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Code 12 is always the first code on a GM. Check for a blown ignition fuse. Otherwise, remove all plug wires from the coils. Turn the engine over. You should have blue spark across the coil terminals. If there is no spark from any of them, replace the ignition module.

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โˆ™ 2006-03-28 18:27:48
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Q: Why might there be no spark coming out of spark plug wires if the computer reads code 12 on 89 3.8 engine and your replaced the coil assembly?
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