Question about 2000 Jeep Grand Cherokee

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Check engine light is on

My check engine light is on and the code i get is po128 can anyone tell me what it is

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This code sets when the engine temp doesnt get to operating temp in a desired time. sounds like a thermostat problem. also there are some aftermarket HP parts that will set this code

Posted on Sep 12, 2008

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This is a coolant below threshhold code meaning engine is running too cool. change your thermostat and will fix problem. if you cant clear code after a few drive cycles the computer will cut light off once it sees problem is corrected

Posted on Sep 12, 2008

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hi 128 is coolant temp below regulating temp 405 is










hi 128 is coolant temp is below regulting temp 405 is































































































































hi 128 is coolant is below regulating temp 405 is<erg/swsr/ckt low> hope this helps please rate this answer












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