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Help!! Truck won't pass SMOG

Bloom99cummins
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Bloom99cummins

Bloom99cummins

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I went to smog my truck in CA and when the tech plugged in to the OBD2 his computer could not communicate with my truck. He asked if i had a tuner or something on the truck. After 3 shops all unable to read the OBD2 i am left scratching my head. Would flashing ECM or PCM help? Need to pass ASAP!

The truck has never been tuned. but did have the ECM reflashed in 2019 by Auto computer specialists

 

truck runs great. no codes. Any help would be great. 

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