A P0453 code on your 2019 Chrysler 300 indicates a high voltage condition in the fuel tank pressure sensor circuit. The sensor is outputting higher voltage than the expected maximum, suggesting an electrical issue.
High Voltage Interpretation
High sensor voltage typically indicates an open circuit condition. When the signal wire is broken or disconnected, the PCM sees the full reference voltage without the sensor's normal voltage-dividing effect. This reads as abnormally high output.
Chrysler 300 Configuration
The 2019 Chrysler 300 offers the 3.6L Pentastar V6 and 5.7L HEMI V8. The fuel tank pressure sensor monitors the EVAP system, providing data essential for emissions compliance and leak detection. A faulty sensor prevents accurate system monitoring.
Causes of High Circuit Readings
An open or disconnected signal wire causes maximum voltage reading. The sensor may have failed with high internal resistance. Corroded connector terminals create intermittent opens. A broken wire in the harness prevents signal return. The sensor itself may be disconnected.
Diagnostic Process
Use wiTECH to monitor sensor voltage. A stuck-high reading regardless of conditions indicates an open. Disconnect the sensor—the reading should remain high (confirming normal PCM behavior with open circuit). Test signal wire continuity from sensor to PCM. Inspect connector for damage or poor contact.