Emission controls · Powertrain · generic (SAE-defined)
P0453: Evaporative Emission System Pressure Sensor High Input
P0453 means the fuel tank pressure sensor in the evaporative emission (EVAP) system is reporting a signal voltage above its normal range.
Standard title per SAE J2012 / ISO 15031-6 · Updated 2026-11-07 · By CarWhere Research
How P0453 sets
The powertrain control module (PCM) watches the fuel tank pressure sensor signal. If it stays above the maximum valid value for a set time, from an open signal or ground circuit, a short to voltage, or a sensor fault, the PCM sets P0453. Thresholds are manufacturer-specific.
Common causes of P0453
Roughly most likely first; the actual cause depends on the vehicle and needs testing to confirm.
- Failed fuel tank pressure sensor
- Open sensor ground circuit
- Signal wire shorted to voltage
- Blocked vent causing genuinely high tank pressure
- Damaged connector or harness
P0453 symptoms
- Check engine light on
- Possible hissing when removing the fuel cap
- Possible difficulty refueling
- Often no drivability symptoms
How P0453 is diagnosed
- Check for related EVAP or vent codes
- Read tank pressure with the engine off, then remove the fuel cap; a reading that drops sharply suggests real pressure from a blocked vent
- If the reading stays high with the cap off, inspect wiring and the sensor
- Verify sensor ground and reference voltage
- Check the signal circuit for a short to voltage
- Inspect the vent valve, vent hose, and filter for blockage
Typical fixes for P0453
- Replace the fuel tank pressure sensor
- Repair the ground or signal wiring
- Clear or replace a blocked vent valve, hose, or filter
Replace parts only after testing confirms the cause — a code names the circuit or condition that failed a check, not necessarily the faulty part. We don’t publish per-repair prices; for what households actually spend on upkeep, see car repair costs.
Manufacturer notes
Definitions can vary by manufacturer; check factory service information.
Related codes & warning lights
P0453 FAQ
What does code P0453 mean?
P0453 means the fuel tank pressure sensor in the evaporative emission (EVAP) system is reporting a signal voltage above its normal range. The standard definition is "Evaporative Emission System Pressure Sensor High Input."
Can I drive with a P0453 code?
Yes. It should not affect how the engine runs, but the EVAP system cannot be monitored correctly. If you also have trouble refueling, a blocked vent may be involved.
Can a blocked vent cause P0453?
Yes. If the vent path is blocked, real pressure can build in the tank and drive the sensor reading high.
Is P0453 dangerous?
Generally no, but if pressure is truly building in the tank, fuel could spray when the cap is removed, so open it slowly.
Keep researching
More emission controls codes
Sources
- SAE J2012 — Diagnostic Trouble Code Definitions (standard code titles)
- ISO 15031-6 — Road vehicles: communication between vehicle and external equipment for emissions-related diagnostics, Part 6: Diagnostic trouble code definitions
- U.S. EPA — Vehicle Emissions Inspection and Maintenance (I/M) programs
- U.S. EPA, 40 CFR 86.1806-17 — Federal onboard diagnostics requirements for light-duty vehicles
- California Air Resources Board — On-Board Diagnostic (OBD) Program
General information written by CarWhere Research, not a diagnosis of your vehicle. Manufacturers can add their own sub-definitions and test conditions; confirm with the factory service information for your year, make and model. Before paying for a repair, check NHTSA for open recalls and your warranty booklet: federal law requires an emissions warranty on major emission-control parts such as the catalytic converter and engine computer.