1. Overview Error Code: 1901 System: Traction Control / Drive Controller (Often Curtis or ZAPI controllers) Severity: High (Vehicle derating or complete traction cut-off) Common Message on Display: "Traction fault – Contact service" or "1901 Motor controller error"
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1. Overview Error Code: 1901 System: Traction Control / Drive Controller (Often Curtis or ZAPI controllers) Severity: High (Vehicle derating or complete traction cut-off) Common Message on Display: "Traction fault – Contact service" or "1901 Motor controller error"
