Cooling fan on full blast constantly
Thread Starter
Junior Member
Joined: Sep 2015
Posts: 30
Likes: 2
2004 S600L TT
Cooling fan on full blast constantly
Yesterday I was out driving my w212 e63 M175 and i noticed that my oiltemp never got up to working temperature.
When I stopped And got out of the car I heard that my cooling fan was on full blast.
Turned the car off and on again.
Same thing full blast right away and my check engine light turned on.
I checked the codes with my icarsoft and this is the codes I had.
P0343 Camshaft position sensor A Circuit high bank 1 or single sensor
P0368 Camshaft position sensor B circuit high bank 1
P0118 Engine coolant temperature sensor 1 circuit high
P007D Charge air cooler temperature sensor circuit high bank 1
P0138 O2 Sensor circuit high voltage bank 1 sensor 2
P0158 O2 sensor circuit high voltage bank 2 sensor 2
Cleared all the codes and the check engine light was gone.
Drove the last bit home and engine light didnt com back on.
Still cooling fan on max blast and oiltemperature couldnt get over 75 Celsius/ 167 Farenheit.
When I got home and scanned the car again all codes were back.
Anyone who recognize the problem?
Im confused and dont really know where to start with this troubleshooting.
Any feedback would be fantastic!
When I stopped And got out of the car I heard that my cooling fan was on full blast.
Turned the car off and on again.
Same thing full blast right away and my check engine light turned on.
I checked the codes with my icarsoft and this is the codes I had.
P0343 Camshaft position sensor A Circuit high bank 1 or single sensor
P0368 Camshaft position sensor B circuit high bank 1
P0118 Engine coolant temperature sensor 1 circuit high
P007D Charge air cooler temperature sensor circuit high bank 1
P0138 O2 Sensor circuit high voltage bank 1 sensor 2
P0158 O2 sensor circuit high voltage bank 2 sensor 2
Cleared all the codes and the check engine light was gone.
Drove the last bit home and engine light didnt com back on.
Still cooling fan on max blast and oiltemperature couldnt get over 75 Celsius/ 167 Farenheit.
When I got home and scanned the car again all codes were back.
Anyone who recognize the problem?
Im confused and dont really know where to start with this troubleshooting.
Any feedback would be fantastic!
Super Member
Joined: Apr 2018
Posts: 609
Likes: 211
From: Boston area
2016 E63 Wagon
To OP - what is the coolant temp? I doubt it's the actual temp sensor since BOTH temp sensors (P118 and P7D) are reading high temps. But if your coolant temp was high (Liek if your thermostat fails closed) the car is doing the right thing.
Look at the coolant gauge and turn heat to max. Does the gauge drop at all?
If so, you may have a thermostat that is stuck closed. Or some other obstruction in the system.
The number of codes, and not really related except that they are all in the engine harness, makes me wonder if you shouldn;'t check the for the dreaded oil in harness problem?
@PeterUbers Thermostat stuck open should lead to low temp reading? Since you had the same problem and it was resolved, that clearly proves me wrong, but that sounds really weird....
Out Of Control!!
Joined: Jun 2004
Posts: 13,799
Likes: 3,229
2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
I have not had this problem, but with the code for engine temp high should make the fan go full blast.
To OP - what is the coolant temp? I doubt it's the actual temp sensor since BOTH temp sensors (P118 and P7D) are reading high temps. But if your coolant temp was high (Liek if your thermostat fails closed) the car is doing the right thing.
Look at the coolant gauge and turn heat to max. Does the gauge drop at all?
If so, you may have a thermostat that is stuck closed. Or some other obstruction in the system.
The number of codes, and not really related except that they are all in the engine harness, makes me wonder if you shouldn;'t check the for the dreaded oil in harness problem?
@PeterUbers Thermostat stuck open should lead to low temp reading? Since you had the same problem and it was resolved, that clearly proves me wrong, but that sounds really weird....
To OP - what is the coolant temp? I doubt it's the actual temp sensor since BOTH temp sensors (P118 and P7D) are reading high temps. But if your coolant temp was high (Liek if your thermostat fails closed) the car is doing the right thing.
Look at the coolant gauge and turn heat to max. Does the gauge drop at all?
If so, you may have a thermostat that is stuck closed. Or some other obstruction in the system.
The number of codes, and not really related except that they are all in the engine harness, makes me wonder if you shouldn;'t check the for the dreaded oil in harness problem?
