Question about 1999 Chevrolet Malibu

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P0171 and p0463

The codes p0171 and p0463 keep coming up.I have a 2005 chevy malibu and when it hits 4000Rpm it shuts down completely. Also the meter will read full then drop down to empty then back up to full.Where do i start to fix my problem besides the oxygen sensor???Help please

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  • camillegorma Mar 14, 2009

    My first question is for the fuel pump module, Do i have to buy a whole new fuel pump or do they sell the fuel pump module separate? My second question is can you be alittle more specific as to what to do for the p0463 please? How much would you say the module runs for?


  • camillegorma Mar 14, 2009

    Does anyone know where i can get a fuel pump at a good price?

  • camillegorma Mar 15, 2009

    Catalyst System Low Efficiency (Bank 1) (p0420) is what came up after i replaced the whole fuel pump.What do i need to do?



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Replace the fuel pump module (inside the fuel tank) it has 2 level sensors on it. The po463 code is an open condition on the high level sensor, one sensor reports to the ECM, other to your gas gauge on the dash.

Posted on Mar 14, 2009

  • 1 more comment 
  • Bob McGrew Mar 14, 2009

    eaiser to replace the complete unit... last one we did was about $230 for the complete unit. It is more than just a fuel pump. you can see a picture of one at

  • Bob McGrew Mar 14, 2009

    Sorry, its Also check with autozone,,, advanced auto parts,,,,, napa,, they all have them When you see the fuel pump module, you will know why you replace the complete unit. (pump, sensors, internal filter, sump, wiring harness are all part of the unit.

  • Bob McGrew Mar 16, 2009

    Fuel trims were in use due to fuel pump sensors/fuel pump. try 6 or more drive cycles and see if po420 will reset or clear. Drive cycles are ,,,, warm engine,, 2500 rpm,,, 6 minutes. During that time, the ecu will test at about one minute each during the drive cycle.. it may take more cycles to see if 420 will clear out on its own. The cat efficiency was degraded below the calibrated threshold ,,, might be due to the fact that the fuel pump and sensor problem triggered the ecu to change the fuel trim on the injectors. This "fuel trim" is the way that the ecu fine tunes the engine to current conditions over the base fuel injector pulse. Its the ecu learning what is happening to the air/fuel ratio and over serveral cycles it will change the A/F ratio to suit. It may take a few driving cycles for all of this to even or clear out. Hope this helps,,,,,,



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