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 fuel tank pressure sensor sits on top of the fuel tank. A small port on the sensor is open to the atmosphere and the port is used to reference atmospheric pressure during the EVAP system test. The vehicle conducts an engine off natural vacuum test to detect vapor leaks. GM has determined that water accumulation or condensation can block the port, resulting in inaccurate sensor reporting which then sets the trouble codes. GM cautions NOT to simply replace the fuel tank pressure sensor if the problem is isolated to water accumulation. Instead, GM has designed a shield to protect the port. Installing the shield prevents further false trouble codes.
Vehicles affected by service bulletin #10-06-04-001B
2009-2010 Chevrolet Cobalt, Colorado (Built Prior to January 13, 2010), Silverado (Built Prior to November 4, 2009)
2009-2010 GMC Canyon (Built Prior to January 13, 2010), Sierra (Built Prior to November 4, 2009)
2009-2010 Pontiac G5
Fix P0451, P0454 on Chevrolet Colorado, Silverado and GMC Canyon, Sierra
Raise and support the vehicle. Then support the fuel tank and remove the fuel tank strap bolts and straps. Lower the tank halfway to access the fuel tank pressure sensor. Install the fuel tank pressure sensor shield, Part 20893611.
Fix P0451, P0454 on Chevrolet Cobalt and Pontiac G5
Raise and support the vehicle. Then install the fuel tank pressure sensor cover, Part #20893611.
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