Hello first time on here.
I have a 06 gmc sierra 2wd WT 4.3. Was driving and it just died. Now it doesn't start. Just cranks and cranks and will back fire out of intake. I changed icm and did same thing. I changed cap and rotor wires and plugs. Same thing. They needed changed anyways.
Tested codes. Have the following codes
P00053 ho2 bank 1 sensor 1
P00054 ho2 bank 1 sensor 2
P00059 ho2 bank 2 sensor 1
P00060 ho2 bank 2 sensor 2
Also have P00449 which I think is gas cap.
Did fuel pressure test and I get 54psi at check point when the engine is turning over. Also holds there really good/no fall off.
Please help not sure what to do next
Could it be doing this with just low fuel pressure?
