Went to gmc dealer because truck has a transmission oil leak. Technician noted that all three transmission oil cooler line are leaking. According to internet forum (http://dieselplace.com/forum/showthread.php?t=202078), this is a know defect on the 2006 silverado and sierra trucks equipped with diesel engine and allison automatic transmission. Several owners have had 2 or more incidents. Replacement lines are no better than the originals. I am an engineer and have been involved in vehicle fire investigations in the past, some were caused by leaking transmission cooler lines dripping on hot exhaust pipes and manifolds. This is a potential fire hazard! This requires a new design for these transmission oil cooler lines.
2006 GMC Sierra 2500 transmission complaints
Page 2 of 2: complaints 11 to 12 of 12, newest first, as owners wrote them.
I have a 2006 gmc sierra that has had transmission lines replaced and that keep having to be replaced because of hose leaking every year.
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