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Thread: P0046 turbo actuator fault

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  1. P0046 turbo actuator fault 
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    Hello chaps. This is my first ever post and I need some help with my 2005 Audi a6 3.0tdi Quattro.

    It's has an intermittent engine management fault. The code is p0046 which is a turbo boost control solenoid A circuit fault. The car has no performance issues commonly found with a turbo actuator issues, it runs and performs perfectly fine under all loads and conditions regardless of the engine light. I've disconnected the turbo actuator and checked the turbo vaines are free. The actuator also seems to function. I'm thinking it could be the boost pressure sensor sending spurious readings but i would like to know if anyone has experienced this and can advise before I take the front end apart to reach the sensor.

    Thanks very much in advance

    Warren

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  2. Re: P0046 turbo actuator fault 
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    I have a similar issue on my A5 3.0 tdi. Have a replacement actuator solenoid in the post after trying various other things
     
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  3. Re: P0046 turbo actuator fault 
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    Quote Originally Posted by olnmfc View Post
    I have a similar issue on my A5 3.0 tdi. Have a replacement actuator solenoid in the post after trying various other things
    Great. Let me know how that goes ... thanks for your reply

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  4. Re: P0046 turbo actuator fault 
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    Turned out my issue was the small electric motor inside the actuator solenoid. I stripped the solenoid and liberally sprayed the motor with WD40. Lots of gunk inside the electric motor. Reassembled and all lights out no error code, sorted... for no cost. A garage would have fitted a new turbo with solenoid probably at circa 1500 which would have cured the problem and Id have been none the wiser.... I've come across this problem with Audis before. Central locking and electric window motors. They just need cleaned and then all is well. Saves lots of cash
    Last edited by olnmfc; 18-02-2018 at 01:26 AM.
     
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  5. Re: P0046 turbo actuator fault 
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    Quote Originally Posted by olnmfc View Post
    Turned out my issue was the small electric motor inside the actuator solenoid. I stripped the solenoid and liberally sprayed the motor with WD40. Lots of gunk inside the electric motor. Reassembled and all lights out no error code, sorted... for no cost. A garage would have fitted a new turbo with solenoid probably at circa 1500 which would have cured the problem and Id8 have been none the wiser.... I've come across this problem with Audis before. Central locking and electruc window motors. They just need cleaned and then all is well. Saves lots of cash
    Did you have any symptoms on your car or was it just the engine light and the code ?

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  6. Re: P0046 turbo actuator fault 
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    The performance was absolutely fine. On start up with the MIL reset the actuator would function normally and the engine would sound normal. But as soon as you got into 2nd or 3rd gear the MIL would come on and the exhaust note would become noticeably more hollow, as if you had just acquired a boy racer exhaust. This of course was because the actuator position was defaulting to a certain open position. With MIL on turbo could be a bit laggy sometimes, depended upon how you fed power in. I had also tried the Mr Muscle beforehand. This didn't cure anything but may have been of benefit anyway. My A5 has done 200k. Still blistering performance (had de Cat also)
     
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  7. Re: P0046 turbo actuator fault 
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    Quote Originally Posted by olnmfc View Post
    The performance was absolutely fine. On start up with the MIL reset the actuator would function normally and the engine would sound normal. But as soon as you got into 2nd or 3rd gear the MIL would come on and the exhaust note would become noticeably more hollow, as if you had just acquired a boy racer exhaust. This of course was because the actuator position was defaulting to a certain open position. With MIL on turbo could be a bit laggy sometimes, depended upon how you fed power in. I had also tried the Mr Muscle beforehand. This didn't cure anything but may have been of benefit anyway. My A5 has done 200k. Still blistering performance (had de Cat also)
    Mate ... you are an absolute legend... I was all lined up for a new actuator and turbo and after opening the actuator and cleaning with brake cleaner and lubricating it worked a charm... the fault cleared after a reset and has not returned ... i would buy you some beers big-time.... you saved me a fortune by replying... thank you!!!

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  8. Re: P0046 turbo actuator fault 
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    Quote Originally Posted by WarrenA6 View Post
    Mate ... you are an absolute legend... I was all lined up for a new actuator and turbo and after opening the actuator and cleaning with brake cleaner and lubricating it worked a charm... the fault cleared after a reset and has not returned ... i would buy you some beers big-time.... you saved me a fortune by replying... thank you!!!

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    For anyone with this issue... clean and lube this

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  9. Re: P0046 turbo actuator fault 
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    Excellent news. Hope a long term fix but if issue returns then you know where to look - the solenoid. Those cleaned central locking /window motors on my old A4 Quattro where still fine after a year
     
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