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07-01-2013, 01:45 PM | #1 | |
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2004 Malibu Intermittant Battery Light
I have a 2004 Chevy Malibu Maxx that randomly dings and shows me the battery light.
It usually happens when going uphill or during really hard accelerations. It is also showing OBDII code P0621. The car has no other issues. Always starts, always runs well. What causes this problem? Where should I start looking? I'm thinking it's probably a bad connection somewhere. |
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07-01-2013, 02:39 PM | #2 | ||
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Re: 2004 Malibu Intermittant Battery Light
Quote:
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07-01-2013, 06:38 PM | #3 | |
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Re: 2004 Malibu Intermittant Battery Light
Do you happen to know which pins I can check on the PCM connector?
I don't have a service manual for this car :-/ |
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07-02-2013, 08:36 AM | #4 | |
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Re: 2004 Malibu Intermittant Battery Light
Does your vehicle have a voltage gauge? If yes, what is the voltage when your light comes on?
If the voltage is dropping, then you either have an alternator or PCM problem.... |
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07-14-2013, 06:04 PM | #5 | |
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Re: 2004 Malibu Intermittant Battery Light
Update on this issue:
I shielded the + alternator cable that runs under the ignition wires to the battery. I used aluminum foil 4 layers thick and grounded the shield to the engine. I've checked it for proper ground using an ohm meter several times. It's definitely working. The problem seems to happen less, but it still happens. I installed a volt meter inside the car and watched it while I was driving. When the battery light comes on the voltage does not change at all. It's right about 15v the whole time. I'm using an analog meter, so it's hard to tell exact voltages. but it's accurate within a volt or two. I connected the meter between engine ground ( right behind the alternator bracket ) and the + battery cable at the alternator. I tried re-creating the problem by wiggling the wiring harness around, but have failed to do so :-/ Still looking for a solution |
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07-14-2013, 06:05 PM | #6 | |
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Re: 2004 Malibu Intermittant Battery Light
Update on this issue:
I shielded the + alternator cable that runs under the ignition wires to the battery. I used aluminum foil 4 layers thick and grounded the shield to the engine. I've checked it for proper ground using an ohm meter several times. It's definitely working. The problem seems to happen less, but it still happens. I installed a volt meter inside the car and watched it while I was driving. When the battery light comes on the voltage does not change at all. It's right about 15v the whole time. I'm using an analog meter, so it's hard to tell exact voltages. but it's accurate within a volt or two. I connected the meter between engine ground ( right behind the alternator bracket ) and the + battery cable at the alternator. I tried re-creating the problem by wiggling the wiring harness around, but have failed to do so :-/ Still looking for a solution |
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07-14-2013, 06:06 PM | #7 | |
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Re: 2004 Malibu Intermittant Battery Light
I installed a volt meter inside the car and watched it while I was driving. When the battery light comes on the voltage does not change at all. It's right about 15v the whole time. I'm using an analog meter, so it's hard to tell exact voltages. but it's accurate within a volt or two.
I connected the meter between engine ground ( right behind the alternator bracket ) and the + battery cable at the alternator. I tried re-creating the problem by wiggling the wiring harness around, but have failed to do so :-/ Still looking for a solution |
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07-14-2013, 06:07 PM | #8 | |
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Re: 2004 Malibu Intermittant Battery Light
I installed a volt meter inside the car and watched it while I was driving. When the battery light comes on the voltage does not change at all. It's right about 15v the whole time. I'm using an analog meter, so it's hard to tell exact voltages. but it's accurate within a volt or two.
I connected the meter between engine ground ( right behind the alternator bracket ) and the + battery cable at the alternator. I tried re-creating the problem by wiggling the wiring harness around, but have failed to do so :-/ Still looking for a solution |
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07-14-2013, 06:10 PM | #9 | |
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Re: 2004 Malibu Intermittant Battery Light
I installed a volt meter inside the car and watched it while I was driving. When the battery light comes on the voltage does not change at all. It's right about 15v the whole time. I'm using an analog meter, so it's hard to tell exact voltages. but it's accurate within a volt or two.
I connected the meter between engine ground ( right behind the alternator bracket ) and the + battery cable at the alternator. I tried re-creating the problem by wiggling the wiring harness around, but have failed to do so :-/ According to my Haynes manual code p0621 means: alternator L-terminal circuit. What does that mean? I don't see it labeled on a schematic anywhere in the book :-/ Still looking for a solution |
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07-14-2013, 07:27 PM | #10 | |
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Re: 2004 Malibu Intermittant Battery Light
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07-15-2013, 04:19 PM | #11 | |
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Re: 2004 Malibu Intermittant Battery Light
Does the Horn work? The Alternator and Horn seem to be on the same circuit!
Did you change Spark Plugs with aftermarket ones? I know it sounds weird but theres info on it here http://www.hptuners.com Seem to be an issue with Vettes, but it may help you diagnose better. Seems to be a problem with Diesel Trucks too! I would take the Alternator out and take it to AutoZone or Advance Auto and have it tested. If it checks out good, you can move to wiring and PCM.
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2004 , battery , chevy , light , malibu |
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