I am posting this since there does not seem to be an easy resolution. We have a 2004 XJ8 VP in very nice condition with about 100,000 miles on it. The problem is that in cold weather, about 25 degrees or less, the car will not start. The starter motor will not engage, and codes of : gearbox fault, parking brake fault, ABS fault and DSC not available show when the codes are read. When the car becomes slightly warmer it will start and run perfectly. Now it is Sept, and there has been no problems since it is warm outside, however with cold weather around the corner I have to find a solution. My question to this group is; has anyone ever encountered this situation. I did call a couple of dealers and no one could recall such a problem - ideas would be appreciated. One friend who is alot more knowlegable on auto electronics thought it may be a module, there are many in this car. Since it is a cold weather problem, it cannot be really tested until maybe December. - Thank you

 

Check the battery voltage with a multi meter. It should be 12.5 or higher with the ignition off and I think 11.2 or higher when the starter is engaged. Have someone hold the gas pedal to the floor while engaging the starter so that it doesn't start.

If the battery is good there may be a bad connection to the battery cables or the engine to chassis ground strap.

 

You need to post your questions in the X350 section of the forum. (this is the X308)

 

Hi, Thank you - the battery was replaced as a precaution, voltage is fine, grounds were checked.