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International Automotive Technicians Network
Re: When did GM begin supporting the misfire DTC group
Posted to Technical Discussion Forum on 12/26/2023 27 Replies

that's a continuous test . it ALWAYS says that .

that means the pcm is active for that , it DOESN'T MEAN THERE'S A MISFIRE .

PRETTY MUCH every car says that .

it's been there since obd 2 was installed . Login to read more.

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