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Crankshaft Re-learn

jgold121

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jgold121 Enthusiast

jgold121

Posted
Posted

So I've had my Blackbear tune installed for about a month, and just last night, the check engine light came on. Took it the parts house, and they read it as the code calling for a crankshaft re-learn. My question is, will it harm anything if I can't get around to taking it in to get a re-learn until next weekend? Or should I swap the stock computers back in?

 

This might be a dumb question, but I just don't want to tear anything up.

 

It also seems like I might have a little bit of reduced power now that the code has been thrown. Would that make sense?

 

Thanks for your help, guys!

 

-jG

jgold121 Enthusiast

jgold121

Posted
  • Author
Posted
Have you tried to do the crank relearn again yourself?

 

 

I was under the impression that I either needed EFILive or a TechII. Neither of which I have immediate access to. But Justin is going to be about 50miles away from me next weekend.

 

Is it possible to do it another way?

bigredmariner Senior Enthusiast

bigredmariner

Posted
Posted
Have you tried to do the crank relearn again yourself?

 

 

I was under the impression that I either needed EFILive or a TechII. Neither of which I have immediate access to. But Justin is going to be about 50miles away from me next weekend.

 

Is it possible to do it another way?

 

 

I'm not 100% sure but I did my crank relearn in the driveway for my '06 after I got my tuned PCM back from Justin. Did you have to do anything like that for yours? I'll do some searching and see what I can find on the procedure.

jgold121 Enthusiast

jgold121

Posted
  • Author
Posted
Have you tried to do the crank relearn again yourself?

 

 

I was under the impression that I either needed EFILive or a TechII. Neither of which I have immediate access to. But Justin is going to be about 50miles away from me next weekend.

 

Is it possible to do it another way?

 

 

I'm not 100% sure but I did my crank relearn in the driveway for my '06 after I got my tuned PCM back from Justin. Did you have to do anything like that for yours? I'll do some searching and see what I can find on the procedure.

 

 

Well---there was a security re-learn that was mentioned when the new ECM was shipped...something to do with cycling the key on/off several times and watching for the anti-theft light on the cluster to go dim. That was the only learn I knew of---but I really didn't even have to do that.

bigredmariner Senior Enthusiast

bigredmariner

Posted
Posted
Have you tried to do the crank relearn again yourself?

 

 

I was under the impression that I either needed EFILive or a TechII. Neither of which I have immediate access to. But Justin is going to be about 50miles away from me next weekend.

 

Is it possible to do it another way?

 

 

I'm not 100% sure but I did my crank relearn in the driveway for my '06 after I got my tuned PCM back from Justin. Did you have to do anything like that for yours? I'll do some searching and see what I can find on the procedure.

 

 

Well---there was a security re-learn that was mentioned when the new ECM was shipped...something to do with cycling the key on/off several times and watching for the anti-theft light on the cluster to go dim. That was the only learn I knew of---but I really didn't even have to do that.

 

 

PM sent.

cerbomark Senior Enthusiast

cerbomark

Posted
Posted
Have you tried to do the crank relearn again yourself?

 

 

I was under the impression that I either needed EFILive or a TechII. Neither of which I have immediate access to. But Justin is going to be about 50miles away from me next weekend.

 

Is it possible to do it another way?

 

 

Correct. It will not hurt anything. Drive it till next week and then get it done. I even had a dealer do it for me once ( no questions asked, takes about a minute)..

dlewis1111 Senior Enthusiast

dlewis1111

Posted
Posted
Have you tried to do the crank relearn again yourself?

 

 

I was under the impression that I either needed EFILive or a TechII. Neither of which I have immediate access to. But Justin is going to be about 50miles away from me next weekend.

 

Is it possible to do it another way?

 

 

Correct. It will not hurt anything. Drive it till next week and then get it done. I even had a dealer do it for me once ( no questions asked, takes about a minute)..

 

 

So when you get a computer from Justin, you can drive without doing the relearn? Now I am confused....

2k8Vmax Enthusiast

2k8Vmax

Posted
Posted

there is a security relearn and a crank relearn, two completely diff. things. Justin will try to match a computer as close as he can to your VIN to minimize having to do a security relearn. I didn't have to do the security learn at all, but i thought that everyone would have to do the crank relearn. It sets the camshaft positioning sensor to the new computer. Otherwise the computer thinks it's missfiring. That's how it was explained to me and it makes sense. I didn't notice any performance difference after having it done. You would need EFILive, HP Tuners, or a GM TechII to do the crank relearn.

cerbomark Senior Enthusiast

cerbomark

Posted
Posted
Have you tried to do the crank relearn again yourself?

 

 

I was under the impression that I either needed EFILive or a TechII. Neither of which I have immediate access to. But Justin is going to be about 50miles away from me next weekend.

 

Is it possible to do it another way?

 

 

Correct. It will not hurt anything. Drive it till next week and then get it done. I even had a dealer do it for me once ( no questions asked, takes about a minute)..

 

 

So when you get a computer from Justin, you can drive without doing the relearn? Now I am confused....

 

 

You will need to do the rel earn cause it ma not run as well as it could but you won t damage anything by driving it until you get the relearn done. A lot of people have driven a lot of miles without having it done right away with no issues.

Jennabear Senior Enthusiast

Jennabear

Posted
Posted
Have you tried to do the crank relearn again yourself?

 

 

I'm not 100% sure but I did my crank relearn in the driveway for my '06 after I got my tuned PCM back from Justin. Did you have to do anything like that for yours? I'll do some searching and see what I can find on the procedure.

 

 

What you are talking about is the security relearn.

Like everyone else has said, there are two different relearns, a security relearn (can be done by the customer) and a crank relearn (need to be done with EFILive, Tech II or the like).

 

You can drive around without a crank relearn no problem (other than the light being on) however, we encourage our customers to go and get it done. I would suggest calling a few mechanics and seeing if they have a tool to perform the relearn.

Ahsmo Enthusiast

Ahsmo

Posted
Posted

I tried calling the dealerships and hassling the service managers but they kept saying I needed to get my check engine light diagnosed for $98.

 

When I finally found someone with a tech 2, they didn't follow the directions on the screen and said my tune was bad and Justin didn't know what he was doing. The name of the shop is Vetttech in West Houston in case anyone googles this thread. They are very rude.

 

After Justin told me to make sure they follow directions, I found a shop that did it.

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