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When car batteries start to go south. It will do strange things to the ECU. Most ECU's will shut down at 10.5 volts to protect themselves. They don't like voltage
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09-13-2020, 03:25 PM
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Ronin Samurai - Assassin
 
Join Date: Dec 2011
Location: Fayettenam,Pennsyltucky
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When car batteries start to go south. It will do strange things to the ECU. Most ECU's will shut down at 10.5 volts to protect themselves. They don't like voltage spikes either. When starting with a bad battery. You will get low voltage followed by a voltage spike after starting. The most sensitive part of the ECU will react to the voltage spike. In OP's case. It was the oil temp gauge. Hard to figure out at times.
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