prblue
Well-known member
I'm posting it here rather than car specific sub-forum, because those haldex units are used in lots of cars so hopefully it will get more exposure here.
My car is Golf mk5 4motion 2.0tdi 16v.
I've been having intermittent issue pop up usually from few minutes from starting the car to even half an hour (prior to it happening it is all fine). When it happens the yellow traction control icon gets lit on the dash and AWD gets disengaged.
Scanning with Vcds gave me:
"AWD Haldex Clutch Pump Deffective" code. Clearing the code and rescanning brings it up almost every time.
Now, I know the pump works, when it doesn't report an issue because I'm driving in very snowy conditions and I can't get up my driveway without rear wheel drive. When AWD is off and I really need it, I can usually just switch the car off and on and then it will work for a bit.
Can anyone give me any tips on this one? Should I be focusing on wiring between the AWD control module and the pump? Or should I be pulling the pump out and checking it's filter? Perhaps a haldex oil change is a good idea? (the car has 189k km on the clock and likely original haldex oil).
Are there some additional checks I can do with vcds to find out why the control module thinks the pump is defective? Does it measure pump motor current? Oil pressure? Some other sensor? I don't think it is possible to detect if the haldex clutch engages just by measuring rear wheel rotation so it must be doing one of the above.
Ill be grateful for any tips anyone can give me before I get into it so to speak.
My car is Golf mk5 4motion 2.0tdi 16v.
I've been having intermittent issue pop up usually from few minutes from starting the car to even half an hour (prior to it happening it is all fine). When it happens the yellow traction control icon gets lit on the dash and AWD gets disengaged.
Scanning with Vcds gave me:
"AWD Haldex Clutch Pump Deffective" code. Clearing the code and rescanning brings it up almost every time.
Now, I know the pump works, when it doesn't report an issue because I'm driving in very snowy conditions and I can't get up my driveway without rear wheel drive. When AWD is off and I really need it, I can usually just switch the car off and on and then it will work for a bit.
Can anyone give me any tips on this one? Should I be focusing on wiring between the AWD control module and the pump? Or should I be pulling the pump out and checking it's filter? Perhaps a haldex oil change is a good idea? (the car has 189k km on the clock and likely original haldex oil).
Are there some additional checks I can do with vcds to find out why the control module thinks the pump is defective? Does it measure pump motor current? Oil pressure? Some other sensor? I don't think it is possible to detect if the haldex clutch engages just by measuring rear wheel rotation so it must be doing one of the above.
Ill be grateful for any tips anyone can give me before I get into it so to speak.