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2011 2500hd 6.0 misfire


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  • 2 weeks later...

ok this 2011 2500hd is pissing me off im at a loss im the guy every one brings vehicles to when they cant figure it out this one has me stumped  Iv been doing this for 22 years and have never installed a transmission and then had electrical or fuel issues has anyone figured this out 

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1 hour ago, lnb said:

ok this 2011 2500hd is pissing me off im at a loss im the guy every one brings vehicles to when they cant figure it out this one has me stumped  Iv been doing this for 22 years and have never installed a transmission and then had electrical or fuel issues has anyone figured this out 

Yep same issue. My father has been an ASE master Tech for more then 30 years. Cannot figure it out to save our lives. I’ve replaced everything I could even think about and nothing has worked. I have no idea what it could possibly be. 

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It has to be some form of sensor issue but I can’t figure it out. I’ve checked wiring between everything and even grounded the computer and still nothing. I don’t understand how out of no where it started this and no matter what I have done or tried it doesn’t fix it 

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13 hours ago, casey.mikl said:

It has to be some form of sensor issue but I can’t figure it out. I’ve checked wiring between everything and even grounded the computer and still nothing. I don’t understand how out of no where it started this and no matter what I have done or tried it doesn’t fix it 

Parts wear.  Connections rust.  Heat cycles make gaskets fail.  It's a 10 year old truck that's gone through it all.  Somewhere there's an air leak and/or a poor electrical connection and/or a failing sensor, and/or a failing/dirty fuel injector, that either alone or together are causing the problem.

 

Perhaps start with methodically going through the diagnosis tables in the full-service manual from GM for your vehicle...

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OK UPDATE check the harness and plug that goes to the transmission if its broke or damaged in anyway replace it also look at the back of the plug for pins that may be backed out even just a little bit it will cause all kinds of stupid problems the rubber that keeps moisture from entering and keeps the pins held in should be seated all the way in the hole none of the rubber should be sticking out it should be flush or inset in its hole 

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1 hour ago, lnb said:

OK UPDATE check the harness and plug that goes to the transmission if its broke or damaged in anyway replace it also look at the back of the plug for pins that may be backed out even just a little bit it will cause all kinds of stupid problems the rubber that keeps moisture from entering and keeps the pins held in should be seated all the way in the hole none of the rubber should be sticking out it should be flush or inset in its hole 

Did this fix your issue? That could make sense, the transmission was rebuilt and it did not start up for a while after. The plug may not have been fully seated and backed off a tad causing intermittent connection issues. 

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