Question about 2003 Pontiac Montana

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My pontiac 2003 montana will start fine,while driven on the road,the car just stops. three minutes later I starts it up and it rides,go a few miles and does it again. Can you tell me what the problem

Thr engine runs good,transmission good. Drives very smooth.

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The engine in this car is controlled by a computer, whenever a problem like this occurs you must have the electronic engine control computer checked for fault codes as the 1st step in diagnosis and repair of the problem.

Posted on Feb 21, 2012

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Hello
Your OBD II scanner doesn't read the BCM (Body Control Module) and likely that is what has the fault codes in it for your present problems. At this point I suggest you get a GM dealer to scan the BCM with the special scanner (called a TECH II) required to do the check and see what shows up.

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by the sounds of it the altanator is putting out enough voltage to keep the car running I my self don't think that it's the alt but the battery, if you don't know the age than it's not a bad idea to replace the battery. if the problem is still there than I would test the alt, should be putting out 14.6 volt at all times. but replace the battery first.

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