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Engine light came on and I used iCarscan to read. There are a few codes.


1. P025A00: Fuel Pump module activation, electrical fault/open circuit (inactive)

2. P164600: Fault, all-wheel drive electronics (inactive)


I clear the first two codes above but they keep coming back after a few days. Are those related to the fuel pump or are they related to oxygen sensor? If they are related to pump, why does the system give a P025A00 instead of P1025?


I also got a  89010E (alarm siren faulty) and C13112 (communication with alarm siren (rear 2). Both are active. Does it mean that I need to replace the siren alarm module?


Thanks in advance,



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My car is 2011 Porsche Cayenne V6 base model. The car starts and drives OK even with the codes come and go. The independent mechanics thought it is from one or  both of the two fuel pumps. But the code  is P025A00 instead of P1015.  


BTW, give to a little more background. In early May,  the car's engine came on first time and started to lose power during acceleration. Took the car to a shop. The mechanic replaced a bunch of parts including spark plugs and ignition coil. Took the car back from shop and symptoms returned on the next day. Took the car back to the shop. He then told me that the problem was with the high pressure fuel sensor. After the replacement, the car drives fine. Then after a couple of weeks, the engine light came back on. Took the car back to the shop. The codes are P025A00. But the car drives OK even when I switch on the sporty mode.  Mechanic told me that he believes it is related to fuel pump. But he is not sure whether it is HPFP or just base pump. He suggested me to replace both. He also said he needs more research even after replacing those two. But the codes disappeared after a few days. Then they came back. That is when I decided to buy a iCarScan and attempt to figure out and repair myself because I don't think that mechanic can diagnose this thing with confidence. 



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