Cars typically have a 12-volt battery and typically use that voltage to power components like motors and lights, so why don't sensors get the same treatment? This video explains why many sensors use 5 volts instead of 12, and how we ended up with specifically 5 V in the first place.

Many sensors end up operating on a 5 volt output from the ECU/PCM, so this is an important part of the car to understand, especially for diagnosing problems with sensors and electronics.

If you have any other questions about five-volt sensor systems or automotive electricals in general, feel free to ask in the comments!

OBD2 Codes Related to 5V Reference Issues:
• P1295 No 5 Volts at TP sensor (Chrysler, Jeep)
• P1296 No 5 Volts at MAP sensor (Chrysler, Jeep)
• P1403 No 5 Volts at EGR sensor (Chrysler, Jeep)
• P1488 5 Volt Auxiliary Power Output Too Low (Chrysler, Jeep)
• P1496 5 Volt Power Output Too Low (Chrysler, Jeep)
• P1635 5 Volt Reference Circuit (GM)
• P1639 Reference circuit 2 5 volts (GM)
See all codes: https://carssimplified.com/list/obd2-codes.php

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