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Old 02-29-2012, 04:10 AM   #1
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Thumbs down General electrical Question on battery effect on PCM

Is it possible for a weak battery to cause PCM Problems? I keep getting intermittent OBD readings of 1635 on my Buick Park Avenue. The car will run great for a week and then throw the code and stall out. All tests show everything related, PCM & MAP sensors, are OK. Even replaced the sensors. Took it into the shop and they couldn't find anything. the 72 month Battery is in it'* 68th month and a check on it showed 9.5 volts. Here in Hawaii there isn't the extreme cold problems that can kill a battery but it is weak.
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Old 02-29-2012, 07:32 AM   #2
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9.5 volts with the engine off indicates your battery is not holding a charge, which can have an effect on the PCM. The PCM takes the 12 volts and converts it to 5 volts for those sensors. Measure the battery voltage when the car is running.

Also, check your battery cables. They might be corroded to the point of lowering system voltage.
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Old 02-29-2012, 08:18 AM   #3
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cold effects battery capacity not life heat actually wears out batteries faster.
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Old 02-29-2012, 10:24 AM   #4
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I am surprised that your car will start with a battery at 9.5 volts. The battery has a dead cell and should be replaced now. It could mess up many things in your cars electronics.
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