ECM: The Audi V8 ECM is similar to the PCM but may have a narrower focus on engine-related functions. It monitors and controls various engine parameters to ensure optimal performance and efficiency. Common Issues with ECU, PCM and ECM In conclusion, understanding the functions and troubleshooting common issues with your ECU, PCM, or ECM is essential for maintaining your vehicle's performance. By following the steps outlined in this guide and seeking reliable solutions from Flagship One, I...