What Does P0454 Mean?
The fuel tank pressure sensor signal is behaving intermittently, with unexplained voltage spikes, dropouts, or fluctuations that don't correspond to actual tank pressure changes. This is typically caused by a loose connection or degrading wiring near the fuel tank. The check engine light will be on, and the EVAP system monitor will not complete.
Common Causes
35%
Loose or intermittent electrical connection at the FTP sensor connector (vibration-related)
25%
Intermittently failing fuel tank pressure sensor
20%
Chafed or cracked wiring near the fuel tank causing intermittent contact
15%
Corroded terminals causing intermittent high-resistance connection
5%
Loose or corroded ground connection
Diagnostic Steps
1
Monitor FTP sensor voltage on live data while wiggling the sensor connector and wiring harness. Signal dropouts or spikes during manipulation confirm an intermittent connection.
2
Inspect the FTP sensor connector for moisture, corrosion, spread terminals, or a broken locking tab. The under-vehicle location makes this connector susceptible to road splash and debris.
3
Check the wiring harness from the sensor to the main body harness for chafing against the fuel tank, tank straps, or frame rails. Repair any damaged insulation.
4
Record FTP sensor data during a road test over bumps and rough surfaces. Intermittent faults often appear during vibration that can't be replicated at idle.
5
If the connector and wiring test clean, replace the FTP sensor as internal intermittent failures cannot always be detected with static testing.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
The fuel tank pressure sensor signal is behaving intermittently, with unexplained voltage spikes, dropouts, or fluctuations that don't correspond to actual tank pressure changes. This is typically caused by a loose connection or degrading wiring near the fuel tank. The check engine light will be on,...
The most common cause of P0454 (Evaporative Emission Control System Pressure Sensor Intermittent) is: Loose or intermittent electrical connection at the FTP sensor connector (vibration-related)
Typical repair costs for P0454 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. An intermittent FTP sensor signal is an emissions monitoring issue only and has no impact on drivability or vehicle safety.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0454 to identify the root cause.
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Quick Info
Category
Powertrain
System
EVAP / Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
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