Evaporative Emission Control System Pressure Sensor High Input
The P0453 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Pressure Sensor High Input. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $80 - $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
- No noticeable drivability issues
- EVAP system monitor will not run to completion
- Failed emissions inspection
Probable Causes (Ranked by Likelihood)
- Faulty fuel tank pressure sensor reading high voltage Very High
- Short to voltage in FTP sensor signal wire High
- Open ground wire to the FTP sensor Moderate
- ECM internal pull-up resistor fault Low
Step-by-Step Diagnostic Procedure
-
Check FTP sensor voltage on a scan tool -- voltage above 4.5V indicates a high input fault
-
Disconnect the FTP sensor and check if voltage drops -- if it stays high, the wiring is shorted to voltage
-
Verify the sensor ground wire has continuity to the ECM ground pin
-
Check for chafed wiring where the signal wire could contact a 5V or 12V source
-
Replace the FTP sensor if wiring and grounds are verified good
Common Fixes by Vehicle
What techs usually find when diagnosing P0453 on specific vehicles — tap your vehicle for the fix and the exact part:
2004-2016 Ford F-150 5.4L/5.0L Easy DIY
High FTP sensor voltage (above 4.5V) is usually caused by an open circuit in the signal wire or a failed sensor. Check the connector at the sensor for pushed-out pins. If the wiring checks out, replace the FTP sensor (Motorcraft DY-1052). Verify repair with a scan tool watching FTP PID.
Labor: 0.5-1 hour2007-2017 GMC Sierra 5.3L/6.2L Easy DIY
The fuel tank pressure sensor reads high voltage when the connector corrodes from road salt exposure. The connector is under the truck near the fuel tank and prone to splash damage. Clean with CRC QD Electronic Cleaner and seal the connector with weatherproof tape. Replace sensor if readings remain erratic.
Labor: 0.5-1 hour2009-2020 Dodge Ram 1500 5.7L Hemi Moderate DIY
An open circuit in the FTP sensor wiring harness between the tank and the PCM causes P0453. Inspect the harness where it crosses the frame rail -- it rubs through over time. Repair with solder and heat shrink, then re-route the harness away from the frame. Replace the sensor if the wiring is intact.
Labor: 1-2 hoursFrequently Asked Questions
Can I drive with code P0453?
Yes. High FTP sensor input does not affect engine performance. The EVAP monitor cannot run properly, so you will fail an emissions test.
What causes high voltage on the FTP sensor?
A failed sensor with a stuck-high internal element, a signal wire shorted to the 5V reference, or an open ground wire that causes the signal to float high are the most common causes.
Is P0453 the opposite of P0452?
Yes. P0452 indicates low input (below expected range) while P0453 indicates high input (above expected range). Both point to the fuel tank pressure sensor or its circuit.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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