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Thanks for the link to your post. I've read it and it sounds like a nightmare. I'm going to replace my FAN1 motor and module and additional parts as recommended by John. If that fails to fix the fault then I will dig deeper. Fingers crossed.
Hi, have you replaced your fan? Is the problem fixed? I just got the same issue as yours right now
No I have not replaced it for the moment. Saving up to change a couple of things all at the same time I have the front off the car. I have removed the 50amp fuse as recommended instead of having to disconnect the battery. Cat temp is fine no problems at the moment in the winter.
I did notice that if buying new the Phaeton fan and module is no cheaper than the Bentley part unfortunately. Second hand on ebay they are cheaper than the Bentley part.
No I have not replaced it for the moment. Saving up to change a couple of things all at the same time I have the front off the car. I have removed the 50amp fuse as recommended instead of having to disconnect the battery. Cat temp is fine no problems at the moment in the winter.
I did notice that if buying new the Phaeton fan and module is no cheaper than the Bentley part unfortunately. Second hand on ebay they are cheaper than the Bentley part.
My fan #2 runs at max speed after the engine is off, and only disconnect the battery or fuse can turn it off. However, today I left it running and after exact 10 mins, the fan is turned off by itself.
Interesting. When does the FAN #2 come on? My FAN come on after 15 seconds of the engine being started and displayed an Engine Management light on the dashboard.
Interesting. When does the FAN #2 come on? My FAN come on after 15 seconds of the engine being started and displayed an Engine Management light on the dashboard.
Same as yours, Fan #2 kicks off about 10-15 seconds and run at full speed after engine starts and the engine light is now always on. Even if I clear the fault code, it will come back right away.
I think it's FAN module rather than ECU. Yours is FAN #2 and mine is FAN #1. I don't think fa faulty ECU would cause this and there would probably be other issues with the car if it was the ECU.
I think it's FAN module rather than ECU. Yours is FAN #2 and mine is FAN #1. I don't think fa faulty ECU would cause this and there would probably be other issues with the car if it was the ECU.
I finally fixed my issue. It was much simple than I thought. The signal wire color yellow brown from the ECU to Fan 2 was broken somewhere and it caused error "Fan 2 control module: no signal/communication". And Fan #2 runs at full speed 5 seconds after ignition is on.
I think you should swap Fan 1 to Fan 2, and check your signal wire to Fan 1. You can check out info on my topics to see the testing procedure I did to figure out the issue.
I finally fixed my issue. It was much simple than I thought. The signal wire color yellow brown from the ECU to Fan 2 was broken somewhere and it caused error "Fan 2 control module: no signal/communication". And Fan #2 runs at full speed 5 seconds after ignition is on.
I think you should swap Fan 1 to Fan 2, and check your signal wire to Fan 1. You can check out info on my topics to see the testing procedure I did to figure out the issue.
How did you swap the fans over? What it at the plugs at the bottom of the radiator? Do you have a link to the testing process you under took? Many thanks James.
How did you swap the fans over? What it at the plugs at the bottom of the radiator? Do you have a link to the testing process you under took? Many thanks James.
I don't have a link because I took my car to VW dealer and the technican did all the checks for me.
I posted the procedures on my topics:
Under the bottom of front bumper, after take of the cover, you will see plugs for two fans. The wires are length enough so you can swap these plugs, and by doing so, you can test to determine whether or not Fan 1 has problem.
For your case, Fan 1 runs nonstop, after the swapping, if Fan 1 runs just fine and Fan 2 starts to run nonstop, then both of your fans should be ok. Now you should check the signal wire color yellow brown from the ECU to the fan 1.
If after swapping, fan 1 still runs nonstop, then you might have to replace a new fan. I manage to find this fan is the same as one in VW Phaeton which is sold separately as Fan 1 and Fan 2, the price is ~ £700 from UK seller.
Last edited by TungNguyen; Feb 20, 2020 at 05:46 AM.
Hi, I'm wondering if anyone can advise me on my current issue with FAN1 on my Conti GT. Car has had not issues for year now, then started the car the other day and after 5-7 seconds the radiator fan came on along with the engine management light. Engine was cold. Turned car off but the fan remained on all the time. The only way to stop the fan was to disconnect the battery for a couple of seconds. I'm driving the car but have to disconnect the battery once I arrive somewhere to shut the fan off.
On a basic OBD reader it reports P0691 Fan 1 Control Circuit Low. I have checked all the fuses but can't find the root cause. I have been looking for a radiator fan replay thinking it might be that but can't find one.
So my question is, is there a fan relay in a Conti GT or is the fans operation controlled from the management module on the fan housing? If there is no reply is the most likely cause of the problem the fan module and the solution to replace the fan and controller?
Appreciate any help anyone can offer.
Hello did you figure out the issue..my car is doing the same exact thing and throwing the same code. please help
Yes I did solve the issue. It turned out to be nothing to do with the fans. Water ingress via the fuse box in the engine bay in front of the passenger seat. (right hand drive car).
I dried out the fuse box with a hair dryer and covered the fuse box with plastic and then placed the lid and gaffer taped the bulk head join between the bulk head and the fuse box lid.
You have to wait for the water to dry out. During this wait period I disconnected the fan module from under the front radiator, this for me was easier than disconnecting the fuse or the battery every time to stop the fan. No problems driving the car without the fan connected. I ended up waiting about 2 months for the loom to dry.
While investigating the issue I did buy a second hand fan unit from a Phaeton. Control unit and fan head without the bladed fan. See very small picture.
What was interesting when i reconnected the FAN this week on Tuesday I cleared the fault using ODB11 and the fan started up by itself again. When i connected the new second hand fan module and then cleared the fault and then connected back the original fan the issue was solved and the engine management light was off. Using the new second hand fan seemed to help clear something. I have not had long to test as only did it this week, but that is what i did to solve the issue. Let me know if you have any more questions.
Yes I did solve the issue. It turned out to be nothing to do with the fans. Water ingress via the fuse box in the engine bay in front of the passenger seat. (right hand drive car).
Exactly the same problem for me. I discovered the cause when i was washing the car one day. When hosing down the fans started up. The same thing happened the next time i washed the car (no rain in between) so figured it wasn't a coincidence. Ended up deep cleaning the scuttle with a vacuum and flexible hosepipe to get under the fax blower box so water could drain away, which is now on my routine service list to do.
