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PCM radio malfunction due to voltage

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHPCM radio malfunction due to voltage

Leading reported evidence

Check over by a competent radio or electronics repairer

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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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
Take it out and have it checked over by a competent radio or electronics repairer.
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PCM radio malfunction due to voltage

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Leading evidence: 'Check over by a competent radio or electronics repairer' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check over by a competent radio or electronics repairer' (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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1 matching discussions · 2 captured posts examined · 0 partial discussions

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Replace voltage regulator (with warm engine voltage started

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
Few months ago I had to replace the voltage regulator (with warm engine voltage started to go below 12 on dashboard gauge); now it's ok, around 13.5 volts; after this the situation with radio became worse, so I understood it's voltage dependant: if voltage it's too high, radio shuts down; sometimes it doesn't work but if I switch on everything (high beams, etc) it starts.
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PCM radio malfunction due to voltage

Frequently discussed actions (2)

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

Check over by a competent radio or electronics repairer

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
Take it out and have it checked over by a competent radio or electronics repairer.
Original post Read captured discussion
PCM radio malfunction due to voltage

Replace voltage regulator (with warm engine voltage started

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
Few months ago I had to replace the voltage regulator (with warm engine voltage started to go below 12 on dashboard gauge); now it's ok, around 13.5 volts; after this the situation with radio became worse, so I understood it's voltage dependant: if voltage it's too high, radio shuts down; sometimes it doesn't work but if I switch on everything (high beams, etc) it starts.
Original post Read captured discussion
PCM radio malfunction due to voltage

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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.

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

Rennlist: 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: 20261026T112012Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I always had issues on my 1999 996 with PCM (1st gen) sound system: normally it doesn't work with cold engine then after some time starts to work. Few months ago I had to replace the voltage regulator (with warm engine voltage started to go below 12 on dashboard gauge); now it's ok, around 13.5 volts; after this the situation with radio became worse, so I understood it's voltage dependant: if voltage it's too high, radio shuts down; sometimes it doesn't work but if I switch on everything (high beams, etc) it starts. Anybody with this problem? At this point I plan to add an addition 12 volt regulator in the power lines of the head unit. Any thoughts / ideas?

POST 2Original post

Take it out and have it checked over by a competent radio or electronics repairer. Its a Becker unit so anywhere that has experience with Becker should be able to help. I'd do that before touching the car.

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