Thread: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned

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  1. #1 Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
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    After installing new Overkill ECM/TCM on a 2008 Grand Prix GXP and a few rough starts, car "appears" to be running just great but I've been babying it due to the check engine light staying on.

    Read the code and this is the code I am getting. Searched threads, posts, etc but didn't locate anything. From what I've read on the web, a case re-learn should take care of this code?

    However, the local GM dealership won't do it without flashing the ECM back to stock. They won't allow the car to leave their facility with a tuned ECM.

    Currently struggling to find a shop that even has an idea of what I'm talking about. I'm confident in my car basic car knowledge but outside of purchasing a GM Tech 2 and doing it myself, I'm running short on options.

    Long story short, does the P0315 translate to a case learn requirement. I was going to do the re-learn regardless but wanted to see if they were one in the same and be educated before I went anywhere.
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  2. #2 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
    GTP Level Member FriboRage's Avatar
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    This is a common and expected thing that happens with any replacement PCM. Will even writes about it in the packet he sends with his tunes, if he still sends them.

    Even if you get one from another company, this is still something that happens regularly, the PCM has to learn the "variation" in the crank position sensor on the motor so it can get the timing right.


    Look into an Aeroforce scan gauge under Gauges on zzperformance.com.

    It's about 250 dollars after shipping, but if you have a tuned GXP, that'll be really fun to have anyway. It's a scan gauge that gives you a ton of operating parameters including Knock, Intake Temps, Coolant temps, Ignition Advance, etc... full list is on the site. More to the point it can do a case learn, so it's a good investment in having a tuned vehicle and will help you do what you need to do on top of just being a cool gadget.

    Oh, it also reads and clears OBD II codes so you'll always have a code scanner with you too.

    As a 2008 you'll want to get the "CN" model gauge.
    --------------------------------------------------------------------------------
    2004 Grand Prix GTP Comp G: Intake, F+R plogs + downpipe, 1.7 YT Rollers, Overkill, F-body front brakes, drilled/slotted r1 concept rotors.
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  3. #3 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
    GXP Level Member darkhorizon's Avatar
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    you can just borrow something from someone if you want to do a case learn.
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  4. #4 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
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    Quote Originally Posted by FriboRage View Post
    This is a common and expected thing that happens with any replacement PCM. Will even writes about it in the packet he sends with his tunes, if he still sends them.

    Even if you get one from another company, this is still something that happens regularly, the PCM has to learn the "variation" in the crank position sensor on the motor so it can get the timing right.


    Look into an Aeroforce scan gauge under Gauges on zzperformance.com.

    It's about 250 dollars after shipping, but if you have a tuned GXP, that'll be really fun to have anyway. It's a scan gauge that gives you a ton of operating parameters including Knock, Intake Temps, Coolant temps, Ignition Advance, etc... full list is on the site. More to the point it can do a case learn, so it's a good investment in having a tuned vehicle and will help you do what you need to do on top of just being a cool gadget.

    Oh, it also reads and clears OBD II codes so you'll always have a code scanner with you too.

    As a 2008 you'll want to get the "CN" model gauge.
    Awesome information - you answered my curiosity about what programmer to look into. Local shop got the code cleared yesterday. Will didn't send any literature with my ECM/TCM. Stealership wouldn't do anything for me being it wasn't a stock ECM.

    Thanks again - big help!
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  5. #5  
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    Quote Originally Posted by FriboRage View Post
    This is a common and expected thing that happens with any replacement PCM. Will even writes about it in the packet he sends with his tunes, if he still sends them.

    Even if you get one from another company, this is still something that happens regularly, the PCM has to learn the "variation" in the crank position sensor on the motor so it can get the timing right.


    Look into an Aeroforce scan gauge under Gauges on zzperformance.com.

    It's about 250 dollars after shipping, but if you have a tuned GXP, that'll be really fun to have anyway. It's a scan gauge that gives you a ton of operating parameters including Knock, Intake Temps, Coolant temps, Ignition Advance, etc... full list is on the site. More to the point it can do a case learn, so it's a good investment in having a tuned vehicle and will help you do what you need to do on top of just being a cool gadget.

    Oh, it also reads and clears OBD II codes so you'll always have a code scanner with you too.

