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S-Type / S type R Supercharged V8 ( X200 ) 1999 - 2008 2001 - 2009
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No start, had multiple misfires before it stopped starting

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Old Jan 24, 2025 | 05:17 PM
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Originally Posted by JagV8
Seriously P0603, that's not a typo?

Never seen it, but I think it would mean things like fuel trims won't be kept once learned and maybe monitors won't stay set as they should. Maybe will just run OL (open loop)?
Sorry I forgot, no it's not a typo, P0603 = error in keep alive memory
 
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Old Jan 24, 2025 | 05:23 PM
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Originally Posted by JagV8
Could be worth looking at the Workshop manual as it may have tests for P0603.
Yes the manual says it could be a weak battery a bad or dirty power or ground connection or bad ECM. That's why I was wondering if it's due to me not programming the ECM correctly. But I'm going to reset & check all connections before I go switching ECM back again
 
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Old Jan 25, 2025 | 02:38 AM
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I am fairly sure it can't be bad programming.

A bent pin in a connector or disturbed wire, more likely. Look for pinpoint tests.
 
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