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Not only is this a nuisance, but more often than not it has the more problematic consequence of immobilising the engine when power is restored.
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The Problem
In a standard vehicle (ie, one that hasn't had other electrical items added to it causing the drain), the number 1 cause of this problem is RF interference being picked up by the P38's remote fob receiver.
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- Unplug the antenna from the receiver. (Partial fix / improvement)
The idea here is to reduce the effective range of the receiver, thus cutting out the interference from reaching the car. While this might work if you are already some distance from the source, it is not that effective. The P38 receivers are very sensitive, and can pickup signals even when inside buildings. On the other hand, if your remote fob batteries aren't the strongest, you may find you then have to hold the fob right next to the rear window to operate, which can make the 'friendly sync' and mobilisation functionality on later P38s intermittent in operation. - Replace the receiver with an updated version. (Complete fix, if 3rd gen fitted)
Land Rover released two additional versions of the P38 receiver that were designed to tackle this problem. The second generation receiver was not much of an improvement on the first generation, merely adding some actual RF filtering to tighten the frequency range it worked upon somewhat. The third generation receiver however fixed the problem, as it employed some actual filtering of transmissions it sent on to the BeCM. This is part number YWY500170, retailing at approx £300 inc vat in the UK. - Add an aftermarket filter device to the existing receiver. (Complete fix)
A filtering device has been developed to emulate the functionality of the official third generation receiver, that is a plug and play installation using the original first or second generation receiver in the vehicle. These units retail for approx £80 inc vat in the UK. See below for more details. - Unplug the receiver entirely. (Fixes drain, loss of remote fob)
A final 'fix' to this problem could be considered unplugging the receiver entirely. This however will mean losing the remote fob functionality, and may actually cause issues with the engine immobilisation and alarm. The state of the door latches can also throw similar issues into the mix that may be avoidable with a functioning remote fob. Of course, these should be addressed either way if they are known to be problematic.
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