    As a 2008 you'll want to get the "CN" model gauge.
    Are u serious that the Aero force gauges can do case learns? I was planning to get a Aero force gauge with tax money but didn't know they could do case learns. But that'll work perfectly as i have a set of tuned ecm/tcm that will at overkill is retuning for my car and I'll need a relearn

    Sent from my DROID RAZR using Tapatalk 2
    http://www.grandprixforums.net/my-06-gp-gxp-72403.html
    OBX headers, TEP tranny cooler, ls1 IM fuel rails and injectors, ls2 TB, ls7 MAF, full custom exhaust, Quad retro headlights, full out front and rear suspension work, tuned by HPT by me 8====>

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  6. #6 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
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  7. #7 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
    GXP Level Member GTPpower's Avatar
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    Overkill>Diablo


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  8. #8 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
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    Quote Originally Posted by GTPpower View Post
    Overkill>Diablo
    As in Overkill is the devil?? Ha........
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  9. #9 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
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    Quote Originally Posted by 91parkave View Post
    So this gauge can scan AND program the ECM?
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  10. #10  
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    Well it can do small stuff. Read on their forum on the website and it'll answer all ur questions

    Sent from my DROID RAZR using Tapatalk 2
    http://www.grandprixforums.net/my-06-gp-gxp-72403.html
    OBX headers, TEP tranny cooler, ls1 IM fuel rails and injectors, ls2 TB, ls7 MAF, full custom exhaust, Quad retro headlights, full out front and rear suspension work, tuned by HPT by me 8====>

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  11. #11 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
    GTP Level Member FriboRage's Avatar
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    Quote Originally Posted by rideus View Post
    As in Overkill is the devil?? Ha........
    No, this is read as, "Overkill is greater than Diablo." The symbol ">" stands for " is greater than", is typically used in math to show that one number or expression is larger than another.

    This is opposed to the " is equal to" sign "=" which would state that something is the same or "equal" to another.

    An easy way to remember it is that the > sign is a crocodile and it wants to "eat" the greater meal, it wants "more" food, so the open end or it's mouth is always pointed to the bigger one. If you flip it around, it reads "is less than" and is pretty self explanitory.

    The = sign is memorable because it depicts exactly what it means, 2 lines that are the same size and length, they are "equal"

    -----------------------------------
    So this gauge can scan AND program the ECM?
    On our cars, it can perform a case learn, turn the engine fans on/off on demand, and reset fuel trims.

    Other than that it really just scans almost everything. You cant tune with it or anything advanced like that.
    --------------------------------------------------------------------------------
    2004 Grand Prix GTP Comp G: Intake, F+R plogs + downpipe, 1.7 YT Rollers, Overkill, F-body front brakes, drilled/slotted r1 concept rotors.
    Sport Edition Kv5 18x8
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  12. #12  
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    Quote Originally Posted by FriboRage View Post
    No, this is read as, "Overkill is greater than Diablo." The symbol ">" stands for " is greater than", is typically used in math to show that one number or expression is larger than another.

    This is opposed to the " is equal to" sign "=" which would state that something is the same or "equal"

    -----------------------------------


    On our cars, it can perform a case learn, turn the engine fans on/off on demand, and reset fuel trims.

    Other than that it really just scans almost everything. You cant tune with it or anything advanced like that.
    U by chance know if it can do the case learn on a 06 gxp

    Sent from my DROID RAZR using Tapatalk 2
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    OBX headers, TEP tranny cooler, ls1 IM fuel rails and injectors, ls2 TB, ls7 MAF, full custom exhaust, Quad retro headlights, full out front and rear suspension work, tuned by HPT by me 8====>

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  13. #13 Re: Overkill ECM/TCM - P0315 - Crankshaft Position System Variation Not Learned 
    GTP Level Member FriboRage's Avatar
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    Quote Originally Posted by marines542 View Post
    U by chance know if it can do the case learn on a 06 gxp

    Sent from my DROID RAZR using Tapatalk 2
    Yes, here is the feature guide, as well as the user manual

    http://www.aeroforcetech.com/files/p...s_features.pdf
    Aeroforce Technology Inc | Interceptor Manuals

    You'll want to pick the most recent version of the "CN" gauge I believe, or the one for "CAN" vehicles, it's written both ways in different places.
    --------------------------------------------------------------------------------
    2004 Grand Prix GTP Comp G: Intake, F+R plogs + downpipe, 1.7 YT Rollers, Overkill, F-body front brakes, drilled/slotted r1 concept rotors.
    Sport Edition Kv5 18x8
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  14. #14  
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    Awesome bro for the info. I've read on the aeroforce forum but couldn't find specifics on it.

    Sent from my DROID RAZR using Tapatalk 2
    http://www.grandprixforums.net/my-06-gp-gxp-72403.html
    OBX headers, TEP tranny cooler, ls1 IM fuel rails and injectors, ls2 TB, ls7 MAF, full custom exhaust, Quad retro headlights, full out front and rear suspension work, tuned by HPT by me 8====>

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