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Curtis Code 49
Parameter Change Fault — controllers 1234 / 1236 / 1238

Possible causes (from the Curtis manual)

1. This is a safety fault caused by a change in certain parameter settings so that the vehicle will not operate until KSI is cycled. For example, if a user changes the Throttle Type this fault will appear and require cycling KSI before the vehicle can operate. 1. These faults can be defined by the OEM and are implemented in the application-specific VCL code. See OEM documentation.

When it sets / how it clears

Set: Adjustment of a parameter setting that requires cycling of KSI. Clear: Cycle KSI. Set: See OEM documentation. Clear: See OEM documentation. Curtis 1234/36/38 Manual, OS11

Effect of the fault

ShutdownMotor; ShutdownMainContactor; ShutdownEMBrake; ShutdownThrottle; FullBrake; ShutdownPump. OEM Faults (See OEM documentation.)

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 49 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 49), controller model and vehicle model on WhatsApp — we quote genuine and OEM parts for export.

Source: Curtis 1234/36/38 Controller Manual, OS 11, Section 8 Diagnostics & Troubleshooting, Table 5. Compiled 2026-10-29. No affiliation with Curtis Instruments.