Jungheinrich uses a specific structure for their codes to help identify where the issue is occurring: First Digit (1) : Refers to the Gear/Travel component area. Second Digit (9) : Refers to or operation-related messages. Sub-index (.1)
You can finish your shift at reduced speed if the motor is not actually hot. But continued operation for days will destroy the drive motor.
On many Jungheinrich models, error 1901 can trigger if the sensor wheel is wobbling or the gap between the sensor and the sensor wheel is too large .
Often, the code is triggered by simply having your foot on the pedal during the power-on sequence. the truck fully. Jungheinrich Error Code 1901
: Drive pedal (accelerator) is pressed or stuck while the truck is starting up.
Check around the floorboard and pedal mechanism for dirt, trash, or obstructions (e.g., a loose wooden pallet piece or packing material).
Verify that the return spring is not broken and successfully pulls the pedal back to zero. Jungheinrich uses a specific structure for their codes
Moisture ingress, excessive vibration, or thermal cycling can damage the internal printed circuit board (PCB) of the traction or steering controller. Capacitors can leak, or logic chips can fail over time, rendering the controller unable to boot its software correctly. 4. Key Switch and Start-Up Logic Interuptions
Once the diagnostic steps isolate the source of the issue, implement the appropriate repair strategy:
The forklift's central control unit runs a self-test when you turn the key switch or enter a PIN. The truck expects the accelerator pedal to be neutral. If the sensor shows the pedal is pressed, the system triggers code 1901 and disables travel functions. This fail-safe prevents the machine from jumping forward or backward upon startup, protecting operators and racks. Primary Causes of Error Code 1901 But continued operation for days will destroy the
While the base code indicates the accelerator pedal was pressed, it can appear with different sub-index numbers, which provide more specific diagnostic information.
Debris, trash, or items on the floorboard are jamming the pedal down.
The Jungheinrich Error Code indicates that the drive pedal was activated during startup