P0453 Evaporative Emissions Control System Pressure Sensor High Input

Description and meaning of DTC p0453

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. The EVAP (Evaporative Emissions) System allows fuel tank vapors to be purgedinto the engine and burnt rather than expelled into the atmosphere as harmfulemissions. The EVAP system contains a pressure sensor to check the integrityof the system. Periodically, the EVAP system performs a pressure test to checkthat there are no leaks in the system. It uses this sensor, also known as a fuel tank pressure (FTP) sensorto check for leaks. Basically P0453 means the PCM (Powertrain Control Module)noticed the EVAP Pressure sensor or FTP is indicating a higher than normal pressure(above 4. 5 Volts) in the EVAP system. NOTE: On some vehicles the FTP is a partof the fuel pump assembly in the tank. Related evaporative emission trouble codes include P0450, P0451, P0452, P0454, P0455, P0456, P0457, P0458, and P0459.

p0453 diagnostic trouble code symptoms

There will likely be no noticeable symptoms along with this code other thanthe MIL (Malfunction Indicator Lamp), commonly known as Check Engine Light illumination. However, there may be noticeable fuel odors in some cases.

DTC p0453 - possible causes

A P0453 DTC trouble code may be caused by one or more of the following:Open on FTP sensor signal wire Short to voltage on FTP sensor signal wireBad FTP sensor Abnormally high pressure in fuel tank due to blockage in EVAP purge hosesor overfilled tank Loose/damaged FTP sensor connector Loss of ground to the sensor

How to fix OBD-II diagnostic trouble code p0453

Using an scan tool access FTP sensor value with Key on Engine off (KOEO). Normalvalue is usually somewhere near 2. 5 Volts at atmospheric pressure (may fluctuatesome due to altitude). It shouldn't ever be above 4. 5 Volts. 1) If it is close to 2. 7V with the gas cap off, the problem is likely intermittent. Using a Digital Volt Ohm Meter, measure the voltage on the signal wire whiletrying to induce the problem by wiggle testing all the wiring at the FTP sensor. If the voltage fluctuates when wiggle testing, check for connector problemsi. e. water in the connector, broken or chafed wiring. 2) If the value shown on the scan tool is above 4. 5V, unplug the sensor (ifpossible) and check for voltage again. If the high voltage is still presentwhen unplugged, inspect wiring harness for a short to voltage on the signalwire. If the high voltage disappears when unplugging the sensor, check for agood ground to the sensor and proper reference voltage. If you have a good groundand 5 Volts reference voltage, replace the FTP sensor since it's likely shortedout. Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0444 - P0445 - P0446 - P0447 - P0448 - P0449 - P0452 - P0455 - P0456

More OBD-II diagnostic trouble codes (DTC)