Question about 2004 Volvo S40

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Error message:service urgent.power supply! Battery light shows. Had the battery tested and it's charge is correct,so the alternator must be working. Why does this error message keep coming on and then disappearing?

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6ya6ya
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Posted on Jan 02, 2017

nascarschool
  • 54 Answers

SOURCE: Volvo 240 wont hold charge

if with the volt meter the amps go down while running and at increased rpms than your alternator is not charging right

Posted on Mar 11, 2009

  • 5 Answers

SOURCE: original battery 600 cca tested showes 580 amps

i had the same problem it turned out the battery just needed replacing if its not that then the next thing to check is your battery cables and see if there is alot of corrosion on them that can also factor in. the last thing id suggest checking is your battery terminals. hope this helps

Posted on Aug 02, 2009

  • 1071 Answers

SOURCE: '02 S60, A warning stays on

you need to take it to volvo dealer to reset the light srs detects low battery voltage and turns on the light

Posted on Aug 18, 2009

dmsr63
  • 2050 Answers

SOURCE: My battery keeps going dead. I had battery tested

The code could be your computer sensing a low voltage. It sounds like you have a draw somewhere in the car from something. Like a trunk light, glovebox light or something to that idea. Look at some of these, including under the hood if you have a light there also. To verify a draw you need to hook up a meter in siries through the battery negative cable. Start by looking around to see if it's something simple.

Posted on Sep 08, 2009

Zim1308
  • 543 Answers

SOURCE: low battery voltage light battery won't hold charge 2002 S60

Agreed, you can do one of two things. Replace the alternator, or get some new brushes and try out your soldering skills. Good luck.

Posted on Nov 28, 2011

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1 Answer

2012 Grand Caravan. How do I turn the battery light off after installing a new battery?


Test the alternator. The battery light is for the charging system. Once the charging system is working with the engine running, the light should go off. If your light stays on with engine running, the alternator may need service or replacement.

To test the charging system, just put a voltmeter on the battery with engine running. The voltmeter should register at least 13.5 volts- alternator is charging. If you only show battery voltage with engine running, like 12.2-12.8 volts, the alternator or charging system is not working. The battery light should be on to signify this.

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Problem with lights on my tracker it drain's my battery i have a good altnator on it


If the lights drain the battery when the engine is running, then you have a bigger problem of the alternator not charging, not working. When the engine is running, the alternator supplies all the current to run the car's electrical systems, while also charging up the battery for the next start-up. If you know the alternator is good, then maybe a fuse or fusible link has blown, preventing the alternator from working. To check, put a voltmeter on the battery with engine running-it should show over 13.5 volts if the charging system is working. If the alternator is not putting out, the voltmeter will read same voltage on the battery as when the engine is not running. A fully charged battery should show "around" 12.6 volts. A discharged battery will show less than 12 volts. That should give you an idea of the range to look for on a voltmeter. I believe some parts stores will check the voltage for free. I know most stores will test the alternator and battery for free if brought into the store, but you need the voltage read while on the car and engine running. If the system is charging normally and the lights kill everything, you may have a short in the lighting system.

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"Check Charging System" message.


If you know for a fact the battery and alternator are good, the problem would be in the wiring between the two. You should have battery voltage at the alternator with the engine off.
Check for voltage at the alternator and the starter cables. There are fuseable links that look like regular wires but have fuse wire inside.

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Hello, the battery light on your Ford is controlled by the voltage regulator. If the light is on it's indicating the battery is not charging, and is being discharged. If you have a volt meter you can test at the battery. With the engine running the voltage should read at least 13.5vdc. If it's lower than that, the alternator is not charging, or the charge is not reaching the battery. Another simple test, is remove the negative battery cable, if the engine dies the alternator is not charging. Autozone will test your alternator and your battery for free, if you do not have any test equipment. If you just replaced the alternator and it failed the test, it should be under warranty. Same with the battery.

I hope this information is helpful.

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Daughter called me ..car wont start. checked battery at Autozone...it is good. someone stopped to help them and bang on startere and it starts up. Bad starter. Starter replaced. Next day daughter...


it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.

good luck

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Battery warning low charge on 3 series BMW - light showing battery and statement in nav screen - just came on out of the blue? The car is 4 years old is it the battery or the alternator?


disconnect the battery with the car running if it dies then its the alternator. You can also dive it to an auto parts store and they will check the charging system for you, it a free service Tim

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Chevy Suburban 1500 -- Battery Not Charging Light....Replaced Alternator....Still had battery not charging light....Replaced battery....Still have battery not charging light...also first time seen service...


Make sure that you buy a 'lifetime' warranted alternator from your parts source to avoid problems with bad alternators out of the box. I would try to return and exchange the alternator with one that tests out ok on a bench, in order to verify if the wiring in between the alternator or the alternator itself was bad.

Service brake booster would have to do with the vacuum or power booster problem around the master cylinder for the braking system. That wouldn't have anything to do with the alternator, I do not believe.

Good luck on these repairs.

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My daughter has a Volvo S40 (2006). The Power System Service Urgent light with a red triangle with an exclamation mark and the Battery sign with plus and minus signs came on. She kept driving and then...


This occurred to me the other day. They thought it was the alternator and battery, but nothing. What was the problem with her car. Please help, I'm going nuts trying to figure this out!

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I have a 1994 cadillac sedan deville with a 4.9 engine. The message center in the instrument cluster says the voltage is too high. I have replaced the alternator but still comes on . Maybe you can help me....


The first thing to do is have the battery tested and then the charging system checked, this will show you if its overcharging,if it is overcharging then take a look at the wiring going to alternator,and also a bad battery can also cause a problem so first find out if message center is displaying the correct message, this will show if center is okay then move on to battery testing then alternator test, there may be a problem with the wiring or a defective alternator.

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What does power system service urgent message mean on 2005 volvo S40? is it still safe to drive?


Posssible charging system fault. Alternator/battery etc. If the battery is not charging and you use vehicle it will breakdown

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