P1619 - Map Cooling Thermostat Control Circuit Signal Low


Hi
Can anyone tell me what the DTC P1619 - "Map Cooling Thermostat Control Circuit Signal Low" means on my 2001 E46 330ci?
Also, can anyone tell me what could cause it?
It has been to the dealers twice and an independant once with this fault, but neither have acted on it.
Many thanks
PP
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Pashlipops

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