(often appearing as 1901.1 ) is a critical but easily identifiable event code in Jungheinrich industrial trucks and forklifts. This fault code specifically indicates that the drive pedal is activated during the startup sequence .
– this will not clear stored codes on Jungheinrich trucks made after 2012. The EEPROM retains faults.
If paired with 1900, your motor may truly be overheating. Jungheinrich Error Code 1901
The technician will have the necessary diagnostic tools (like JUDIT or ETM software) to perform more advanced troubleshooting. This may involve:
Only a dealer or well-equipped technician can perform this step. Connect to the truck’s OBD-style diagnostic port. (often appearing as 1901
Code 1901 indicates a between the traction controller (drive motor inverter) and the main control unit (MCU / vehicle master). The drive unit is not receiving the expected cyclic messages.
1901 System: Traction / Drive Controller (typically CAN bus related) Error Type: Communication fault / Timeout The EEPROM retains faults
Ensure the metal casing of the controller is securely grounded to the forklift chassis.
. This is a safety failsafe designed to prevent the industrial truck from moving abruptly when the key is turned or the system is energized. 📋 Incident Report: Fault Code 1901 1. Error Identification Error Code: 1901 (often displayed as E1901 or 1901.1). System Classification: Operator Error / Startup Interlock. Affected Component: Traction Control System / Drive Pedal.
What is the of your Jungheinrich forklift (e.g., ERE, EFG, EJC)?
| Common Cause | Detailed Explanation | Solution | | :--- | :--- | :--- | | | The sensor, often a Hall effect sensor, may have failed. Internal drift, cold solder joints, or a broken track can cause it to send a continuous signal. | Inspect the pedal sensor and wiring harness. If faulty, the entire pedal assembly may need replacement. | | ⚠️ Mechanical Obstruction | A physical object (e.g., a floor mat, debris, ice in cold storage) might be pressing against the pedal, or the pedal's pivot could be jammed, preventing full return to the 'zero' position. | Remove any obstruction and ensure the pedal moves freely and springs back to its upright position. | | ⚡ Electrical Issues | A broken wire, loose connector, short to ground, or corrosion in the wiring harness can send a stray 'active' voltage to the controller. | Inspect the wiring harness from the pedal to the main controller for any signs of damage, wear, or loose connections. | | 💻 Controller Malfunction | In rarer cases, the analog-to-digital (A/D) converter input on the main controller responsible for reading the pedal signal could be faulty. | Advanced diagnostics with dealer-level software like Jungheinrich's JUDIT-4 are required to test the controller's inputs. |