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What does it mean charging voltage is above the acceptable limit?

2004 GMC envoy 4.2L battery drain over night from 12.03 to 12.00 will the above charging voltage acceptable limit cause battery to drain over night or voltage drop how do i fix this problem? i clean the battery cables.

Posted by Joe Russell on


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JonSnell Electronic

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  • GMC Master
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The maximum battery charge voltage for modern Lead Acid batteries is 14.4volts. Anymore and it may damage the plates causing a discharge condition due to lead oxide shorting out the plates.In my 1958 Series 1 Land Rover, I removed the plates from the glass battery box and cleaned them, refitting and sealing with pitch. Filling up with fresh acid and a recharge cures that issue.Modern batteries do not allow for that due to the mass production.Repair the overcharge issue first, then replace the battery.

Posted on Feb 28, 2019

Testimonial: "i left the battery cable off overnight volts was 12.00, when i check the volt this morning the volts was 11.99 but the volts drop a lots below that number when the cables are connected could the generator be draining the battery? i need to know what to do to fix the problem."

  • JonSnell Electronic
    JonSnell Electronic Mar 01, 2019

    If there is a discharge issue and a battery issue, the battery if charged should read at least 12.6volts if left standing overnight, not less than 12; battery suspect. The vehicle drains the battery all of the time due to the electronics, alarm and systems. There could be an extra leak from maybe an interior glove box light etc. I would check or replace the battery first.

  • Joe Russell Mar 01, 2019

    i replace a new battery, i check for lights on at night but i don't see any on how do i check for battery drain with a ammeter or test light?



Peter Lee

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The answer usually lies with the voltage regulator on the alternator that limits output when 14.4 v is reached.

Posted on Feb 28, 2019


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SOURCE: battery removal on a 2004 GMC Envoy

The battery is on the right side behind the fuse box. You need a metric set to undo the 3 screws. Theres one that attaches to the body, one to the bar that goes along the top, and theres one on the left side below the vacuum hose and air induction. After you've taken out those three, you should lift the whole thing out(battery and shroud) together. It's hard to take the shroud off before you lift the battery out. After that, you have to pry the shoud off the battery. The two terminals in the back make it hard. Then just go to any auto parts store and they'll give you a new one. 

Posted on Jan 28, 2009


  • 2 Answers

SOURCE: Speedometer on 2004 GMC Envoy not working. It

There is a recall on the panel Cluster... call your dealer and have it checked out.. mention the recall...

Posted on Jun 05, 2009


  • 238 Answers

SOURCE: I have a 2004 Gmc Envoy putting out a code of 0128

It means the car has not reached operating temp. The computer wants the engine a certain temp so it can go into "closed loop" where it fine tunes the fuel mix for optimum economy and emissions. If it cannot reach that temp it sets that code. You either have a low coolant level or a stuck open/missing thermostat.

Posted on Jan 10, 2010


  • 1311 Answers

SOURCE: 2004 GMC Envoy with a P0526 sensor problem

This code indicates a problem with the fan clutch, the speed it is running is not the speed it was commanded to run/ The fan clutch assembly needs replacing.

Posted on Sep 09, 2010


Ryan Lutton

  • 1255 Answers

SOURCE: PO606 in 2004 GMC

PCM Processor Fault. A couple of things, check the wiring around the PCM, check for frays in the wiring. There is a Technical Service Bulletin for this problem also, where your pcm would need to be re-flashed (computer update) by the dealer, I believe it's around $100 to do this.

You can also try to disconnect the battery for 30 minutes or so to reset the computer. Some people have just cleared the code by doing this (or with a code reader) and the code never showed back up again.

Posted on Mar 19, 2011

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