cover in the back of the cover. if it even has one, sometimes the cover has been replaced with a later style that uses a baffle instead of a pcv

SOURCE: 2003 gmc 2500 hd..horn doesn't work

The horn pad is made of vinyl which contracts through the four seasons causing this problem for some. Remove the horn pad with the battery disconnected first of all. Use a jumper wire to see if the horn works. If id does check the horn relay next. If ok hot wire the horn direct. One should be your problem or it is a broken wire instead

SOURCE: 2005 GMC 4x4 HD 2500 6.0 eng. rear axel seal

SEAL COULD BE LEAKING CAUSE YOU DIDNT LUBRICATE THE SEAL LIPS WITH PETROLEUM JELLY TO HELP THE THE SEAL LIP SEAL OR YOU DAMAGE THE SEAL WHILE DRIVING IT IN.AXLE FLANGE NUTS TORQUE IS 58 FT LBS THE AXLE HUB NUT TORQUE IS 177 FT LBS.

SOURCE: how do you reset a

Check engine light will go out when the management computer detects no more errors. Pull the codes and repair what they indicate.