Notices
996 Forum 1999-2005
Sponsored by:

Porsche 996 ECU replacement

Thread Tools
 
Search this Thread
 
Old Feb 7, 2023 | 11:36 AM
  #1  
Vishwaka's Avatar
Vishwaka
Thread Starter
1st Gear
 
Joined: Feb 2023
Posts: 1
Likes: 0
Default Porsche 996 ECU replacement

Hi all,

Could use your input on a matter.

My 1999 996 was missing, and the idle was hunting. When the agents looked at it, they found that the ECU voltage is low, and couldn't be fixed. I now have to change my ECU.

Does anyone know where I could buy a 996 ECU? Also, would a pre-owned ECU be ok to plug in, or would it have to be reconfigured?

Thanks in advance!
Vishwaka
Reply
Old Feb 8, 2023 | 01:47 PM
  #2  
JFP in PA's Avatar
JFP in PA
Advanced
 
Joined: Apr 2008
Posts: 63
Likes: 20
Default

Swapping DME's without recoding will simply not work.
Reply
Old Feb 8, 2023 | 02:36 PM
  #3  
allcool's Avatar
allcool
Burning Brakes
 
Joined: Jul 2022
Posts: 1,246
Likes: 840
From: Parkland FL
Default

Originally Posted by Vishwaka
Hi all,

Could use your input on a matter.

My 1999 996 was missing, and the idle was hunting. When the agents looked at it, they found that the ECU voltage is low, and couldn't be fixed. I now have to change my ECU.

Does anyone know where I could buy a 996 ECU? Also, would a pre-owned ECU be ok to plug in, or would it have to be reconfigured?

Thanks in advance!
Vishwaka
I'd get a trusted professional second opinion diagnostic for sure and try and avoid changing out the original. Its a specialized coding job to get it right. As ecu(DME) & immobilizer unit under the driver seat, & all keys,,, all need to be coded to match each other perfectly or no start/no run.

There was just a good thread on the same subject, you should read it....

If ecu is positively needed, ECUDoctors is the place to go, they can fix your original more than likely, and if needed can code the complete set. They're good guys.

jmo
Reply
Old Feb 8, 2023 | 02:41 PM
  #4  
Porschetech3's Avatar
Porschetech3
Rennlist Member
15 Year Member
 
Joined: Oct 2010
Posts: 7,724
Likes: 7,003
From: Alabama USA
Default

Are you talking about the 5 volt reference volage the DME sends out to Sensors is much lower than 5v ? If so, that is very unusual and like Jeff and others have said, any other DME has to be programmed using PIWIS with IPAS codes that only authorized persons have accesss to..
Reply
Old Feb 8, 2023 | 04:05 PM
  #5  
dgmark's Avatar
dgmark
Rennlist Member
10 Year Member
 
Joined: Jun 2011
Posts: 682
Likes: 98
From: Downers Grove, ILL
Default

Good used ecus can be had for a couple of hundred, Ecu doctors can code the immobilizer If you send them the keys and security module. They can also bypass the security altogether if you want.

Last edited by dgmark; Feb 8, 2023 at 04:06 PM.
Reply
Old Feb 10, 2023 | 05:46 PM
  #6  
pretarch's Avatar
pretarch
Track Day
 
Joined: Apr 2022
Posts: 16
Likes: 0
Default

Thanks @dgmark and @allcool

@Vishwaka Getting used ECUs for a 996 is not like in the older cars where you could get used unit and test things out.

Programming is necessary.

See these 2 videos that explain it in detail:
and
Reply




All times are GMT -3. The time now is 06:53 PM.

story-0
10 Best Non-Flat Six Porsches You Can Buy For Under $100K

Slideshow: If you have $100K to spend on a Porsche but want something a little different, these are the 10 best non-flat six Porsches you can buy.

By Joe Kucinski | 2026-05-28 15:36:11


VIEW MORE
story-1
Porsche's Top 5 Most Questionable Naming Decisions

Slideshow: For a company obsessed with engineering precision, Porsche has occasionally named its cars in ways that left even loyal enthusiasts scratching their heads.

By Verdad Gallardo | 2026-05-27 18:43:48


VIEW MORE
story-2
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field

Slideshow: Pogea Racing's latest Porsche 964 project blends carbon-fiber construction, modern chassis upgrades, and up to 500 horsepower while keeping the air-cooled 911 experience firmly analog.

By Verdad Gallardo | 2026-05-23 10:34:27


VIEW MORE
story-3
6 Convertible Top MYTHS Most People Don't Understand!

Slideshow: dispelling common convertible top myths

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-4
2026 Porsche 911 Club Coupe is Spectacular, And Everything Wrong with the Porsche Market

Slideshow: The 2026 Porsche 911 Club Coupe is being resold $150K above sticker and that is a real problem.

By Joe Kucinski | 2026-05-21 11:52:54


VIEW MORE
story-5
Talos Takes Your 991 Porsche 911 GT3 to the Next Level for a Cool $1.13 Million

Slideshow: Talos Vehicles has transformed the Porsche 911 GT3 RS into a carbon-bodied, race-inspired machine that costs well over $1 million before the donor car is even included.

By Verdad Gallardo | 2026-05-19 13:39:04


VIEW MORE
story-6
9 Vehicles Porsche Helped Engineer that Aren't Porsches

Slideshow: Long before engineering consulting became trendy, Porsche was quietly helping other automakers build everything from supercars to economy hatchbacks.

By Verdad Gallardo | 2026-05-15 12:44:44


VIEW MORE
story-7
9 Features and Characteristics That Only Porsche People Understand

Slideshow: Some brands build cars. Porsche builds traditions, obsessions, and a few habits that stopped making sense decades ago but somehow became part of the charm.

By Verdad Gallardo | 2026-05-13 18:46:13


VIEW MORE
story-8
I've Written 500 Rennlist Articles: Here's How Porsche Has Changed Along the Way

Slideshow: Six years and 500 Rennlist articles later, these are the biggest changes at Porsche.

By Joe Kucinski | 2026-05-11 09:52:55


VIEW MORE
story-9
10 Most Unnecessary Porsches Ever Built (And Why We Love Them)

Slideshow: Some Porsches exist for very specific reasons-others feel like they were built just to see if anyone would notice.

By Verdad Gallardo | 2026-05-06 18:00:32


VIEW MORE