Hi, my PCM radio unit has developed a problem. I'm driving, the screen suddenly goes blank, buttons stay illuminated, no sound. Porsche screen comes on, goes off again, buttons illumination goes off. Periodically the Porsche screen comes on again and goes off. All this time the mini computer screen states which radio channel I was listening to at the time it went off. Switching the unit off and on makes no difference, other than the small screen saying 'radio off'. When I stop the engine, remove the key, reinsert and restart the engine the radio unit operates normally. Problem reoccurs after a short while. I read somewhere this is an ignition switch issue but surely this would just turn the unit on and off, not make it do what i've described? 2003 996 C4S Tiptronic.
Discussion summary
YOUR RESEARCH996 C4S Radio problem
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 2 captured posts examined · 0 partial discussions
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.
2 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.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
Switching the unit off and on makes no difference, other than the small screen saying 'radio off'.
No unique explicit quoted action; no causal link assigned
Generation: 20261027T013556Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
It's either a poor connection with the 12 volt feed .. which i doubt or a problem with the Pcm .. which i have seen .. a garage job im afraid for them to diagnose as short of hooking up a voltmeter and trying to watch it whilst driving and the fault happening is not advisable .
This is a source reference. Confirm exact model applicability in the original material.