If the physical pedal is neutral but the code stays, check the sensor electronics using a multimeter or a diagnostic tool like Jungheinrich JET (Judit):
If you have performed all steps and code 1901 persists, contact a certified Jungheinrich technician – the traction controller may be faulty and requires dealer-level programming.
The potentiometer or Hall effect sensor that measures pedal position is out of alignment, causing it to send a "pressed" signal even when it is not.
: The truck's controller has detected that the accelerator (drive pedal) is not in its neutral position while the key switch is being turned or the system is booting up. Safety Function
Check around the floorboard area for debris, wooden pallets, plastic wrap, or tools that may be wedging the pedal down. 3. Check the Pedal Return Spring Jungheinrich Error Code 1901
| Code | Meaning | Recommended Action | | :--- | :--- | :--- | | | No travel direction selected when accelerator pedal applied. | Before pressing the accelerator, ensure you have selected Forward or Reverse with the travel switch. | | 1908 | Seat switch not closed; truck operational but driver's seat not occupied. | The forklift may operate but at a reduced speed. Ensure you are properly seated so the switch is activated. The truck will not move if you are not in the seat. | | 1909 | Accelerator pressed while parking brake applied. | Release the parking brake before pressing the accelerator pedal. | | 1917 | Accelerator pedal and brake pedal pressed simultaneously. | Avoid pressing both pedals at the same time. Use only the appropriate pedal for your intended action. | | 2951 | Hydraulic function applied during power-up. | At startup, ensure no hydraulic levers (e.g., lift/lower/tilt controls) are being activated. |
: Short circuits, open lines, or corroded pins between the travel setpoint device and the main computer controller. Step-by-Step Troubleshooting Checklist 1. Clear the Operator Interface
Dirt, debris, or a mechanical issue is preventing the accelerator pedal from returning fully to its "zero" or neutral position.
Clear away dirt, ice, pallet splinters, or wrap strings blockading the pivot arm. If the physical pedal is neutral but the
The pedal linkage, spring, or return mechanism is worn, damaged, or dirty, preventing the pedal from returning to the absolute "neutral" position.
If you can tell me the (e.g., EFG, EJE), I can help you find a more specific guide for your equipment. Share public link
: Debris or floor mats are physically jamming the pedal in a depressed position. Electrical Fault
Diagnostic checklist — step-by-step (work from low-risk to higher-risk checks) Safety Function Check around the floorboard area for
: The potentiometer or Hall effect sensor inside the pedal assembly sending an incorrect baseline voltage signal to the controller.
Check under and around the drive pedal for debris (shrink wrap, wood chips, dirt) that might be preventing it from returning to its full "zero" position.
indicates that the drive pedal was activated during the forklift's startup sequence . This is a built-in safety feature designed to prevent the industrial truck from moving unexpectedly when the key switch or power button is turned on. When the electronic control unit detects a voltage signal from the accelerator pedal sensor before the diagnostic self-test completes, it triggers fault code 1901.1 and immediately inhibits travel to protect the operator and nearby warehouse personnel.