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I have a 2001 cadillac deville that won't start. I get code p1639 and when I try to start it all my lights inside flicker my speakers make weird sounds an my compresure makes weird sounds its like there's not enough power. I check my battery. It's fully charged and my posts are very clean. My reading says richtazz 09-01-2010, 01:52 PM P1639 - PCM 5 Volt Reference signal (B or 2)

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  • Robert Wood
    Robert Wood Aug 29, 2017

    What compressor are you speaking of ?

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  • Cars & Trucks Master
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Something is taking away , by a short usually, the 5 volt reference signal from the PCM causing your issues .

Posted on Aug 29, 2017

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Posted on Jan 02, 2017

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fordexpert

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SOURCE: 2001 ford focus will not start. The engine will

I will try to help you. You are correct about the starting fluid, if it has fire starting fluid should do something. So the problem must be either no fire to the plugs or the timing belt is broke.

Check to see if the plugs have spark. If they do not, then get with the Autoparts store and ask if your car needs a Ignition relay to run. Then ask if your car takes a rubber timing belt. If your car does not have a rubber timing belt try the Ignition relay. If you do have a rubber belt check behind the shield in front of the engine to see if the timing belt is broke.

The timing belt is different than the serpetine belt that drives the pulleys. Cars with rubber timing belts have both belts. Should your timing belt be broken it is not an expensive repair. But you will need to details on replacement of that part.

Posted on Apr 18, 2010

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