Question about 1999 Volkswagen Jetta
The voltage regulator on the newer cars are in the pcm(computer) if its bad then the computer will need to be replaced but it sounds to me like it is alright. is the battery dieing out? if not, the alternator and the voltage regulator is working properly
Posted on Aug 26, 2008
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Posted on Jan 02, 2017
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Oct 30, 2015 | Cars & Trucks
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the body control module (BCM) indicating the system voltage.
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
The ignition is on, with the engine off
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