What Does P0453 Mean?
The fuel tank pressure sensor is reporting a voltage higher than the PCM expects. This high input condition typically indicates an open ground circuit, a signal wire shorted to the reference voltage, or a failed sensor. The PCM cannot monitor EVAP system integrity, and the check engine light will illuminate. No drivability symptoms are typically present.
Common Causes
30%
Open ground wire in the fuel tank pressure sensor circuit
30%
Failed fuel tank pressure sensor with open internal element
20%
Signal wire shorted to 5V reference wire in the harness
15%
Corroded or disconnected connector at the FTP sensor
5%
PCM ground or input circuit failure
Diagnostic Steps
1
Check the FTP sensor voltage on live data. A high input code means the signal is typically above 4.5-4.9V.
2
Disconnect the FTP sensor connector. If voltage drops to a mid-range value, the sensor is open internally and needs replacement.
3
If voltage remains high with the sensor disconnected, check the ground wire for continuity from the harness connector back to the PCM ground pin. Should be under 2 ohms.
4
Check for a short between the signal wire and the 5V reference wire by measuring resistance between them at the harness connector (both ends disconnected). Should read OL.
5
Inspect the connector at the fuel tank for corrosion, backed-out pins, or damage from exposure to road conditions. The FTP sensor location near the tank makes it susceptible to environmental damage.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The fuel tank pressure sensor is reporting a voltage higher than the PCM expects. This high input condition typically indicates an open ground circuit, a signal wire shorted to the reference voltage, or a failed sensor. The PCM cannot monitor EVAP system integrity, and the check engine light will il...
The most common cause of P0453 (Evaporative Emission Control System Pressure Sensor High Input) is: Open ground wire in the fuel tank pressure sensor circuit
Typical repair costs for P0453 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. This is an emissions monitoring code with no effect on vehicle drivability or safety. Repair at your convenience for emissions compliance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0453 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
EVAP / Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
