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Re: 99 chevy express 5.7 when hot won't start
computer/PCM/VCM code 604 is vcm ram memory / bad computer VCM.
There is no saftey mode.
It is bad when you get that code.
But feel luckie you got a code.
Computers do not often throw a bad computer code.
They usually Just go bad and do not say a word.
You might want to clear code and see if it returns.
If so replace the VCM and it will need reprogramed for you VAN.
Also do the fuel pressure test after the computer replace 55 lbs is way to low.
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Remember proper testing gives us the answer to many problems.
MT
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