battery light came on and the my car stalled

2004 BUICK RENDEZVOUS
107,274 MILES • 6 CYL • AWD • AUTOMATIC
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FERNGULLY
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this problem is kind of hard to describe because i was driving my car on a gravel road and the battery light came on and the my car died and would not start after that, we have changed the alternator and also checked the battery but still can't figure out what is wrong. please help?
Nov 6, 2008 at 4:19 PM
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KASEKENNY
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Does the engine turn over and not start the engine? Or does the engine not turn over when you turn the key?

Here is a guide that will help with this:

https://youtu.be/dCjmRL3p4Cs

I suspect if the engine is turning over that we haven a spark or fuel issue. Basically we need to start with checking the fuel pressure and see what it is and we can go from there.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If the fuel pressure is low then this will cause the issue. If this is the case then there could be an issue with the PCM as that would explain the charge light as well as the PCM controls this system as well.

Take a look at the wiring diagram below and we need to check the relay control from the PCM and make sure it is grounding the relay.

https://www.2carpros.com/articles/how-to-check-wiring

If not then the PCM is most likely the issue.

Please run through this info and let me know what questions you have. Thanks
Aug 25, 2021 at 7:16 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.