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Posts Tagged: P0454

P0451, P0454 Check Engine Light

Diagnose and fix P0451, P0454 Check Engine Light GM vehicles GM has issued a service bulletin #10-06-04-001B to address trouble codes P0451, P0454 and an intermittent check engine light on the vehicles listed below. The trouble codes P0451 and P0454 are defined as: P0451 Fuel Tank Pressure Sensor Performance P0454 Fuel Tank Pressure Sensor Circuit Intermittent The fuel tank pressure sensor is part of the vehicle’s EVAPORATIVE emission system and is used to detect vapor leaks in the fuel system. For more information on EVAP systems, see this post. The … Read More

Evaporative Emissions System Primer

How does an evaporative emissions system work? The Evaporative Emissions System is responsible for preventing fuel vapors from polluting our air. If you came to this post because your vehicle won’t fill with gas, skip to the bottom of the post In the old days gas tank caps were vented to the atmosphere. That allowed outside air to enter the tank as you used up the gas inside the tank. On warm days the gas expanded and gas fumes vented backwards through the vented cap to the atmosphere. In other … Read More

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