5 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWet ECU / Blocked Drainage Channels - Page 1 - Boxster/Cayman - PistonHeads UK
Reported or suspected cause
first post
Reported cause
No successful repair reported for this finding.
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Identified cause
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Suspected cause
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Reported fixes
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 report identifying a cause
1
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Reported cause · Original poster
Haven't posted on here before and annoyingly a problem is my first post.
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Also do the front ones by the battery tray and you might as well check the front carpets and door card carpet to see if your door membranes are still intact.
Leading evidence: 'first post' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'first post' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check front carpets and door card carpet' (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.
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
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Suggestion
Also do the front ones by the battery tray and you might as well check the front carpets and door card carpet to see if your door membranes are still intact.
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
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Suggestion
You need to get a camel back or similar and clean through the drain holes under the rear clam shell.
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
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Suggestion · Original poster
Meant to say am based in north London if anyone can recommend anyone to help.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check front carpets and door card carpet
No successful repair reported for this finding.
0
Reported fixes
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Unsuccessful attempts
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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
Also do the front ones by the battery tray and you might as well check the front carpets and door card carpet to see if your door membranes are still intact.
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.
5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261027T082735Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi
Haven't posted on here before and annoyingly a problem is my first post.
Have a 2005 Boxster and the other night when I came home from work the alarm was going off, brake lights constantly on, horn sounding, windows going up or down, convertible top automatically opening/closing etc all without the key in ignition. Comically at 10pm on a wet night I was sat in the car with the roof down and horn blaring whilst all the neighbours peered out of their windows.
AA diagnosed the problem as water getting into the car by blocked drainage channels behind the rear window which has also collected into the ECU well causing it to malfunction. Apparently a known issue.
At present the car is sitting outside with a tarpaulin covering it with the battery disconnected.
Have managed to get the water collected in the well out but the carpet underlay is soaking wet.
Wondering if anyone else has had the same problem and how they sorted it?
Spoke to Porsche Stratford on the phone and they said without looking at it they couldn't accurately price up the job but said it could be up to £1,300. Just got engaged so terrible timing when supposed to be saving.
If I were to get it professionally dried out by an outfit that offers this service, and get the drainage unblocked, what are the chances that the ECU will need replacing? If so, is it possible to get someone independent to source and fit it rather than having my trousers pulled down by Porsche.
Thanks in advance
Glenn
You need to get the unit from under the passenger seat out, cleaned up and dried quickly before there is any corrosion. Get the carpets out and hung out in your garage for several days and perhaps with a dehumidifier. The carpets might feel dry now but they will still be sodden underneath. You need to get a camel back or similar and clean through the drain holes under the rear clam shell. Also do the front ones by the battery tray and you might as well check the front carpets and door card carpet to see if your door membranes are still intact.
One of my customers pointed me to your post Glenn.
Unfortunately it is very common. You can see from the photos below how bad this gets. From what you described it sounds like the rear main control unit is damaged. I think £1300 is pretty much the minimum....it is a labour intensive job. Porsche are not trying to rip you off here...it could be more and they are just covering themselves.
Ken
hi I had the same problem, I bought a second hand ecu and engine ecu also came with fob,both ecu`s easy to change and slid my old key into new fob worked a treat and only cost me about £200,hope this helps
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