P0453 2017 GMC Sierra Code - Fuel Tank Pressure Sensor Circuit High Voltage

Code P0453 indicates that the Fuel Tank Pressure Sensor Circuit is reading a voltage higher than expected, which can affect the vehicle's evaporative emissions system.

Symptoms may include an illuminated Check Engine Light, poor fuel efficiency, difficulty refueling, or a noticeable fuel odor around the vehicle.

Common causes include a faulty fuel tank pressure sensor, damaged wiring or connectors in the sensor circuit, or a problem with the EVAP system, such as a clogged vent line.

While the vehicle may remain drivable, it’s recommended to address the issue promptly as it can affect emissions and fuel economy, and may lead to other problems if left unresolved.

Start by checking the fuel tank pressure sensor and its wiring for damage or loose connections. Use a multimeter to test the sensor's output voltage and verify it is within the expected range.

Repairs might include replacing the fuel tank pressure sensor, repairing or replacing damaged wiring, or addressing issues in the EVAP system, such as clearing blockages in vent lines.

The cost can vary but typically ranges from $150 to $400, depending on whether you replace the fuel tank pressure sensor or repair wiring issues.

A loose gas cap is unlikely to cause a P0453 code, as this code specifically relates to high voltage in the fuel tank pressure sensor circuit, not a general EVAP system leak.

Clearing the code will turn off the Check Engine Light temporarily, but it won’t resolve the underlying problem. The code will likely return if the issue isn’t properly diagnosed and repaired.

While rare, a failing Engine Control Module (ECM) could potentially cause incorrect voltage readings in the fuel tank pressure sensor circuit. However, this is usually considered only after other potential causes are ruled out.