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99 cadilac commercial chas ran and died will not restart Computer codes U1255 & P1376. PLZ help

Vehicle: 99 cadilac commercial chas v8 North Star 32 valve

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P1376 Igntion ground circuit

Missing ground what happens is the ground connection for the ICM tends to rot away, re-establish the ground for the ICM

right near the battery this ground tends to rot away.depending on the vin the location may vary.

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