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I had major problems with my electric parking brake (2006 S Type Auto diesel). I appear to have resolved the situation completely by replacing the starter motor (SM) as previously reported. For some reason, my SM had gradually deteriorated and this resulted in extended cranking as it was taking some time to get up to speed, and this was draining the battery. This resulted in low voltage which affects the control unit for the EPB and other things. I replaced the SM (£150 plus fitting) and this made a very obvious difference to the cranking speed. I have also replaced my 90 AH battery with a 100 AH unit (same dimensions) and that has probably helped also. I have a plug-in voltmeter (e-bay or Amazon about £2) in the cigar lighter and this now rarely goes below 12.5V engine stopped, and after start up runs at about 15V although after about an hour of continuous running it will drop to 14V which I suspect indicates that the battery is fully charged. Since changing the SM I have done about 1,000 miles including lots of short runs which are obviously more challenging, and the problem, touch wood, appears to have been completely resolved. It is was not obvious that the SM had deteriorated so much, but the diference the new one has made is enormous. I have had the car since new and the deterioration had been so gradual that I had not noticed. If all else fails, I should try changing the SM.

Hi Kevin, at a guess Ebay would be a good bet for buying one. It is really simple to remove the old one and replace it with the very basic of tools it takes less than 20 minutes so even at garage rates it is not a big job. Hope you find it. Rick