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Will ECU remember fault codes with no power? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHWill ECU remember fault codes with no power? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Disconnect battery

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Suggestion
But I hope overrevs would be stored on an EEPROM, otherwise anybody can clear them just by disconnecting the battery.
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Will ECU remember fault codes with no power? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Leading evidence: 'Disconnect battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect battery' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Reconnect systems

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Suggestion
Not likely and any codes could be spurious due to reconnecting systems.
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Will ECU remember fault codes with no power? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed actions (2)

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Disconnect battery

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion
But I hope overrevs would be stored on an EEPROM, otherwise anybody can clear them just by disconnecting the battery.
Original post Read captured discussion
Will ECU remember fault codes with no power? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Reconnect systems

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
Not likely and any codes could be spurious due to reconnecting systems.
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Will ECU remember fault codes with no power? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

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Generation: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Regarding a 2000 986S (Motronic 7.2) that has been apart for +3 years, I'm curious if the ECU will still have the fault codes and other stored info that a Durametric will be able to read? This is with no power for this amount of time and with the ECU disconnected. Especially want to know overrevs and cam deviation but I think cam deviation is only readable in real time or does the ECU save anything pertaining to this? Any other info that would be worth looking for? Of course, all of this is only valid if the ECU remembers information this long without a power source? Thanks.

POST 2Original post

Not likely and any codes could be spurious due to reconnecting systems.

POST 3Original post

Codes, no cam deviation probably not. But I hope overrevs would be stored on an EEPROM, otherwise anybody can clear them just by disconnecting the battery.

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