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911uk

Disconnecting Battery/PCM 3.0 Codes

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHDisconnecting Battery/PCM 3.0 Codes

Leading reported evidence

Install with a pcm (3

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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 have a 2004 C4S fitted with a PCM (3.0 version).

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes
Frequently discussed work

Disconnect !)

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 am told that this siren has it's own power source, (obvious really, if it goes off with the battery disconnected!) and that the way to overcome it is to turn on the ignition with the ignition key, before disconnecting the battery.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes
Read full discussion summary

Leading evidence: 'Install with a pcm (3' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect !)' (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.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Replace battery

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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

Just changed the battery on my 996TT 2004 I have the PCM2 and had no problems.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes

Use car recently i was not give any codes

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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

When I bought this used car recently I was not give any codes.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes

Disconnect !)

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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 am told that this siren has it's own power source, (obvious really, if it goes off with the battery disconnected!) and that the way to overcome it is to turn on the ignition with the ignition key, before disconnecting the battery.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes

Disconnect battery

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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 am told that this siren has it's own power source, (obvious really, if it goes off with the battery disconnected!) and that the way to overcome it is to turn on the ignition with the ignition key, before disconnecting the battery.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes
Frequently discussed actions (6)

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

Disconnect !)

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 am told that this siren has it's own power source, (obvious really, if it goes off with the battery disconnected!) and that the way to overcome it is to turn on the ignition with the ignition key, before disconnecting the battery.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes

Disconnect battery

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 am told that this siren has it's own power source, (obvious really, if it goes off with the battery disconnected!) and that the way to overcome it is to turn on the ignition with the ignition key, before disconnecting the battery.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes

Disconnect battery, will i

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

If for any reason I disconnect the Battery, will I then need to enter codes (Radio and Nav codes) into my PCM?

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes

Install with a pcm (3

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 have a 2004 C4S fitted with a PCM (3.0 version).

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes

Replace 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

Just changed the battery on my 996TT 2004 I have the PCM2 and had no problems.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes

Use car recently i was not give any codes

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

When I bought this used car recently I was not give any codes.

Original post Read captured discussion
Disconnecting Battery/PCM 3.0 Codes
Coverage and how to read this overview

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.

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

  • 911uk: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T025149Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I have a 2004 C4S fitted with a PCM (3.0 version). If for any reason I disconnect the Battery, will I then need to enter codes (Radio and Nav codes) into my PCM? When I bought this used car recently I was not give any codes. Should I have been? I'm confused because I have researched this question on various forums, but see conflicting answers! :x i.e. My unit never needs recoding because it has an internal memory that always retains them! Or, I should have/need both a Code Card PCM and and Code Card Navigation! Which I don't have, and it will cost me a fortune to get them!

POST 2Original post

Battery removal on 996 TT Hi. I had the same worries. Just changed the battery on my 996TT 2004 I have the PCM2 and had no problems. However the moment you remove the old battery the alarm is activated and is extremely loud. Have earplugs in and the new battery ready to replace instantly or you'll blow your eardrums & upset your neighbours.

POST 3 / ORIGINAL POSTEROriginal post

Thanks! Re: The siren going off. I am told that this siren has it's own power source, (obvious really, if it goes off with the battery disconnected!) and that the way to overcome it is to turn on the ignition with the ignition key, before disconnecting the battery. This is supposed to stop it sounding off. I haven't tried it yet, but I will have to overcome it somehow, because I am going to have to leave the battery disconnected for some while, whilst I take my steering wheel and airbag off to get the wheel covered in suede. I can't leave the battery connected and remove the airbag, because if I do the airbag warning light will come on and then it's a trip to my Porsche dealer to get it fixed.

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