My in-laws have an 07 Suburban with a 5.3l. A couple months ago we rode with them to the beach and everything was good until we got nearly back home. It started having a misfire at idle randomly. It has been doing that ever since but still running fairly well besides that.

On thanksgiving day they took it on a little trip and it shut off on them. My father in-law said it sounded like a diesel for a second and then shut off.

They had it towed back home and I was able to check the codes this morning and it's showing p0016.

It says "crankshaft position-camshaft position correlation bank 1 sensor A."

It will turn over and it sounds like a cylinder or two might be trying to fire but it will not start.

Maybe needs a new Crank position sensor and a relearn? They have another vehicle to drive so it's not an emergency but I'd like to fix it for them so they don't have to pay somebody.

Thanks,
Joey

 

I forgot to ask, but if we end up changing the crank position sensor and/or cam position sensor do we need to have a crank relearn done anway

Joey

 

Ummm dumb question do you have or have access to a lab scope??

 

No, I'm not sure I even know what that is.

 

To answer this question, Yes.

 

Lab scope is another name for an oscilloscope, youd be able to see actual cam/crank signals and correlation.... But its a mute point if you dont have( or have access to) one.....

Brick, i thought they relearned themselves automatically when you cranked the engine??!! Maybe thats older gm's..... Havent seen too many cam/crank sensors go bad on gm, usually fords nissans and chryslers i see crank/cam sensor problems on... Not to say its not unheard of but kinda rare...

OP is this a nnbs suburban..... Could be broken timing chain tensioner, or sonething goin on with chain.....if you can "borrow" good known sensors i would go that route first though before tearing into the engine.......

 

No. They have a small window they can operate in but outside of that it should always be relearned for any variances. Too much and it will throw a code and or possibly run bad.

Hence the reason they put the relearn feature in the scan tool software. They now have a feature in some of the tuning software to copy over the learned data when flashing a tune.

I haven't seen very many fail either. I would also suspect a mechanical issue of sort.

 

Maybe its just older gms that relearned themselves then...

 

Hey guys he's been busy this week working, but said he just swapped the Crank position sensor. Still won't start. I'm sorry I know I'm not much help I've never been inside one of these engines (yet) and I know it's even harder to diagnose something over a computer.

I assumed if the crank/cam sensor was the problem it would run if they were changed, and then get the relearn after. I was just thinking maybe something happened with the timing chain but I've never heard of one breaking. I don't know if this helps any, but this thing does have AFM and burns a good bit of oil.

 

Need to do a compression test, and you may end up going inside the engine, the gen 4 engines are known for oil consumption isues and with dod collapsed lifters.....