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Old 02-13-2016, 12:28 AM   #1
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Default Multiple fuel codes.

Im new to this so here goes. I have a 2008 gmc yukon. Recently my fuel gauge stopped working. Replaced the whole pump since has 150000 miles on it. Ran fine for a week however fuel gauge still did not work. Now upon heavy acceleration mainly on interstateit jerks really hard. Service engine soon light on so i read the codes and it is throwing codes po463,po230,po449,po461. I have looked all these codes up all are fuel related. New pump so my question is what could cause them all to come on simultaneously. Pleas help! Thanks.
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Old 02-13-2016, 10:34 AM   #2
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P0449 is an evap code, not related to the fuel pump.....that is a whole separate problem involving the vent solenoid....

Were the fuel related codes present BEFORE REPLACING THE PUMP?

Two codes are for the level sender.....the other is for the fuel pump relay circuit....

When you replaced the pump, it came with a new sender? Did you check the connections from the sender to the terminals outside the pump( I believe they should read 40 ohms at E to 240 ohms at F, the older systems went 0-80 ohms)....you can go to a place like Radio Shack, and pick up a 40 ohm, 140 ohm, and 240 ohm resistors, and attach them, one at a time to the harness outside the fuel tank(fuel level circuit)....then turn key on, and see if you get E, 1/2, and F readings on the gage....if you do the problem is in the harness to the tank, or the sender circuit in the tank....if you don't, then it'* a cluster, wiring, or VCM/PCM problem....

If the sender was new on the pump, check your connections at the harness connector, for corrosion or loose connector....

The 0230 code has to do with the primary circuit from the VCM/PCM to the relay, and usually results in a no start.....but your vehicle is starting....
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Old 02-14-2016, 12:29 PM   #3
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Hi. Thanks for your feedback. Its greatly appreciated! The only two codes before i replaced pump where the po461 and po463(fuel level sensor). I reset them numerous times and after i would gauge would go to its level for about 10 seconds then to empty, codes triggeres, and service engine soon light on. I put in a delphi fuel pump with new sensor included on pump. Harnesses seemed clean and fine. Went back together nice and smooth. Started my vehicle and same thing same codes. Ran fine. Only difference is gauge wouldnt go to level but stay on E when reset codes but same codes. Drove it about 500 miles like that. Ran fine. The other day it started jerking bad and numerous times especially on interstate trying to pass or going up a steep incline. Checked codes and was throwing all the ones id listed in my first post. Reset it same thing. Starts and idles fine. Runs fine accelerating in park but when driving anytime rpms gets to 2500 and above it jerks. I am starting to lean towards pcm also. I orginally thought i got a messed up pump but unlikely with other codes not related. Your feedback would be greatly appreciated. Thanks!!
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Old 02-20-2016, 10:01 AM   #4
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Im lost on what my next step is. If anyone has an expertise in this problem please help. I would greatly appreciate it. Thanks!!
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Old 02-21-2016, 01:34 PM   #5
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If you are reading empty, shut vehicle off, disconnect the harness to the tank, and turn the key to "on", don't start.....the gage should go to full.....if it does, the problem is in the connector, the harness, or something is shorting out inside the tank.....

If it stays on empty when the harness is disconnected, then you really have some diagnosing to do......... VEM, Cluster, short in the wiring, etc.
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