One problem related to coolant leaking has been reported for the 2005 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 GMC Sierra 1500 based on all problems reported for the 2005 Sierra 1500.
Concerning gm 706 castech cylinder heads/gm TSB 06-06-01-019b I have a 2005 GMC sierra which has slowly been leaking coolant for about 6 months. I have had it looked at and the dealer informed me that I have a 706 castech cylinder head that is notorious for cracking and leaking. The dealer told me there was coolant inside my oil and recommended replacing the engine. As I have begun researching this issue I realize these cylinder heads affect millions of gm vehicles and loyal customers. Gm has issued a TSB and are aware of the issue at hand and in my, and many other customers this should have been a recalled item. I am calling on gm to fix this issue/mistake.