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Battery Voltage Low
The DC control battery voltage has dropped below the minimum operating threshold. Low battery voltage can prevent reliable engine starting and may cause controller malfunction.
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For 24V systems, batteries should maintain 25-28V float charge. For 12V systems, 13-14V. During cranking, voltage should not drop below 18V (24V system) or 9V (12V system).
Lead-acid starting batteries typically last 3-5 years. Perform annual load testing and replace when capacity drops below 80% of rated. AGM batteries may last longer.
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A fault code names a symptom, not a cause. Our engineers have written the diagnostic sequence they use on site for this class of fault — ranked causes, ordered steps with the reading expected at each one, and the point at which to stop and call someone.
8 diagnostic steps · intermediate · technician
8 diagnostic steps · intermediate · technician