Pelican Parts

991.1 Overvoltage - 15.3v

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCH991.1 Overvoltage - 15.3v

Leading reported evidence

Check battery

Performed · outcome unconfirmed

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Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed · Original poster
I checked the battery with a multimeter after car had cooled down some – it was 12.45 at rest cranked it up and it went to 13.4 immediately and quickly rose to 14.7v within 2 minutes.
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991.1 Overvoltage - 15.3v

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Leading evidence: 'Check battery' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check 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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Run alternator at 1.5-2 v higher than normal

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Suggestion
Both of those modes can run the alternator at 1.5-2 V higher than normal.
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991.1 Overvoltage - 15.3v

Use sport mode

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Suggestion · Original poster
I understand that it really should not go past ~14.7v in normal mode – [I don’t use sport mode that often].
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991.1 Overvoltage - 15.3v

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check battery

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 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.

Performed · outcome unconfirmed · Original poster
I checked the battery with a multimeter after car had cooled down some – it was 12.45 at rest cranked it up and it went to 13.4 immediately and quickly rose to 14.7v within 2 minutes.
Original post Read captured discussion
991.1 Overvoltage - 15.3v

Run alternator at 1.5-2 v higher than normal

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
Both of those modes can run the alternator at 1.5-2 V higher than normal.
Original post Read captured discussion
991.1 Overvoltage - 15.3v

Use sport mode

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 · Original poster
I understand that it really should not go past ~14.7v in normal mode – [I don’t use sport mode that often].
Original post Read captured discussion
991.1 Overvoltage - 15.3v

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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

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

Pelican Parts: 1 discussions

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Generation: 20261026T181445Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

2012 Porsche 991.1 / ~68,500 miles/ Over-voltage issue – 15.3v at 2500rpm Had a disturbing drive this morning – driving out to a Porsche shop in Ashburn to discuss some issues on my 1980 911SC – I noticed that the voltage gauge was climbing – past 13.5v…. past 14v.. up to 15.3v. NOT GOOD. After discussions I drove back home – voltage stayed in the 15v range and I parked it. Started to troubleshoot the issue. Pulled up Pelican – then Rennlist – and all I could find are issues of undervoltage – nothing about overvoltage. As noted car has ~68k on the clock and still has the original battery as far as I know = 8 years old. I am third owner – got it in Mar 2019. Car starts just fine – but after a brief period – maybe couple of minutes voltage climbs from the 13v range – to 14v to 15v. I understand that it really should not go past ~14.7v in normal mode – [I don’t use sport mode that often]. I checked the battery with a multimeter after car had cooled down some – it was 12.45 at rest cranked it up and it went to 13.4 immediately and quickly rose to 14.7v within 2 minutes. Battery is Duralast Platinum. No external signs of swelling or battery acid overflow. ?? Question: Is the voltage regulator for the 991.1 similar to that of the 996? 997? – where the voltage regulator is a separate sub-component? Or is it more integrated into the alternator? I have no warning lights – just the reading of the voltage on the instruments. What do you think? kgl

POST 2Original post

If you have the car in the chrono sport or sport plus mode, take to out and see if the voltage drops. Both of those modes can run the alternator at 1.5-2 V higher than normal.

POST 3Original post

Ive seen 15V on mine since new... think its normal ...

POST 4Original post

I think you are OK. 14.7 with the engine running is normal and plus or minus a few tenths of a volt shouldn't be anything to worry about.

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