2006 Chevy Avalanche code P0452

[Avalanche2006]

My 2006 Chevy Avalanche is having major

Problems. A year ago it started missing. We replaced the plugs, wires, coil packs, all o2 sensors. This year alone I have replaced

The fuel pump, fuel sensor, and oil sending unit. My truck is still idling very hard when started, has no power to move, dies when you give it gas, and smells like it is running rich. We scanned the truck and keep getting the P0452 emissions

Code. Not sure where to go from here.. This truck has been down for over a week and nothing seems to help. Where should we start.. Fuel

Pressure sensor that has already been changed 2 times once with new fuel pump and once on it's own right after, throttle positioning sensors, PCM, or catalytic converters? This truck will start and run but will not drive and I would hate to have it towed for nothing. Any help would be greatly appreciated. The motor is a 5.3l V8.

[tbarn]

P0452 is an evap system code. The problem could be the fuel tank pressure sensor, wiring , pcm or maybe engine vacuum in the tank. While it's running, remove the gas cap and see if you hear a pressure/ vac release sound. If so try removing the purge line from the purge valve, unplug the elec connector. Put a finger over the purge valve nipple and check for vacuum. There should be none.

[Avalanche2006]

Will this emissions problem cause the truck have a rough idle and die when you put it in drive? Most of the time it will die when you put it in drive but last night we got it to stay running and back up a little but it died as soon as it was on the incline.

[Duelin]

2006 Chevrolet Avalanche V8 5.3

P0452

Fuel Tank Pressure Sensor Circuit Low Voltage
The ECM detects the FTP sensor signal voltage is less than 0.13 volts for more than 4 seconds

Probable Cause

Open or short circuit condition
Poor electrical connection
FTP sensor
ECM

 

You are going to have to get a wiring diagram and trouble shoot.