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Thread: XK8 intermittent electrical faults

  1. #1
    Member noizyboy's Avatar
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    XK8 intermittent electrical faults

    Worst scenario, on the M25 and all of a sudden error codes flashed on - gearbox fault, DCS fault, limp mode, etc. Speedo, Tacho, temp gauge all fall to zero, no air con, or climate control. Car is running fine so I continue to drive to Fleet services. Turn off the engine and wait a while. Try to start again and nothing. Call out the RAC and he tests the battery, test all the fuses ok, checks the fuse box at the front LHS. Unplugs and removes the fuse box checks all the cabling. Ref it's the fuse box and the car starts fine but I can't get it in drive. So decides to recover back the an independent Jag garage I have used for many years. Now the car starts and runs fine. Any ideas?
    4.2 XK8 2004 & 2016 F-Type V6S

  2. #2
    Senior Member rchiv's Avatar
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    What did the garage do then.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 106K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
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  3. #3
    Member noizyboy's Avatar
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    Nothing it started fine after recovery. They checked the codes which were numerous.
    4.2 XK8 2004 & 2016 F-Type V6S

  4. #4
    Senior Member rchiv's Avatar
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    Sounds like it's battery related then.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 106K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

  5. #5
    Member noizyboy's Avatar
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    Nope battery fine. RAC even tried the boost before recovering.
    4.2 XK8 2004 & 2016 F-Type V6S

  6. #6
    Senior Member rchiv's Avatar
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    Then the codes should point to something amiss. Do you know what they were.

    Roger
    HEY I THOUGHT I HAD RETIRED, Ex Auto Electrician
    2006 X Type 2.2d SE Manual Estate. Zurcon Blue Champagne/Mocca, F/R Parking sensors, ,Auto Lights, Auto Wipers, Headlight Washers, Sat Nav 2012 update, 17 in Wheels, 106K Mods:- Electric Autofold Mirrors on Locking , HID Dip Beams
    Simple Autofold Mirrors on Locking,http://www.jaguarforum.com/showthrea...irrors+locking
    UPDATE YOUR SIGNATURE http://www.jaguarforum.com/showthread.php?t=91945

  7. #7
    Senior Member Jimbov8's Avatar
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    I would say there is a loose connection on the fuse box that was removed. Would be very wise to check all main positive and ground points for security and cleanliness.
    Jim.
    2009 XK 5.0L PortfolioPast:-87'XJS 3.6L, 93'XJ40 3.2L gold, 95'XJ6 4.0L sport, 00'XJ8 3.2L sport, 2005 XK8 4.2L coupe in that order and enjoyed all of 'em.

    I do not offer advice, I only say what I would do with the set of circumstances presented. Your choice always.

  8. #8
    Senior Member frankc's Avatar
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    +1 for the battery connection. Especially the Earth. If you have a bad earth it can lead to all sorts of interesting problems. Years ago in my Escort days I had an intermittent bad earth. One of the more interesting things it did was blast the horn and put the headlights on when I braked. Became rather tense when I had to brake hard behind so dodgy looking motorbikes at a level crossing.
    2003 Zircon Blue XKR Convertible.
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  10. #9
    Member noizyboy's Avatar
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    Many thanks for your comments. There were so many fault codes it didn't really tell anything. All obvious earth connections checked including the braided cable that connects the gearbox to the chassis. Still no closer to finding the issue, especially as the car is running perfectly! Just feel nervous going on a long run.
    4.2 XK8 2004 & 2016 F-Type V6S

  11. #10
    Senior Member astromorg's Avatar
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    The positive lead from the battery should go directly to the high power protection module (posh name for a high current fuse box), at the front of the spare wheel well. Check for loose/dirty connections there. They're not uncommon.
    2005 XK8 4.2-S Coupe and 2005 Auto SE 2.5 X Type Saloon

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