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?

Aug 19, 2010 Hi there, Just plugged a GT1 into my '01 X5 with 42k on it and noticed the following code from the DME: 140 Activation map cooling Is it normal for the thermostat. Mar 06, 2013 140 Output Thermostat Map cooling error in INPA. Activation, map cooling. Sponsored Links #2. The thermostat has a heating element in it.

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. 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.

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. 528i 5sp 06/00 98k My code is P1622 (BMW 123), read on both OBDII and Peake. Bentley description, “Map Cooling Thermostat Control Circuit Electrical”. Peake description, “Electrical thermostat control final stage”.

The thermostat is 1 year old w/ ~15k miles. Ics Software Astrology Full. The car temperature gauge stays at dead 12 o’clock throughout various driving conditions. Dolby Gui Software Gigabyte. If I reset the codes, this code will reappear immediately after starting/driving the car.

I was recently at the dealership and spoke with the service top tech. He said the problem is the electrical wires at the t-stat get too hot and burn up. He said the solution is to cut out the deteriorating portion of the wires at the electrical connector. He didn’t provide more detail. I recently pulled off the t-stat electrical connector and sprayed electrical contact cleaner on both t-stat and cable connector contact points.

The electrical cable connector female contacts looked quite discolored. I tried scrapping them with an exacta knife, but it didn’t seem to make a difference. I reconnected, cleared the codes, started the car, and got the code again. My state inspection expires at the end of this month.

I was addressing pre-cat O2 sensor codes, which were causing a service engine light. One of the sensors failed at ~15k miles! I replaced it with an old sensor and sent of the failed one to Bosch for a warranty claim. The O2 codes and the SEL are now gone and I’m left with the t-stat code.

I thought I’d pass inspection without a SEL light, but I’ve just learned I’ll fail inspection if any codes are present. Thus I‘ll need to address the t-stat problem before the month is out. I’ll take a look at it, but I might just let the dealership handle it this time. I don’t want to cut up my electrical harness and end up needing to replace a large system of cables. The t-stat cable emanates from an electrical distribution box (adjacent to throttle) that has a large number of electrical cables connecting through it. Rajaie 528i 5sp 06/00.

You are probably already aware of the following, but I always have to find out about these things the hard way. I had this silly notion that I had drained the necessary coolant out after disconnecting the hose to the thermostat. About 2x as much coolant was behind the thermostat when I unbolted it. Fortunately I had already removed the drip tray and got a blue driveway out of the deal. Remember The Titans Soundtrack Zip more. Anyway, the thermostat is cheap enough that it doesn't seem worth it to cut into the wiring harness.

I just hope you don't get to do the same repair again. I have had this problem for some time too. I replaced the thermostate and 6 months later I started getting the Peake code '8C'. Note that I did NOT get a check engine light, just the code kept coming up.