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What is your question?
My mechanic says there's no problem and the next time I turn it on it runs fine.
What makes this problem better or worse?
when I haven't driven it for a few days
How long has your 2006 Jaguar XJ8 had this problem?
A few days
1 Reply
Hi, I'm one of the auto experts on RepairPal's Car Genius team! On your 2006 Jaguar XJ8, an intermittent gearbox fault message that clears on its own can definitely be frustrating but is something worth paying attention to, even if it seems to resolve itself. Jaguars from this era are known for being a bit sensitive when it comes to their electrical systems, and an intermittent fault like this can be caused by several different things. It could be related to the transmission control module itself, a weak or aging battery causing voltage drops that confuse the transmission control module, a dirty or failing transmission range sensor, or early signs of a solenoid issue inside the transmission. The tricky thing with intermittent faults is that they often don't leave a stored code behind, which can make them harder to diagnose, and may explain why your mechanic isn't seeing anything obvious. It is possible that you will need to wait for it to get worse before it is possible to diagnose it, however I’d suggest finding a shop that has experience with Jaguar vehicles specifically, as their diagnostic systems can be a bit more involved than your average vehicle. It would also be worth having the battery tested thoroughly, as a weak battery is often an overlooked cause of all kinds of electronic gremlins on luxury vehicles. If you need any further advice or would like help finding a trusted RepairPal shop in your area or even getting an appointment booked, please feel free to call us at 877-913-1554