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Does disconnecting the battery reset the ECU?

Dus10R

By Dus10R
in 996 TT, 996 TT S, 996 GT2

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Dus10R Member

Dus10R

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I'd like to reset the ECU so that the car will start learn it's new atmosphere/elevation, etc more quickly. Does disconnecting the battery do this? Also, does disconnecting the battery do anything funny to the car? I know you have to reset the windows but about the remotes for the locks and settings?

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catmanluge Member

catmanluge

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I'd like to reset the ECU so that the car will start learn it's new atmosphere/elevation, etc more quickly. Does disconnecting the battery do this? Also, does disconnecting the battery do anything funny to the car? I know you have to reset the windows but about the remotes for the locks and settings?

Radio Code

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Loren Member

Loren

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Yes, if you disconnect the battery for 5 minutes or more the DME will go back to it's basic program. It will then re-learn to your driving style. You won't see a huge difference but you will see some.

The control unit for the Tiptronic does the same - so I guess Tiptronic drivers might see the most change.

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Dus10R Member

Dus10R

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Yes, if you disconnect the battery for 5 minutes or more the DME will go back to it's basic program. It will then re-learn to your driving style. You won't see a huge difference but you will see some.

The control unit for the Tiptronic does the same - so I guess Tiptronic drivers might see the most change.

What are "radio codes" that were referred to above?

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Loren Member

Loren

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On older cars (pre MY2003 MOST cars) there was a radio security code that was required to use the radio. This was intended (I think) as a deterrent to keep people from stealing the car radio.

CDR-23 is a MOST radio and has its code stored in the DME so if the power fails you do not lose the code. If the radio in a MOPT system car is changed (to another Porsche CDR-23) then the new radip's code need to be entered into the DME (with a PIWIS or PST2 tester).

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Jon996 Member

Jon996

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On older cars (pre MY2003 MOST cars) there was a radio security code that was required to use the radio. This was intended (I think) as a deterrent to keep people from stealing the car radio.

CDR-23 is a MOST radio and has its code stored in the DME so if the power fails you do not lose the code. If the radio in a MOPT system car is changed (to another Porsche CDR-23) then the new radip's code need to be entered into the DME (with a PIWIS or PST2 tester).

Just a quick question--I have heard that using the cigarette lighter trickle charger while you change batteries will preserve the radio and ECU codes. Does this work? Thanks

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1schoir Member

1schoir

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On older cars (pre MY2003 MOST cars) there was a radio security code that was required to use the radio. This was intended (I think) as a deterrent to keep people from stealing the car radio.

CDR-23 is a MOST radio and has its code stored in the DME so if the power fails you do not lose the code. If the radio in a MOPT system car is changed (to another Porsche CDR-23) then the new radip's code need to be entered into the DME (with a PIWIS or PST2 tester).

Just a quick question--I have heard that using the cigarette lighter trickle charger while you change batteries will preserve the radio and ECU codes. Does this work? Thanks

That does work, as long as the power is not interrupted. Remember, if you have one of the "early" cigarette lighters, the receptacle is a little wider in diameter and a lot shorter, so it's easy for the plug to fall out and thus to "lose power" accidentally.

Regards, Maurice.

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Jon996 Member

Jon996

Posted
Posted
On older cars (pre MY2003 MOST cars) there was a radio security code that was required to use the radio. This was intended (I think) as a deterrent to keep people from stealing the car radio.

CDR-23 is a MOST radio and has its code stored in the DME so if the power fails you do not lose the code. If the radio in a MOPT system car is changed (to another Porsche CDR-23) then the new radip's code need to be entered into the DME (with a PIWIS or PST2 tester).

Just a quick question--I have heard that using the cigarette lighter trickle charger while you change batteries will preserve the radio and ECU codes. Does this work? Thanks

That does work, as long as the power is not interrupted. Remember, if you have one of the "early" cigarette lighters, the receptacle is a little wider in diameter and a lot shorter, so it's easy for the plug to fall out and thus to "lose power" accidentally.

Regards, Maurice.

Thanks!!

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  • 4 years later...
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Loren Member

Loren

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due to dead battery the radio with/nav is asking for code? Does anyone have the code for 996 2001 turbo? Or, how can I get the code without going to the dealer?

Thanks.

From the Lost Radio Code FAQ

"Can you give me a code for my PCM?

These units are manufactured jointly by Siemens and Becker, and the only place where you can get the codes required is from the dealer/OPC. The PCM’s require two codes, the ICS/Siemens code and a Becker code. The ICS is the first code requested.

Sorry, the only place you can get a PCM code is from a dealer/OPC."

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