2004 Jetta TDI P0726 Fault: Engine Won't Start with Glow Plug Flash and Check Engine Light
My 2004 Jetta TDI experiences a recurring issue where it turns over but fails to start, accompanied by a flashing glow plug light during cranking. After the attempt, the check engine light activates. I've scanned the OBD-II system and retrieved fault code P0726, which is typically associated with transmission-related issues—specifically, an over-rev condition in the transmission. However, I have not experienced any instances of engine over-revving. Given that this code appears without corresponding driving behavior, I'm concerned it may point to a transmission sensor or control module issue rather than engine performance. Any insights on diagnosing P0726 in a 2004 Jetta TDI would be greatly appreciated.
P0726 is not related to engine over-revving; it's typically a transmission diagnostic trouble code (DTC) indicating an issue with the transmission speed sensor or control module. In a 2004 Jetta TDI, this could point to faulty sensor readings or communication problems between the transmission and ECU.