Question about 2006 GMC Envoy

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2006 GMC Envoy has 2 problems. I thought the alternator was going bad because of some battery problems. Pulled it out and had it tested. Nothing wrong with it. The biggest problem is a loud whine when I accelerate. Could it be another pulley? When I was working it I noticed the smell of fuel. When I started it there was a small amount of fuel spraying above the alternator. What could it be?

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The whine could be a pulley, start the engine, raise the hood, and then rev the engine to see if you can duplicate the noise. It could be a weak belt, or a bad bearing in either the alternator, or a pulley when the engine is under a load. Check your fuel lines and the schrader valve on the fuel rail to ensure they are good, and stop the leak. Usually a fuel leak on an engine will dissipate to quickly and you can never find it, so be thankful that you did.

Posted on Apr 06, 2011

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Bad plug or broken wire at the plug, at the alternator. Pull the plug off the alternator. Turn the key on and check for power and ground at the leads. No reading, probe the wires a couple inches back. If a read there fix or replace the plug. If you have a 3 wire plug, best to use an ohm meter. Test each wire separately. At the pin and a couple inches back on the wire. This test may include testing the wire back to the PCM and fuse panel. You'll need wiring schematics for this. The PCM is what fields the alternator to charge and supply power when the engine is running.

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It looks like the OBD 2 connector gets power from the cig lighter fuse in the box near the battery.
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I would check the fuel pump fuse and relay for power - the pump relay gets power from a PCM fuse which could also affect the computer.
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Alternator maybe charging , but not enough to keep the battery charged which is causing the battery to drop charge. Most likely it's the voltage regulator inside the alternator. but regardless the whole alternator will have to be replaced. This will eventually cause the new battery cells to go bad.

Jan 06, 2012 | 2006 GMC Envoy

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I have a 2006 envoy and the light are going dim and the battery volts drop when car is at a stop light. i changed the alternator and they say the battery is good, now i don't know what to do... can you...

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Check your Negative cable attatched to your starter. Next check your charge on your battery, a clicking noise indicates one of 2 things, 1. your battery is dead or dying and needs to be replaced, a battery charge will only solve the problem temporarily, it will continue to die and ruin your alternator. 2. your starter solenoid is going bad, being unable to deliver enough juice to your copper terminals surrounding the magnet that pushes the small gear pinion on to the flywheel and turns the motor to start.

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I have an 06 GMC Envoy and it won't start (sometimes). Other times it will start fine. I think it may be a weak battery. Should I just buy a new battery and try it or should I be concerned about something...

{: ) There are shops that has these gadget to test the battery and charging systems at the same time. As of the time being, you can clean battery terminals for presence of corrosion, to have that clean tight connection to the battery. Check also your engine belt.
If you have a reliable digital multimeter, you can measure the charging voltage at the battery terminals when the engine starts to run. Should be around 13.8 to 14.5 volts depending on the loads that are on.
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no i dont think your alternator is going out but you can test it easily there at home simply by taking the pos battery cable loose while the vehicle is running...if it continues to run it means he alt is good if it dies then you wil need a new alternator.its a sure fire way to know if its good or bad.

Jan 20, 2009 | 2004 GMC Envoy

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