P0454

P0454 is the intermittent version of the FTPS circuit faults — the ECU saw a momentary out-of-range condition, then the sensor came back to a plausible reading, but it logged the intermittent event. This is the hardest of the FTPS codes to chase because by the time the vehicle is on a lift, the fault may not be present. The diagnostic move is to monitor FTPS live data while gently wiggling the connector and harness at the tank, watching for the signal to dropout or spike. If the wiggle test reproduces the fault, the connector or wiring is the cause and the fix is connector cleanup, pin tension restoration, or harness repair. If the wiggle test produces nothing, the sensor itself is likely intermittent internally and the only reliable fix is replacement. The fuel cap is not the cause of P0454. Some shops will pre-emptively replace the FTPS on P0454 alone because the labor to drop the tank twice for a sensor that's clearly going bad isn't worth the diagnostic ambiguity.

By platform: 2012+ Hyundai/Kia FTPS units fail intermittently before they fail outright, so P0454 is often the first code the customer sees before P0451/P0452/P0453 follows weeks later — many shops on these platforms will recommend replacement on the first P0454. 2005-2015 Toyota/Lexus P0454 is almost always a connector issue at the tank — pull, clean, dielectric grease, retest. 2003-2010 Ford 4.6L P0454 is typically harness chafe along the underbody where the EVAP wiring runs near the frame rail. 2007-2014 GM trucks see P0454 from connector water intrusion when the tank-side connector seal degrades. 2008-2015 VW/Audi don't typically throw P0454 (LDP architecture). Repair range: $0-20 connector work, $80-150 sensor preemptive replacement, $200-400 with harness involvement.