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What is the definition of diagnostic code 12 for 1991 Chevy lumina apv?
Wiki User
∙ 14y ago
Code 12 just means that the ECM is going into diagnostic mode, this is NOT a trouble code! Code 12 should blink a couple of times pause then blink your trouble codes if you have any. If you have no trouble codes, it will resume to blink code 12 again.
Wiki User
∙ 14y ago
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