What is OBD-II PID? On-Board Diagnostics II Parameter IDs, more commonly known as OBD-II PIDs, are a set of specific codes used in vehicles that have an OBD-II system, and allow us to request information from the vehicles systems. Each PID provides access to a specific data point, including vehicle speed, engine RPM, diagnostic trouble codes and numerous other system and operational data points. These OBD-II PIDs are essential for vehicle telematics systems and diagnostic processes, allowing technicians and telematic devices to see, interpret and analyze vehicle performance data and a range of system health information. Types of PID You Might See There are several types of PID that can be categorized based on what they do, or the kind of information they give us. Some PIDs are standardized and used across all vehicles, however there are also manufacturer specific PIDs, and some that may only be found on a specific model of vehicle. Here is everything you need to know about reading and using PIDs: OBD-II Scanner — You use this tool to read PIDs from your vehicles onboard diagnostic system. They vary from handheld, standalone systems to a mobile app and hardware interface, such as the AutoPi device. Data PID or Fault Code — It is important to understand that fault codes and PIDs are very different things. Fault codes tell us of a problem the vehicle has experienced, whereas a PID provides real-time information about what the vehicle is doing at that exact moment, such as how fast it is going. Live Data Reading — PIDs allow data to be read as it is generated, giving real-time monitoring of vehicle parameters. This can be really useful for finding those intermittent faults you sometimes get, as you can diagnose as they occur, rather than working from a fault code later. Why OBD-II PIDs matter in Modern Vehicles — As a standardized way of obtaining data, performing diagnostics and more, they are essential for routine maintenance and troubleshooting the complex systems found in modern vehicles. DIY and OBD-II PIDs — With affordable scanners and apps now available, car owners can read PIDs themselves, allowing for basic troubleshooting and maintenance tasks to be deal with at home. OBD-II PID Examples With a wide range of vehicle data points that you can examine, PIDs provide detailed insight into how a vehicle is operating. Here are three of the most common PIDs you may find useful: Engine RPM — PID: 0x0C provides real-time information about your engine revs, crucial information when assessing engine performance and efficiency. Vehicle Speed — PID: 0x0D provides continual data about the vehicle’s speed, which is used most commonly in telematics installations and in vehicle diagnostics. Throttle Position — PID: 0x11 tells us the position of the throttle in real time, useful for assessing engine load and understanding driver behavior. Each PID provides access to a specific type of data, giving us insight into every system and aspects of the cars operation you can think of. They have become integral into the diagnostics, maintenance and telematics processes that are essential to the ownership experience for modern vehicles. Conclusion If you have any interest in working on your own vehicle or as a mechanic or technician, understanding OBD-II PIDs is essential, with each code giving you detailed insight into your car’s health and performance, so it is easier and faster to maintain and troubleshoot when required.
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