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smiley mal

Fault Codes.

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smiley mal

I've been having computer problems with my 04 Response with a 340 Monsoon. Fault Codes come up saying - Code 51 Calibration Checksum Incorrect, Code 81 5 Volt Reference Circuit Out Of Range. Would anyone know what these faults mean?

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electricjohn

That code would appear if you have an internal problem inside your ECM, usually a short circuit or ground fault. It can also show up if external sensors or control devices are shorted or grounding. Since the 81 code also showed up, the fault may be in the 5 volt DC power supply part of the ECM or one of the external devices that are driven by the 5 volt source.

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smiley mal

I spoke to larry at Indmar and he assured me that it's not the ECM even though it's the 3rd one I have replaced. I'm in the process of replacing all the sensors and trying to purchase a new harness. This issue has been ongoing for the last 18 Months now and no one knows what's wrong.... Thanks for the reply....

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