2002 Dodge Ram Engine code 442 and 455

Tiny
MMCRAE7267
  • MEMBER
  • 2002 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
My engine light is on showing codes 442 and 455. Gas cap is good and I can't find any vacuum leaks. While driving under load the heater works fine. At idle or while coasting down a hill the heater blows cold air and the air will change from the floor to the dash vents. Gas mileage went from 19 mpg to 15 mpg.
Sunday, December 6th, 2009 AT 1:57 PM

1 Reply

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
If its not a vacuum leak check for fuel peak
not all vacuum leaks are easy to locate and you may need a smoke machine help to check for the leak

as for the heat check vacuum supply line for cracks
or if it is unseated
when ever Loss of vacuum occur heater system automatically default to defrost
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Sunday, December 6th, 2009 AT 4:07 PM

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