Question about 1991 Buick Roadmaster
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Posted on Jan 02, 2017
that code has to do with voltage there are four circuits that have to have five volts ( egr , fuel tank, throttle postion sensor, and Map sensor) unfortuatatly you need a scan tool to test for this and it is a 12 step process you could be replacing the egr valve map sensor fuel tank pressure sensor map sensor or throttle postion sensor or the PCM which is the computer. but to know which one you need the scan tool instead of throwing money at it. sometimes also they trip on accident if you get a voltage surge like changing the battery. so if it where me I would take it to your local autoparts store and have them clear the code they have a scan tool and will do it for free if it was a power serge it wont come back if it comes bake you will need the scan tool to find which component is bad.
Posted on Sep 02, 2009
SOURCE: Will not charge
you will get some funny answers from some of these "experts " The symptoms suggest to me with out much doubt that the regulator is not doing its job correctly ,consistently.Iwould take it to an AUTO ELECTRICIAN and get it tested in situ.... there is only 4 things it can be , wireing ---battery---alternator-----regulator and of those the reg. is the only one that chops and changes. it will cost little for a sparky to check the reg ,. AND I WOULD LIKE TO KNOW THE OUTCOME
Posted on Oct 22, 2009
Generally the standard voltage should be 13.5 to 15.5 depending on the load that is being put on the vehicle and age of the battery an older battery may require more voltage to charge. Unless the voltage drops below 13 you are probably ok.
Posted on May 28, 2010
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