A P0258 code on your 2020 BMW X5 indicates a low input from the injection pump rotor position sensor circuit. BMW offers both gasoline and diesel X5 variants, making engine identification the first diagnostic step.
2020 X5 Engine Lineup
The 2020 BMW X5 is available with the xDrive40i (3.0L turbo inline-6 gas), xDrive50i (4.4L twin-turbo V8 gas), M50i (4.4L V8), and in some markets, the xDrive30d/40d (3.0L diesel). The diesel models are less common in North America. P0258 directly applies to diesel injection pump systems.
Diesel X5 Diagnosis
If you have a diesel X5, P0258 indicates low voltage or resistance from the pump position sensor. Causes include sensor failure, wiring damage causing a short to ground, or connector corrosion. The sensor helps the DME (engine computer) time injection events precisely. Low signal disrupts this timing.
Gasoline X5 Considerations
BMW's gasoline engines don't use rotary injection pumps with position sensors in the diesel sense. If P0258 appears on a gasoline X5, verify using BMW's ISTA diagnostic system. There may be a database error or similar code with different meaning in BMW's proprietary system.
Repair Approach
For diesel models, test the sensor circuit for shorts to ground and verify sensor output. Sensor replacement requires injection pump access. For gasoline models, verify the code with ISTA and address any actual fuel system symptoms separately. BMW dealers can confirm proper code interpretation for your specific engine.