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Discussion summary
YOUR RESEARCHOh no! 996 C2 won't start - battery?
Leading reported evidence
Replace ; there isn't a receipt
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed · Original poster
AFAIK it's never been changed; there isn't a receipt for it in the service history and it looks to be the original Porsche item from 2003 (can't see a date on it but the two bolts holding it in don't ever look to have been touched).
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
I'm going to check the battery shortly as ppl on here are suggesting but to be honest I cant see that being the problem as the voltage appears fine and the car starts at first turn.
Leading evidence: 'Replace ; there isn't a receipt' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check battery shortly as ppl' (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.
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Performed · outcome unconfirmed
I've changed the battery in the key fob to no effect.
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
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Performed · outcome unconfirmed
ive got a porsche battery was fitted new in Jan 2010 by Porsche and its failed allready, was draggin its ass on starting so replaced with a Varta F18 off good ol flea bay for 99 pounds delivered, 5 yrs warranty cant be bad..
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
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Performed · outcome unconfirmed · Original poster
The car is used daily for 20 mile each-way commute, and I went down to Coventry yesterday (100 miles each way) so it's not been used for short journeys and there have been no warning signs recently (difficult to start etc.).
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
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Suggestion
I'm going to check the battery shortly as ppl on here are suggesting but to be honest I cant see that being the problem as the voltage appears fine and the car starts at first turn.
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 shortly as ppl
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
I'm going to check the battery shortly as ppl on here are suggesting but to be honest I cant see that being the problem as the voltage appears fine and the car starts at first turn.
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
When you change the battery, turn the ignotion on (but don't start the car), and switch off as many loads as you can (aircon, radio, etc) before you disconnect the negative terminal.
Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
AFAIK it's never been changed; there isn't a receipt for it in the service history and it looks to be the original Porsche item from 2003 (can't see a date on it but the two bolts holding it in don't ever look to have been touched).
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
When you change the battery, turn the ignotion on (but don't start the car), and switch off as many loads as you can (aircon, radio, etc) before you disconnect the negative terminal.
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
ive got a porsche battery was fitted new in Jan 2010 by Porsche and its failed allready, was draggin its ass on starting so replaced with a Varta F18 off good ol flea bay for 99 pounds delivered, 5 yrs warranty cant be bad..
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.
15 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: 20261026T100758Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I came home from work today, got changed to go to the gym, and the car won't start (2003 996 C2). It just about tried to turn over, and for some reason both windows moved down and up as if the doors had just been opened / closed. The trip computer has also reset. Voltage is showing as just under 12v on the dash gauge. :nooo:
The car is used daily for 20 mile each-way commute, and I went down to Coventry yesterday (100 miles each way) so it's not been used for short journeys and there have been no warning signs recently (difficult to start etc.). I'm happy to accept that the battery is dead (it looks to be the original battery from 2003) and just buy a new one, but is there anything else I should be looking for? :dont know:
I've left it plugged it in to a charger for now...
AFAIK it's never been changed; there isn't a receipt for it in the service history and it looks to be the original Porsche item from 2003 (can't see a date on it but the two bolts holding it in don't ever look to have been touched).
I don't mind picking a new one up tomorrow, just wondered if I should check anything else too - I would have expected a bit of warning before the battery went, it just seems to have died very suddenly!
If it's the original Porsche (Moll) battery, you have done well with it. 4-5 years is normally the best you can expect from them.
If you have a hydrometer, check the SG of each cell. Have you checked the levels? One cell dry, perhaps?
Yeah, it says MOLL Kamina on the top, I'm pretty sure it's the original. 7 years and 42k miles out of it, not bad!!
Nope, don't have anything like this, sorry! It's showing as fully charged now (after approx 5 hours), I'll see how it is in the morning - I have a mate on standby for a lift to work if required, and I'll pop and get a new battery at lunchtime; easy enough to fit myself, yeah, just looks like a bolt either side holding it in?
Hope it is just the battery and nothing more serious... :roll:
Worth checking the electrolyte levels though.
When you change the battery, turn the ignotion on (but don't start the car), and switch off as many loads as you can (aircon, radio, etc) before you disconnect the negative terminal. This stops the alarm siren sounding. Leave the key in that position until after you have re-connected the battery.
Ah, sorry I see now - so one of the cells might be dry and I might just need to top it up rather than get a new battery? Sorry I get you now!
Good tip that, thank you! :thumb:
What should the SG be ? ive got a porsche battery was fitted new in Jan 2010 by Porsche and its failed allready, was draggin its ass on starting so replaced with a Varta F18 off good ol flea bay for 99 pounds delivered, 5 yrs warranty cant be bad.. so i have a dead or dyeing battery here, would like to confirm before i stroll into porsche, incase they are just all *****, looking at service history it had another battery in 2007 so life spans are 5 yrs, 3 yrs and 6 months.. pants eh !
If its 7 years old and has just been deep discharged, I'd change it anyway. You might get another few months out of it but sods law says when it gives up next you will be away from home and your charger and it will be a nause. I put in a Halfords HCB096 which came with a four year guarantee and saved myself a lot of hassle.
Still won't start this morning. Battery fully charged, all electrics work (as they did yesterday) so interior lights, radio, air-con, lights etc. will come on no problem, but when I try to start the car it just seems to lock / unlock the doors really quickly and drop / lift both windows over and over. Strange. :dont know:
I will pop and get a new battery anyway (maybe there is enough charge to power everything but not to start it?), but is there anything else I can check? And does anyone know any good auto-electricians in the Manchester area...?
I had the same problem last Tue 20th. Out of nowhere after driving somewhere in the pouring rain with a lot of surface water, I stopped the car and then suddenly it just wouldnt restart and the passenger window started going up and down continuously. I managed to restart the car and get home.
Since then the car has behaved normally, with the exception that the key fob no longer opens the car remotely? Central locking works fine within the car from the dashboard switch but the key does not. I've changed the battery in the key fob to no effect. I'm going to check the battery shortly as ppl on here are suggesting but to be honest I cant see that being the problem as the voltage appears fine and the car starts at first turn. I can only assume that this is some sort of electrical/water issue or short circuit somewhere? I'll let you know how I get on with the battery checks... Failing that I'm off to the auto-electricians.
Picked up a new battery from OPC Wilmslow (£177; Halfords Bosch equivalent was £130 but they had none in stock), fitted this afternoon and seems to work a treat - problem (hopefully) solved.
Thanks for all the input (especially Richard re: leaving ignition on throughout - meant I didn't even need to re-enter the radio code). :thumb:
