I think you need to spend a bit of time to see what you are asking, your voltages are way low. Here is some information that will help you change your requirements that will meet your target. You will find automotive is one of the worst electrical environments to work with. Extreme temperatures, location dependent, reverse polarity, and transient voltages which have changed over the years just to note a few.
Valuable Resources for Automotive Electronics:
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STMicroelectronics Application Note AN2689:
This application note provides guidelines on protecting automotive electronics from electrical hazards, focusing on design and component selection. Reading this will greatly enhance your understanding of automotive circuit protection.
Read AN2689 -
Analog Devices: Automotive Electronics Design:
This article distills key insights into designing automotive electronics, offering practical advice for engineers.
Read the article -
Diodes Incorporated: Transient Voltage Suppression in Automotive:
Learn about techniques to protect automotive circuits from transient voltage, which is critical for ensuring reliable operation in harsh conditions.
Read the article -
AEC-100 Standards Webinar:
This webinar from Monolithic Power Systems provides a detailed overview of AEC standards, essential for understanding automotive electronics requirements.
Watch the webinar -
Understanding Automotive Electronics, An Engineering Perspective by William B. Ribbens:
This comprehensive book offers an in-depth look into automotive electronics from an engineering perspective, making it an invaluable resource.
Access the book -
Check this for OBD https://vehiclefreak.com/iso9141-code-meaning-how-to-fix/ OBD negotation initialization procedure https://cdn.standards.iteh.ai/samples/16738/20ff360c25c6462b811ebc0c9256eee0/ISO-9141-2-1994.pdf Then there is https://github.com/muki01/OBD2_K-line_Reader PID codes: OBD-II PIDs - Wikipedia
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Load Dump and Cranking Protection for Automotiv Backlight LED Power Suppl https://www.ti.com/lit/an/snva681a/snva681a.pd
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Quality requirements:
http://www.aecouncil.com/AECDocuments.html
These resources should provide a strong foundation for anyone involved in automotive electronics design. If you need further help or more resources, feel free to ask!
https://forum.arduino.cc/t/struggling-with-k-line-iso-9141-2-communication/1307351/9