When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have a 2008 Base. Rear mount s476, methanol, TSP Boosted stg 3 cam, BTR valve train and thats about it for the big stuff.
I few days ago I was on a trip about an hour out. On the way back after some short lived spirited driving the CEL for P0016 came on. Car runs and drives like nothings wrong, still makes boost (I haven't pushed it hard at all), but it idles up and down.
Since then I have replaced the cam sensor and that helped the awkward idle but the CEL came back.
I assume it's the crank sensor, but I wanted to as you guys before I go to replacing anything else.
C5’er here but you really need to scope your cam/crank sensors to actually see what’s going on...yes, it can be a cam or crank sensor or even a worn timing chain... if the chain had skipped a tooth or installed one tooth off it would probably be running poorly !!... here is a cam/crank correlation on my 2001 (LS1)...my crank sensor is a 24X and cam a 1X as you can see here...you basically have to compare how the cam sensor waveform lines up to the crank !!...oh, BTW if you changed that cam sensor you should do a crank variation relearn...Tech 2 or a bi- directional scan tool needed for this !!
C5’er here but you really need to scope your cam/crank sensors to actually see what’s going on...yes, it can be a cam or crank sensor or even a worn timing chain... if the chain had skipped a tooth or installed one tooth off it would probably be running poorly !!... here is a cam/crank correlation on my 2001 (LS1)...my crank sensor is a 24X and cam a 1X as you can see here...you basically have to compare how the cam sensor waveform lines up to the crank !!...oh, BTW if you changed that cam sensor you should do a crank variation relearn...Tech 2 or a bi- directional scan tool needed for this !!
I was thinking I needed to do the crank relearn but HP Tuners won't let me while there is a CEL. I'll have to try it with my other scan tool when I get home.
I don't own a scope either; where did you have this done?
I was thinking I needed to do the crank relearn but HP Tuners won't let me while there is a CEL. I'll have to try it with my other scan tool when I get home.
I don't own a scope either; where did you have this done?
I have my own scope (Picoscope) but any diagnostic shop should be able to do it for you !!...takes about 30 minutes..,you just have to back probe cam and crank sensor signal wires at the PCM...easy peezy !!
I have my own scope (Picoscope) but any diagnostic shop should be able to do it for you !!...takes about 30 minutes..,you just have to back probe cam and crank sensor signal wires at the PCM...easy peezy !!
Sweet.. I will definitely be checking around here.
This P0016 code is a cam/crank correlation code. I would doubt a dead sensor could cause this, it is a logic concern, not a circuit or sensor concern. I could see needing to do a crank relearn if the engine was just built, but for it to just randomly set this DTC out of the blue? It doesn't "forget" where the crank is, so shouldn't need to relearn it like it's some sort of maintenance item. Scoping would give a good idea to see what the ECM is seeing, but considering you mentioned it ran fine, timing probably isn't off. My suspicion is the reluctor wheel spun on the crankshaft, considering it is just pressed on.
This P0016 code is a cam/crank correlation code. I would doubt a dead sensor could cause this, it is a logic concern, not a circuit or sensor concern. I could see needing to do a crank relearn if the engine was just built, but for it to just randomly set this DTC out of the blue? It doesn't "forget" where the crank is, so shouldn't need to relearn it like it's some sort of maintenance item. Scoping would give a good idea to see what the ECM is seeing, but considering you mentioned it ran fine, timing probably isn't off. My suspicion is the reluctor wheel spun on the crankshaft, considering it is just pressed on.
You're not the first person to suggest that. I've got to pull the motor anyway so I will definitely be checking that. Is there a way to prevent that thing from spinning like that or what causes it to spin in the first place?
P0016 Woes
