Service bulletin SB_715.1

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

NHTSA's summary

Pierce apparatus equipped with Command Zone multiplexing uses the cab power distribution area for determining the vehicle system voltage. However, because of voltage drop between the batteries and the cab distribution area, this is not a true representation of actual system voltage. To improve the accuracy of the Command Zone voltage gauge reading, a programming update may be performed that will use a Battery box module to determine system voltage, rather than a cab mounted module.

The document

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Listing a model year does not mean every vehicle of it is concerned: the document says which.

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