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


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

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