VW Passat B6 1.9 TDI P0236 Fault: No Power on Startup After Re-Start
I'm facing a persistent issue with my VW Passat B6 1.9 TDI (BKC variant, 168k miles) and would greatly appreciate any insights from experienced users. Every time I start the engine, I experience a complete lack of power—often making it impossible to drive away. This problem usually resolves after driving for about one mile or so, at which point I can safely stop the engine, restart, and the vehicle returns to normal performance with full power and no smoke. The issue only occurs during startup; once the engine is running normally, everything operates smoothly without any visible signs of trouble. The diagnostic code being triggered is P023 or P0236 (Fuel Pressure Regulator Control Circuit Malfunction). I've already replaced both the MAP and MAF sensors, and the turbo actuator appears to be functioning correctly. No air leaks have been detected during inspections. One user suggested a fuel pressure issue, but after restarting, the engine runs fine—indicating that the problem is intermittent. Currently, this fault occurs consistently, requiring multiple restarts to regain full power. I'm at a loss as to what could be causing it and would welcome any technical advice or troubleshooting steps for this specific P0236 issue on the VW Passat B6 1.9 TDI platform.
https://www.obd-codes.com/p0236 - This code typically points to a fuel pressure regulator control circuit fault or an issue with the fuel pressure sensor. On VW Passat B6 1.9 TDI models, it may also be related to wiring harnesses or faulty connections in the fuel system. Check for loose connectors or corrosion near the fuel rail and ensure proper grounding of the fuel pressure regulator module.