Peake Code keeps coming back '8C' looks like I'm going to replace the six month old thermostat. I'm assuming the heater circuit is bad again? If I understand correctly, the car will run slightly cooler in a manual mechanical mode without this circuit functioning correctly. Is there any other thing I may be overlooking? Fan is working, and I checked all conncections. Temp gage is at 12, code came back immediatly after resetting? Could Peake be wrong?thanks in advance99 540iA Sport.

The Peake codes are their reference to the actual OBD codes (or to BMW's extensions. Mtp Driver Cracked Tooth. I have no experience with Peake - but I assume that it is somehow set to the engine and model year that you have because the codes do change over time. Assuming that the code is correctly identified then it simply means that the DME is detecting some fault with that sensor circuit (getting a resistance reading that is out of normal parameters) or that the DME control circuit for the thermostat is itself defective.

Map thermostat, activation. I got the same code 2EF5- Map thermostat, activation. But my car has. Actually the code is 2EF7 map thermostat - activation. Download free software 2Ef7 Map Thermostat Activation. 8/21/2016 0 Comments. 2EF7 code, help please. I have this code 2EF7 map thermostat activation. Map Thermostat Activation Map controlled thermostat circuit/control code - Bimmerfest Few things about the thermostat (map one). The control of the engine cooling. I have this code 2EF7 map thermostat activation, I am not sure if I have to replace the thermostat as I replaced it less than a year ago. 2EF7 - Map Thermostat, activation 2A99 Crankshaft-exhaust camshaft, reference 30EA DeNox catalyctic converter, suphurized Ik heb een en ander al aan de auto vervangen.

You are NOT correct about the affect. Your engine normally operates at about 108C - where it is most efficient. Under heavy engine loads, or if the coolant temp goes above about 118C then the DME will activate the heater in the thermostat so that it fools it and therefore it opens earlier to lower the temperature. So basically your overheat protection is not working.

Your temp guage is buffered to stay at the vertical unless the temp gets out of the 'normal' range which is from about 75C to 118C - so you will not see any deviation unless there is something seriously wrong. This does not affect the operations of the aux fan unless you get an overtemp condition - so the fact that the fan is running does not mean anything to you for this situation. Cheers Jim Cash.