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code po463 Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes paulrice User Jan 14, 2010, 3:57 PM Post #1 of 4 (12667 views) code po463 Sign In 2000 chevy 1500 pick up 4.8 108000 miles fuel level circuit sensor high voltage whats that mean Sidom Veteran / Moderator Jan 14, 2010, 4:04 PM Post #2 of 4 (12657 views) Re: code po463 Sign In It means there is a problem in the fuel sending unit circuit. The PCM uses a 5v reference on this system to calculate fuel level. There is either a problem in the sending unit or related wires causing the voltage to be too high for too long. I'm assuming the fuel gauge isn't working......... paulrice User Jan 14, 2010, 4:23 PM Post #3 of 4 (12651 views) Re: code po463 Sign In the gauge is not working right would that send a p300 code also? Sidom Veteran / Moderator Jan 14, 2010, 4:33 PM Post #4 of 4 (12650 views) Re: code po463 Sign In No, a P0300 is a random misfire. I would take a fuel pressure reading and see how long the pressure holds with the key off. You should have around 60 psi KOEO and the pressure shouldn't drop too much too fast. If the pressure is weak & drops too fast, I would start with changing out the fuel pump & connecter. These come as an assembly, pump, sending unit & FTP sensor. While it was out I would verify the 5v ref & grounds. If I remember correctly the fuel gauge ref wire is the small purple wire. The ground wires are black. It's quite possible this may take care of both problems. Just a quick caution to never use a test light on a computer ref voltage line. It's very possible to damage the PCM that way. High impedance voltmeter or lab scope only.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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