Evaporative Emission Control System Pressure Sensor High Input
What does P0453 mean?
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.
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
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Check FTP sensor voltage on a scan tool -- voltage above 4.5V indicates a high input fault
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Disconnect the FTP sensor and check if voltage drops -- if it stays high, the wiring is shorted to voltage
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Verify the sensor ground wire has continuity to the ECM ground pin
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Check for chafed wiring where the signal wire could contact a 5V or 12V source
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Replace the FTP sensor if wiring and grounds are verified good
Frequently 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.