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45 minutes ago, JOHNMCC said:

2009 997.2  DTC DME CODE P1484 

 

Tank leakage diagnostic module has reached upper limit.

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Thank you, does that indicate that the module needs to be replaced?

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Just now, JOHNMCC said:

Thank you, does that indicate that the module needs to be replaced?

 

No, it means the fuel system is over pressuring at the tank, indicating an EVAP system fault.

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I got the same code today.  From my research, looks like the Leak Detection Module is throwing the code.  How do you test if the Leak Detection Module is actually faulty or is something else causing the Leak Detection Module to throw the code?  

 

Is there a DIY to replace the module on a 997.2?  

I cleared the code for now and hope that it does not return.  

 

Any info will be greatly appreciated.  

Thanks!

 

 

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40 minutes ago, VicL said:

I got the same code today.  From my research, looks like the Leak Detection Module is throwing the code.  How do you test if the Leak Detection Module is actually faulty or is something else causing the Leak Detection Module to throw the code?  

 

Is there a DIY to replace the module on a 997.2?  

I cleared the code for now and hope that it does not return.  

 

Any info will be greatly appreciated.  

Thanks!

 

 

 

As noted above, P1484 is an indication of high pressure in the EVAP system, an indication that the EVAP system is not working correctly; it does not necessarily mean you should change out a $300+ module until you have determined that it is actually bad.  The EVAP system is supposed to get rid of excess fuel vapor into the intake system to burn it off, the leak detection module periodically tests the EVAP system to make sure it is not leaking.  The code indicates that the EVAP system pressure is too high, which may be the module, but often is not.

 

The normal way of testing the module is with a smoke test unit to make sure it is closed when it is supposed to be.  The attached is the function diagram for the same module on a BMW; as they all work the same way, this should help you understand how this unit functions:

 

How the leak detection module functions

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I first replaced my filler cap since it was the cheapest part.  Code came back.  I then replaced the Leak Detection Pump with this OEM Bosch for $63.58.  2 tanks of gas and code has not come back.  The OEM Bosch was exactly the same as the one with that came on the car.  Plug and play.  The hardest part of the replacement was removing the vapor canister cover. 

 

WWW.PARTSGEEK.COM

Buy a 2009 Porsche 911 Leak Detection Pump at discount prices. Choose top quality brands Bosch, Dorman, Genuine.

 

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