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I am having issues with 2 codes, p0381 & p0650. These 2 codes are not always constant meaning that sometimes they will light up in the dash, but most times not. Sounds like a bad ground, but I'm not sure. All of the fuses under the hood test good... Any thoughts?

Vehicle: 2007.5- Chevrolet Silverado 2500HD 6.6L Duramax

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P0381 Wait to start lamp circuit

P0650 Mal function indicator lamp (MIL) lamp

These 2 codes the ECM commands the light on. and detects the actual state does not match .  The ECM knows that the light did not come on. either the light buld itself or the IPC (instrument panel control) .

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