06 Trailblazer EXT v6 multiple codes keep reocurring
NOT Solved! Why do I have to select a prefix, but the only one is 'Solved'? Odd.
I hope someone can give me some ideas, I'm at my wit's end with this. The engine light in out trailblazer keeps coming on and going off. Each time it comes on it's the same 4 codes P0014, P0171, P0455, P0496. I've already changed the valve timing solenoid (did make it run smoother) the vent solenoid, the purge valve and changed the gas cap twice. I also ran a can of fuel line cleaner through it. The light went off for a while, now it's intermittent, but mostly on. We're 2 months out of inspection and it won't pass with the light on in NY. Every time we get near the mechanics to complete the inspection the dam light comes back on! The thing is there are no issues with how the vehicle runs. It idles smooth, has great power and never hesitates. I've checked the codes as soon as the light comes on and it's always all 4, so I have to believe that there is some common issue causing all 4, but they don't seem to be related in any way. Can anyone help?