02 gmc sonoma died, any suggestions

Asked by Jan 31, 2015 at 06:26 PM about the 2002 GMC Sonoma SL 2WD

Question type: Maintenance & Repair

the check engine light was on for a while then one day the engine just quit. After a few minutes it started back up, long enough to get a couple of blocks home then it died again. It has been starting since, I bought a code reader and got a code of po420.

1 Answer

72,405

Code P0420 is for the catalytic converter. The computer has detected that it's not working as efficiently as it should. I suspect that it's clogged or the honeycomb inside has melted and now the exhaust system is restricted. The excessive back pressure in the exhaust system is what's causing the truck to die. If the truck has been misfiring (flashing check engine light) the converter has been ruined by the misfiring. If it hasn't been misfiring the converter is probably just worn out. Either way I suspect that's your problem. A clogged converter. HTH. -Jim

Your Answer

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    710
  • #2
    Mike Bonnell
    Reputation
    480
  • #3
    James Mayfield
    Reputation
    320
View All

Related Models For Sale

Used Chevrolet S-10
11 Great Deals out of 1,224 listings starting at $1,550
Used Ford Ranger
197 Great Deals out of 5,540 listings starting at $999
Used GMC Sierra 1500
1,219 Great Deals out of 64,512 listings starting at $999
Used Chevrolet Silverado 1500
2,659 Great Deals out of 173,973 listings starting at $955
Used Ford F-150
3,227 Great Deals out of 220,482 listings starting at $1,200
Used Toyota Tacoma
706 Great Deals out of 45,304 listings starting at $1,000
Used Nissan Frontier
491 Great Deals out of 23,905 listings starting at $1,500
Used Dodge Dakota
89 Great Deals out of 3,619 listings starting at $1,295
Used Dodge Ram 1500
443 Great Deals out of 11,139 listings starting at $2,000
Used Toyota Tundra
697 Great Deals out of 34,238 listings starting at $1,500
Used Ford Explorer Sport Trac
57 Great Deals out of 1,816 listings starting at $2,997

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.