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Curtis Code 99
Dualmotor Parameter Mismatch — controllers 1234 / 1236 / 1238
Possible causes (from the Curtis manual)
Dual Drive fault: see Dual Drive manual.
When it sets / how it clears
119
Effect of the fault
1234/36/38 Manual, OS11
Curtis 1234/1236/1238 controllers are fitted to many electric forklifts and industrial trucks (including models from Chinese brands that use Curtis control). If your display shows code 99 with a Curtis controller, this entry applies; the vehicle maker’s manual may add model-specific notes.
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For controller, contactor, sensor or throttle parts, send us the code (Curtis 99), controller model and vehicle model on WhatsApp — we quote genuine and OEM parts for export.
Ask for the replacement part on WhatsAppSource: Curtis 1234/36/38 Controller Manual, OS 11, Section 8 Diagnostics & Troubleshooting, Table 5. Compiled 2026-10-29. No affiliation with Curtis Instruments.