Evaporative Emission Control System Pressure Sensor Intermittent
The P0454 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Pressure Sensor Intermittent. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $50 - $300 (parts and labor)
A cracked or loose gas cap causes 60%+ of EVAP codes. This $8 replacement clears P0442, P0455, and P0457 more often than any other repair.
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If a new gas cap does not clear it, the leak is somewhere in the EVAP plumbing. A smoke machine finds the exact leak -- a cracked hose, bad seal, or stuck vent valve -- in minutes instead of guessing at parts.
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Clear the code after the repair. If the light stays off after 50 miles, you just saved $200+ in shop fees.
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Common Symptoms
- Check Engine Light illuminated intermittently
- Code may clear and return on its own
- No drivability symptoms
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Loose or corroded FTP sensor connector Very High
- Intermittent break in FTP sensor wiring High
- Failing fuel tank pressure sensor with intermittent internal fault Moderate
- Poor ECM connector pin contact Low
Step-by-Step Diagnostic Procedure
-
Inspect the FTP sensor connector for loose fit, corrosion, or spread terminals
-
Wiggle the wiring harness at the sensor and along its route while monitoring live data for signal dropouts
-
Check for broken wire strands inside the insulation by gently flexing the harness
-
Clean connector terminals with electrical contact cleaner and apply dielectric grease
-
If the intermittent fault persists after wiring repairs, replace the FTP sensor
Common Fixes by Vehicle
What techs usually find when diagnosing P0454 on specific vehicles — tap your vehicle for the fix and the exact part:
2007-2020 Chevrolet Silverado/GMC Sierra 4.8L/5.3L/6.2L moderate DIY
P0454 indicates an intermittent signal from the fuel tank pressure (FTP) sensor. On GM trucks, this is often caused by a loose or corroded connector at the fuel tank. Drop the tank skid plate and check the FTP sensor connector. Wiggle-test the connector while monitoring live data. If the reading drops out, clean and tighten or replace the connector. If the sensor is faulty, replace with ACDelco 13502903.
Labor: 1-2 hours2004-2018 Ford F-150/Expedition 5.4L/3.5L EcoBoost moderate DIY
Intermittent FTP sensor readings on Ford trucks are commonly caused by cracked solder joints inside the sensor or a corroded connector. Before replacing the sensor, check that the fuel tank straps are tight -- a loose tank can stress the wiring. Replace the FTP sensor with Motorcraft DY-1350 and use dielectric grease on the connector.
Labor: 1-2 hours2010-2020 Chevrolet Equinox/Traverse 2.4L/3.6L moderate DIY
On GM crossovers, the FTP sensor wiring harness can be pinched where it routes through the body near the rear seat. Check for intermittent contact by monitoring the FTP PID on a scan tool while tapping the connector and wiggling the harness. Repair any damaged wiring with weatherproof solder connections.
Labor: 45 min - 1.5 hoursFrequently Asked Questions
Can I drive with code P0454?
Yes. This intermittent pressure sensor code does not affect how the vehicle drives. It indicates a connection issue that comes and goes, so it may clear on its own but will return.
Why does P0454 come and go?
The intermittent nature usually points to a loose connector or a wire with a partial break. Temperature changes, vibration, and road conditions can cause the connection to make and break contact.
Should I replace the sensor or fix the wiring?
Always inspect wiring and connectors first. Replacing the sensor will not fix a wiring problem. Clean and reseat connectors, repair any damaged wires, and only replace the sensor if the fault persists.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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