Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Help: Intermittent humming/buz car off - draining battery

Recommended Posts

2005 997 Carrera S with 74,000 miles. The other day while working in the garage I noticed a short, very low pitch humming sound coming from the car. It comes every thirty second and lasts about 1-2 seconds and sounds very similar to the noise the lock actuators make. I heard it a few times and thought "weird, I've never heard it before" but I didn't think anything of it. This morning, here in Houston finally we got lower temperatures, I go to start the car and the battery is dead. It had some juice, but not enough to crank. The battery was replaced roughly a year and a half ago and I drive the car about 50 miles daily. I thought it was the change in weather. I had no time to deal with it this morning so I took another car. Half an hour ago I went to recharge the battery and there was no juice left, completely dead. So I had to jump the fuse box to open the hood and jumped started it. I am now recharging it but the humming sound is back. It is not normal. I've had this car for four years and I would have noticed this sound before. Any ideas?? Thank you.

Share this post

Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

I suspect it's the front trunk control module.  It was a pretty common problem on early (i.e. 2005) 997's. My old 997 suffered the humming phenomena and it was correct by replacing the front hood control module. I could be wrong but the humming is a tell-tale sign.

Share this post

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.