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What does a p0351 trouble code mean in 2003 Chevy silverado?

A P0351 trouble code in a 2003 Chevy Silverado indicates a problem with the ignition coil for cylinder 1. This means the Powertrain Control Module (PCM) has detected a malfunction in the ignition coil that fires the spark plug in the number 1 cylinder. The coil might be failing, have a bad connection, or there could be a problem with the wiring to the coil.