P1619 - Map Cooling Thermostat Control Circuit Signal Low

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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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