2005 Infiniti FX35 Overheating Issue with P1721 Diagnostic Code Explained
Hello, My 2005 Infiniti FX35 has started overheating specifically while driving, but the engine temperature remains normal when idling, even with the air conditioning on. I've scanned the vehicle and received diagnostic trouble code P1721. What does P172
Have you checked for any additional diagnostic codes? Diagnostic trouble code P1721 is triggered when the Transmission Control Module (TCM) fails to receive the correct vehicle speed sensor signal (from the MTR) via CAN communication from the combination meter (unified meter and A/C amplifier). For overheating issues, standard troubleshooting steps include checking coolant level, thermostat function, coolant flow, water pump operation, and airflow obstruction.