BMW fault code 6540

Hybrid pressure-tank electronics

Hybrid pressure refuelling electronic control unit (TFE): Abrupt pressure drop

Module version: Hybrid pressure-tank electronics (TFE1)

In: X6 (E72) 2009–2011

Reading and clearing it

Fault code 6540 is a BMW code, stored in the car's hybrid pressure-tank electronics, not a generic OBD2 code (P0xxx): a generic OBD2 reader only reaches the engine's emissions faults, so it won't show it. AutoLingo for BMW reads it with BMW's own diagnostic protocols, in plain English, with the details the module stored about it, and clears it after a repair. If a fault comes right back after it's cleared, the problem is still there.

The hybrid pressure-tank electronics is on: X5 (E70), X6 (E71), X6 (E72)

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