Vehicle had been running. Had a cold snap with single digit temperatures...vehicle hadn't been started for 4 or 5 days. .tried to start it, wouldn't start. Had it towed to a Chev dealership, they put a code reader on it, showed P0621, they said we needed a new battery and alternator. Bought both and had them installed. Still won't start. Had old alternator tested, it is still good.
This is not that clean cut, ECM failure is not that common. The battery died and that caused the no start. This could also account for the setting of that code because of loss of field charge in the alternator. A dealership can write off parts that are not bad, if they did not do the work, you are stuck with the parts. ECM is not cheap. I would check the CPS first.
Testimonial: "What is the CPS? Location?"
SOURCE: Charging system
change your battery cables and check all wires on the alternator for loose connections, expecially the grounds.
SOURCE: vehicle needs to be jumped to start,battery/alternator fine.
E-mail me back to sign up for my platinum plan and I'll tell you how. I thought this service was free. Sorry to have signed up. Please take me off your list...
SOURCE: Charging Light On After Replacing Alternator/Battery1999Windstar
Hi, I can't tell you exactly what is wrong because there is too much involved at this point, what with 2 shops working with it, but I can give you some advise on what else to check. On the alternators and the wiring that supports them a small volt charge is taken off one of the slip rings, where the brushes ride, for the purpose of turning out the light. As I remember, this is a yellow wire that runs back to the dash.
To the alternator, it would be one of the wires that plug into the side of the alternator case.
jetski
SOURCE: 2000 olds sillouette, headlights on, no brake/turn signal light
i would chk. break light switch. should be under dash above break pedel arm. emergency flashers will be on its own fuse, turn signals should have own fuse. as far as interior lights surging that could be ground or alt. chk. battery cables make sure clean and tight. not good idea unhooking bat. cable when running, one spark or surge to computer could burn up computer. besides that realy won't tell you anything if a diod is bad in alt. it may not show up until you tax the system. its best to take it someware like autozone, or any major auto parts store and have it chk.
SOURCE: 96 Grand Am SE2 2.4L starts and dies immediately
I had the SAME thing with my car!! Remove your air bag module its a grayish looking box that deploys your air bags, my air bag light was on but it was on and off. I pumped gas in my car one night and when i went to crank it my car cut right off after a split second. My mechanic took time on it but discover that it was a secrity issue. He removed the air bag module and presto it fired right up. I thought it was a fuel filter or fuel pump. It was just the air bag module, people freaked out about it once i told them what it was....it should be under the passenger seat, i believe u may have to take out the seat to get to it.
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