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Diagnostic Mode???

Old Mar 7, 2016 | 06:29 PM
  #1  
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too tall
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From: Rockville, MD
Default Diagnostic Mode???

After a 2 hrs. fast drive. I parked my '07 911s for 30 mins. than restarted and it cranked slowly and did not start. I reset the key position and same result however i *think* I saw "Diagnostic Mode" displayed on the dash. The third restart was normal and everything fine, no faults.

The battery is 5 years old. I'm replacing it tomorrow just for drill.

If anyone has a clue, it might be reassuring!
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Old Mar 7, 2016 | 06:56 PM
  #2  
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Rikky001
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Originally Posted by too tall
After a 2 hrs. fast drive. I parked my '07 911s for 30 mins. than restarted and it cranked slowly and did not start. I reset the key position and same result however i *think* I saw "Diagnostic Mode" displayed on the dash. The third restart was normal and everything fine, no faults.

The battery is 5 years old. I'm replacing it tomorrow just for drill.

If anyone has a clue, it might be reassuring!
Diagnostic mode shows up when battery voltage drops very low, on a dead battery for example. Might be battery, or starter/ alternator cable if it is difficult to start with a warm engine. Report back if the new battery cured the problem.
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Old Mar 7, 2016 | 09:32 PM
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Thanks Rikky will do. New battery ordered. Barring bad luck I'll have it in tomorrow.
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Old Mar 9, 2016 | 09:42 AM
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Default

Interstate MTP-H7 (exact match) installed.

So...THAT'S how it's supposed to crank

Are terminal covers necessary? There were none however it is not hard to fashion something.

Thanks Forum

Last edited by too tall; Mar 9, 2016 at 12:17 PM.
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