P0453

P0453 is the inverse of P0452 — the fuel-tank pressure sensor is reporting voltage above the expected operating range, typically above about 4.5V on a 5V reference. This means the sensor is reading open internally, the signal wire is shorted to the 5V reference or to a power source, or the ground side of the sensor has opened up. Same diagnostic approach as P0452: multimeter at the connector to verify the 5V reference, ground, and signal pins. A common P0453 pattern is a corroded or backed-out ground pin on the sensor connector — the sensor loses its reference path and the signal pulls high. If the reference and ground are present and clean but the signal still reads stuck high, the sensor's internal element has failed open and it needs replacement. The fuel cap doesn't cause P0453; this is an electrical condition.

Vehicle-specific tendencies: 2012+ Hyundai/Kia FTPS failures can manifest as either P0452 or P0453 depending on which way the sensor element fails — both codes lead to the same sensor replacement on these platforms. 2005-2015 Toyota/Lexus rarely throws P0453, but when it does on older Camry/Corolla it's typically a wiring chafe near the tank from the harness rubbing the frame. 2003-2010 Ford 4.6L P0453 occurrences are often tied to underbody corrosion taking out the ground or signal wire to the FTPS. 2007-2014 GM trucks see P0453 about as often as P0452 — both are wiring-or-sensor faults rather than the platform's dominant EVAP pattern. 2008-2015 VW/Audi don't typically throw P0453 for the same architectural reason they skip P0451/P0452. Repair range: $0-20 connector repair, $80-150 sensor, $200-400 if harness work is involved.