Thread: Transmission fault/HDC fault

If you are lucky, you have a defective tail light bulb, (note defective, not burned out), or perhaps a defective brake light switch.

The link below is one of many related to the kind of problems that the brake light switch can cause. You can use the search function and put in "+brake +switch" as a search term, (leave out the "".

Generally the more conflicting error messages you get, the better. There is no message for defective bulbs or brake light switches, hence ..... You may also be getting Cruise Control not operative as well as the HDC not available etc.

http://www.aulro.com/afvb/d3-d4-rrs/...indicator.html

Thanks very much, very helpful and appreciated.

The other main culprit for this message is a dying battery. It'll still start the car but the voltage is isn't great, so it chucks up these faults. New battery and all is well again.

Have checked the battery, all good. We recently had a hayman reese brake controller fitted to the vehicle, they had dramas with it as well. Took the auto sparkies most of a day to complete the job after they stated it would take 1.5 hours max. I wonder whether this is interfereing with the brake sensor.

Originally Posted by jacknnick

I have these faults showing on our D3, anyone had the same? What was the outcome? Expensive fix? Have turned the vehicle off and the faults comes back, have disconnected and cleaned battery terminals but faults come back. Any help appreciated.

Hi Jack, my D3 brake lights used to bite me too often with similar faults to you. New brake light switch, LED globes and disconnecting my trailer brake controler no problems. I would get the battery and alternator checked as well. Search posts on any of these topics would give you a gold mine of data to look at.

Hi Jack I had similar situation. Ended up having a wheel alignbment done and problem has not returned...yet!

+1 for battery/alternator but the bulb issue can be the culprit for sure... good luck.

Had exactly the same problems on my D3. Transmission fault, couldn't use command shift, and HDC fault. I replaced the brake switch and have had no problems since.

HTH

Ivan