Question about Chevrolet Lumina

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I need a explanation of codes P0440 and P0125 and what to look for next on a 1999 chevy lumina with a 3.1 V6. I had a loss of power, would'nt even pull a hill.theses are the codes that were stored.

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  • jeffmiller90 May 08, 2010

    OK,THANKS ONCE AGAIN FOR THE INFO. I APPRECIATE YA.

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P0440 is an EVAP code

conditions for setting this code

  • no TP sensor
  • start-up ECT 40-86 degrees
  • start up IAT not greater than 14 degrees
  • fuel tank is 15-85%
  • BARO greater than 75kPa
  • vehicle driven at least 11 miles
  • EVAP system unable to achine or maintain vacuum during test
for the P0125 = excessive time to enter closed loop

so based on these two codes and your concern I would start looking at the MAF for the IAT being out of specification

in other words the IAT is telling the ECM that the air coming into the engine is a lot colder than actual

Posted on May 08, 2010

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