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Hot!PCM2 showing wrong date

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minny
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minny PCGB Member
2019/09/15 11:44:45 (permalink)

PCM2 showing wrong date

The date on my 2004 996 turbo PCM2 is wrong and i cannot correct it even with a PIWIS or PST 2. The problem started about a year ago when the date would sometimes not show when the unit was on and would either appear later or if I pushed the 1, 4 and 8 buttons together to soft reset the system. The problem then recurred when I re-started the car later. 
 
However, over the last 2 months, this is no longer an issue in that the date is showing all the time as it should except it started on 01/01/2000. I am now on 26/02/2000 and I used the PIWIS and PST 2 to try to code the date in the MMI module but it didn't even change. When I did it in the Navigation module, it corrects on the screen for 10 seconds then reverts to the pre-corrected date. 
 
Any advice would really be appreciated if anyone else has had the same problem and how to correct it.
 

Is: 996 turbo Tiptronic and C63 estate
Was: 996 Carrera Tiptronic

8 Replies Related Threads

    Richard_Hamilton
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    Richard_Hamilton PCGB Member
    Re: PCM2 showing wrong date 2019/09/15 12:47:23 (permalink)
    Lots of reports of this on PCM2.1 (9x7 cars).  One possibility is the GPS "Millennium Bug" desribed here: https://thenextweb.com/te...-problem-of-their-own/

    Richard
    1989 3.2 Carrera Sport in Guards Red/Linen & Audi RSQ3
    Previous:
    2012 Cayman 2.9 PDK, 2006 Cayman S, 2000 996 Turbo, 1998 996 C2, 1994 993 C2
    minny
    PCGB Member
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    minny PCGB Member
    Re: PCM2 showing wrong date 2019/09/15 17:06:21 (permalink)
    Thank you. On other forums, there are reports that trying to recode the PCM by parking the car in a garage then leaving unlocked overnight may work as the car cannot receive a GPS signal and somehow the new date sticks. I may try it at some point when I get round to it.

    Is: 996 turbo Tiptronic and C63 estate
    Was: 996 Carrera Tiptronic
    Steve_996_4S
    PCGB Member
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    Steve_996_4S PCGB Member
    Re: PCM2 showing wrong date 2019/09/15 18:18:28 (permalink)
    I have exactly the same problem. I was told to leave the car unlocked, engine off but ignition on for a couple of hours in an open space. Was told that PCM2 will reset to current date once it has received new data from the GPS satellites. Tried this on my driveway, with car blocked in for security, but did not work.
    I will try the suggestion to leave it in my garage unlocked overnight and see if that works.  

    Steve Bourne
    Porsche 996 4S
    Guards Red, Sports Exhaust, Quick shift,
    Sports Seats, Xenons, TechArt Rear Spoiler, Aero Kit Front Spoiler, Sat Nav, 6 CD, Full Grey Leather, Carbon Kit, White Dial Conversion, Colour Coded Seat Backs and Centre Console
    mbaxterjones
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    mbaxterjones PCGB Member
    Re: PCM2 showing wrong date 2019/09/15 19:15:10 (permalink)
    I have the same issue with my car. Left it unlocked in the garage and that hasn’t helped, any other advice would be appreciated 
    minny
    PCGB Member
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    minny PCGB Member
    Re: PCM2 showing wrong date 2019/09/15 20:11:00 (permalink)
    From what I can glean from others' success, it seems to work if you have coded the PCM with the PIWIS or PST2 while the car is hidden from the GPS signal e.g in a garage and leaving the car unlocked for a day or two. I don't think just leaving it unlocked in the garage would work.

    Is: 996 turbo Tiptronic and C63 estate
    Was: 996 Carrera Tiptronic
    wibble
    PCGB Member
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    wibble PCGB Member
    Re: PCM2 showing wrong date 2019/09/16 16:33:31 (permalink)
    This sounds like a firmware issue or a standby battery fault on the PCM (common fault on old computer devices). Most units that have a memory will require a standby battery (e.g. LR44) to keep it active in the event main power is lost, such as a car battery in this case. If either loses power then the memory will erase and default to factory settings. A remote key fob would be another example. 
     
    I suspect a similar issue is being experienced here. Without taking PCM apart it is difficult to diagnose without seeing the circuit, but pretty sure one of our US cousins on rennlist will have done it.  The millennium bug is firmware and would require memory to be flashed to the latest version - I would have thought this would have been a routine fix during a service? Being proprietary units this may prove to be difficult to fix without cooperation from the manufacturer or those in the know. 

    Tony
    1999 996 Carrera 4 - Ocean Blue
    Past:
    1990 944 Turbo - Guards Red
    D911ARK
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    D911ARK PCGB Member
    Re: PCM2 showing wrong date 2019/09/18 10:24:32 (permalink)
    Weirdly, I was coming on here asking how to set the date, as mine has been incorrect for a while now, and thought I'd done something. It's not a big issue, but it is bloody annoying, as now all I see is the year 2000, and how I wish I was 19 years younger

    Mark
    996 C4S Cab Arctic Silver
    minny
    PCGB Member
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    minny PCGB Member
    Re: PCM2 showing wrong date 2019/09/18 14:49:04 (permalink)
    I tried coding the car in the garage so that it wouldn't pick up a GPS signal but have been unsuccessful. I can change the date on the PIWIS and the car momentarily accepts it then revers to 02.02.2000. Guess I'll just have to live with it. Annoying but its a first world problem really. 

    Is: 996 turbo Tiptronic and C63 estate
    Was: 996 Carrera Tiptronic
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