@PeterUbers Thermostat stuck open should lead to low temp reading? Since you had the same problem and it was resolved, that clearly proves me wrong, but that sounds really weird....
https://mbworld.org/forums/w212-amg/...-warranty.html
OP check all your camshaft position sensors to see if they've leaked oil in the connector wire harnesses ... pull your ecu and see if there is oil on the pins
https://mbworld.org/forums/w212-amg/...ml#post8628042
Last edited by PeterUbers; Oct 12, 2022 at 08:56 AM.
Thread Starter
Junior Member
Joined: Sep 2015
Posts: 30
Likes: 2
2004 S600L TT
The codes are not for high temperature rather high voltage/open circuit.
Water temp in the car was fine not to high anyways.
I know if the cooling fan dont get any signal or a signal that not make sense it automatically goes on full blast.
What worries me the most is all the codes I get at the same time and like you said dont seem to be related.
Thanks for the tip on oil in harness.
Have to check this out!
Thanks for your input guys!
Water temp in the car was fine not to high anyways.
I know if the cooling fan dont get any signal or a signal that not make sense it automatically goes on full blast.
What worries me the most is all the codes I get at the same time and like you said dont seem to be related.
Thanks for the tip on oil in harness.
Have to check this out!
Thanks for your input guys!
Thread Starter
Junior Member
Joined: Sep 2015
Posts: 30
Likes: 2
2004 S600L TT
i agree I didn't have all those codes ... yikes I hope he doesn't have what I've coined "amg cancer" ... oil in the harnessed ..
https://mbworld.org/forums/w212-amg/...-warranty.html
OP check all your camshaft position sensors to see if they've leaked oil in the connector wire harnesses ... pull your ecu and see if there is oil on the pins
https://mbworld.org/forums/w212-amg/...ml#post8628042
https://mbworld.org/forums/w212-amg/...-warranty.html
OP check all your camshaft position sensors to see if they've leaked oil in the connector wire harnesses ... pull your ecu and see if there is oil on the pins
https://mbworld.org/forums/w212-amg/...ml#post8628042
Had a similar problem with my w220 s600 back in the day.
It had filled my TCU with oil!
Thanks for the tip!
Super Member
Joined: Apr 2018
Posts: 609
Likes: 211
From: Boston area
2016 E63 Wagon
The codes are not for high temperature rather high voltage/open circuit.
Water temp in the car was fine not to high anyways.
I know if the cooling fan dont get any signal or a signal that not make sense it automatically goes on full blast.
What worries me the most is all the codes I get at the same time and like you said dont seem to be related.
Thanks for the tip on oil in harness.
Have to check this out!
Thanks for your input guys!
Water temp in the car was fine not to high anyways.
I know if the cooling fan dont get any signal or a signal that not make sense it automatically goes on full blast.
What worries me the most is all the codes I get at the same time and like you said dont seem to be related.
Thanks for the tip on oil in harness.
Have to check this out!
Thanks for your input guys!
I thought all codes that showed an open circuit had the "voltage" modifier, with the temp sensor ones do not have. Just curios - if both water temp sensors are high (so open), how do you know the temperature was OK?
The oil will take a while to warm up and I believe that since we have 8.5 liters of oil, it is the primary heat extractor from the engine. But I agree the oil temp should go up above 75 degrees if you drive for a while.
But the other point stands - if you have six sensors go offline at once, I believe you have an electrical problem. Also check ground connections.
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Thread Starter
Junior Member
Joined: Sep 2015
Posts: 30
Likes: 2
2004 S600L TT
Sorry - misread.
I thought all codes that showed an open circuit had the "voltage" modifier, with the temp sensor ones do not have. Just curios - if both water temp sensors are high (so open), how do you know the temperature was OK?
The oil will take a while to warm up and I believe that since we have 8.5 liters of oil, it is the primary heat extractor from the engine. But I agree the oil temp should go up above 75 degrees if you drive for a while.
But the other point stands - if you have six sensors go offline at once, I believe you have an electrical problem. Also check ground connections.
I thought all codes that showed an open circuit had the "voltage" modifier, with the temp sensor ones do not have. Just curios - if both water temp sensors are high (so open), how do you know the temperature was OK?
The oil will take a while to warm up and I believe that since we have 8.5 liters of oil, it is the primary heat extractor from the engine. But I agree the oil temp should go up above 75 degrees if you drive for a while.
But the other point stands - if you have six sensors go offline at once, I believe you have an electrical problem. Also check ground connections.
But I believe there are 2 sensors for the engine cooling system.
One for the cooling management and one for the dashboard reading?
Correct me if im wrong.
The P007D code is refering to air temperature of the compressed air after the turbo
I have to believe I have some electrical problem.
Checking ground connections seems like another good tip.
I will update u guys when I have time to look at the car.
For now Im quite sick of it :-P
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