Chrysler P0633 code and its consequences (SKIM delete function)

Philip Educator Hemet, California Posted   Latest  
Question
Programming
2006 Chrysler PT Cruiser 2.4L (B) 4-spd (40TE)
P0633 - Immobilizer Key Not Programmed - ECM/PCM

Friends,

The vehicle listed is merely representative. I don't see a way to post without a vehicle and this is my first post. I'm attempting to understand more about the Chrysler code P0633 "Secret Key not learned" code which appears after installing a PCM without having either a SKIM pin or lacking the tool to write the pin code in the WCM. The code seems harmless enough; the vehicle starts and runs and the MIL is not on. I have not heard of the code causing the failure of a California Smog Inspection. Chrysler has a TSB that glibly states "After performing this procedure with an after-market scan tool on vehicles equipped with Chrysler Group's Next Generation Controller (NGC), Diagnostic Trouble Code (DTC) “P0633 - SKIM SECRET KEY DATA NOT STORED IN PCM” will be set. This DTC will not effect vehicle or system performance and cannot be erased."

Trouble is, I suspect that the security system has indeed been compromised. In other words, my guess is that said vehicle will start with a black (non-transponder) key cut to the proper ignition. If I'm wrong, will someone please explain to me how this works? If there is no handshake, or there is a failed handshake with the PCM and the SKIM module, why does it start and run with no anti-theft concern?

+1
Tom Engineer
Claremont, California
Tom Default
 

Hi Philip, You can post without a vehicle if your message doesn't pertain to a vehicle, just leave the Vehicle field blank. If you'd like, you can edit your message and remove it.

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Philip Educator
Hemet, California
Philip Default
 

Thanks, Tom. I appreciate the update. I'll let the vehicle stay as representative.

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Dean Owner
Albany, New York
Dean Default
 

Phil, I have been told, this code may appear when a Chrysler factory reman. PCM is used. I was told it is the result of Chrysler using both skim and non skim PCM's in the reman process. I am told they do not differentiate between the two. They all get the same process, regardless if skim is present. Not sure what, and how it works, but I have also ran across this code, but only with a reman…

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Walter Mobile Technician
Plantation, Florida
Walter Default
 

This fault code will only appears when not using wiTECH to preform the PCM replacement function. Using the Jbox app to replace the PCM you will get this fault. Last you will not get this fault if you install a used PCM that has the VIN edited. Only the VIN needs editing on a used PCM to make it plug and play. I could be wrong but it's my understanding that the secret key data is not the PIN…

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Bruce Owner/Technician
San Antonio, Texas
Bruce Resolution
 

The risk that is run by writing a VIN to the ECM without properly setting it up with the PCM replaced function in the SKIM/SKREEM/WIN/IMMO has to do with what the "Secret key" really does. The "Secret Key" is a code string written to the immobilzer keys by the IMMO Module when they are originally programmed. By transferring this info to the PCM, the PCM becomes a back up for the keys…

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Helpful
Philip Educator
Hemet, California
Philip Default
 

Excellent response! Many thanks for the clarification because you cleared up the other issue; i.e., when do FOBIKs have to be replaced when replacing the WIN node! Maybe you could share your knowledge with DrewTech that gave me a generic response to my inquiry "Read the TSB that is linked in the J2534 Toolbox."

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Bruce Owner/Technician
San Antonio, Texas
Bruce Default
   

To be honest, even dealer techs do not understand the reason that some keys will reprogram and others will not. They are not fully trained on how these immobilzer systems function. I make a habit of checking mixed VINs if I am on a CAN FCA vehicle, with wiTech I can see if the PCM has a different VIN in the original VIN data read than the car. If I have that issue and the original WIN/SKREEM/WCM…

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