Question about 2004 GMC Sierra

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Voltmeter read high on the 2004 sierra and new battery put in

The voltmeter will go to high went the engine is stared. we have put new battery in it

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Alternator is charging to high. need to replace it

Posted on Nov 22, 2013

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Posted on Jan 02, 2017

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SOURCE: tac not working voltmeter went to 19 volts then

Akternators for a 12 volt systum charge at 13.5 when running from 800rpm to max ??4000rpm and shouldent change as the alternator put out AC current and coverts to DC in the reg on alt but max of 13.5 is all you need at any time at all revs and the battery will not boil or over heat..
Make of truck dont make any differance and milage dosent either as its the alternator thats either faulty or regulator is.
Let me know how you get on Ron

Posted on Oct 26, 2009

bschilz
  • 2049 Answers

SOURCE: I am getting codes Po449 and P0455 on my 2004 GMC

This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Assuming you put on the proper gas cap and one of high quality, I would inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary.

Posted on Mar 12, 2010

  • 121 Answers

SOURCE: Jimmy would not start, voltmeter read 9. After

sounds either like your alternator is bad, if it still goes dead then i would go with the alternator, other wise a cell or two could be bad or shorted in the battery.

Posted on Jun 25, 2010

Testimonial: "I'll try a battery first although it's only 2 years old."

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Mass air flow sensor voltage high


Hot-Wire-Type MAF Sensors
  1. To check the MAF sensor's voltage signal and frequency, connect a voltmeter across the MAF voltage signal wire and ground wire.
  2. Start the engine and observe the voltmeter reading.
  3. On some MAF sensors, this reading should be 2.5 volts.

Sep 29, 2016 | 2004 Hyundai Santa Fe

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Installed new battery. Now lights are burning out. Was told may need a reset so battery and alternator are on the same page. Is there a code I can use or something?


Changing a battery will have no affect on lights burning out. If the voltage regulator inside the alternator is bad this could cause lights to burn out as it will cause too much voltage to be produced unregulated. If this is so, the check engine light will be on and the charge gauge will be high and you may smell the battery overcharging. Hook up a voltmeter to the battery. It should be around 14.1-14.6 volts. If within this reading, your problem is most likely coincindental

Nov 15, 2015 | 2008 GMC Sierra 1500

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When the engine is in low rpm the battery light comes on and when on high rpm light go off. Check belt ok,check voltage with voltmeter at high rpm its 14 volts I don't no what's the pr


sounds like the freewhell clutch on the alternator is worn and not spinning the alternator fast enough at low revs to put a charge into the battery.

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My 2004 GMC sierra Denali pickup battery drains


After you get the truck started disconect you battery cable and see if the truck continuse to run. if it dies you are having a problem with the charging system. make sure dont have any interior lighs left on.

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New battery and new starter but still will not crank only clicks


More than likely the charging system is not working and allowing the battery to run down/low. Put a voltmeter on the battery and raise the engine about 2000 rpm and the battery should read 13.5-15.5 volts with all electronics on (fans switch on high, flashers, wipers, headllights, defrost etc). It should also read about 13.5 volts at idle but may not depending on the load from the accessories and voltage regulator. Most important is that it will read 13.5-15.5 volts when the engine is at 2000 rpm with the accessories on. If it does not read in that range the charging system(alternator most likely) has a charging problem.

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sounds like the alternator

Nov 07, 2012 | 1993 GMC Sierra C3500

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Hi i am working on 03 gmc sierra it has a battery warning light on .when you put the key in the ignition and turn it to on the voltmeter does not move. if you go to start it . it turn over but does n


Check the voltage coming out of the alternator with engine running it should be 13-15 volts.If its not within these specs then replace the alternator.

Jan 31, 2012 | 2003 GMC Sierra 1500

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I am getting codes Po449 and P0455 on my 2004 GMC Sierra 1500. I put a new fuel cap and then had the computer reset. The engine light went away but came back later that day. What do you suggest I do nest?


This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

Assuming you put on the proper gas cap and one of high quality, I would inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary.

Mar 12, 2010 | 2004 GMC Sierra 1500 Crew Cab

1 Answer

Tac not working voltmeter went to 19 volts then rh@stayed ther just purchased 2004 gmc1500 sierra . tac@voltmeter siezed low. gm dealer did sweep volt showed16volts tac dead 2days later voltmeter went...


Akternators for a 12 volt systum charge at 13.5 when running from 800rpm to max ??4000rpm and shouldent change as the alternator put out AC current and coverts to DC in the reg on alt but max of 13.5 is all you need at any time at all revs and the battery will not boil or over heat..
Make of truck dont make any differance and milage dosent either as its the alternator thats either faulty or regulator is.
Let me know how you get on Ron

Oct 26, 2009 | 2004 GMC Sierra

1 Answer

2004 GMC Sierra High Oil Pressure


if it is electrical oil pressure sensor I would start there. The best way to see if you have a major problem is to use a mechanical oil pressure tester. Take off the oil pressure sensor and put the mechanical tester on. The tester should come with a Gage. If it comes within your trucks oil pressure range than all is fine and replace the sending unit and see if that don't help your problem.If the tester runs high then the oil pump is bad or your cam-bearings could be the problem. But with cam-bearings you would usually get a low reading.

Mar 14, 2009 | 2004 GMC Sierra 1500 Crew Cab

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