Hello Folks, Anyone able to recommend a good repair manual and or code reader for a H2. Don't know if im posting this in the right place. Engine light just came on. Truck runs great. Might be in default mode or who knows. They have readers at Autozone. Just wondering if anyone has any experience with readers and manuals. I cant find a hard copy of a repair manual for this thing anywhere. Preferrably a manual that deciphers codes. Any help would be appreciated. Thanks

 

try to visit some websites that will help you easily understand your manual. try to visit this website www. tpub. com/ content/ hummer

 

Picked up a reader at Autozone. Works great. Gives stats while car is running and clears codes. O2 sensors were detecting a lean mixture and throwing lean code on bank 1 and 2 . Clogged injectors might have been the problem. Changed filter and ran some injector cleaner. Check engine light has not returned. Still will check O2 readings now and see if they increased.