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In rare cases, the analog-to-digital converter inside the traction controller fails, permanently reading outside the 0–5V range.
: Inspect the drive pedal area for any objects (like small stones or thick mats) that might prevent the pedal from returning to its neutral "zero" position. Inspect Wiring Jungheinrich Error Code 1901
Without this accurate temperature data, the controller defaults into (reduced speed) or completely disables the drive motor to prevent thermal damage.
Ensure the operator steps completely away from the floor pedals. This public link is valid for 7 days
| Step | Action | |------|--------| | 1 | – reset the truck. Does error return immediately? | | 2 | Inspect the drive controller connector (usually under the cover near the drive motor). Look for green/white corrosion, bent pins, or moisture. | | 3 | Unplug and reseat the small CAN connector (not the large motor power cables). Listen for a click. | | 4 | Check the main battery connections – loose or dirty terminals can cause CAN voltage dips. | | 5 | If the truck has been pressure washed , suspect water inside a controller or connector. |
(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 . Can’t copy the link right now
If the steps above do not resolve the error, the potentiometer may need to be replaced. If you require further assistance or authorized service, you can reach out to at 0800 357 457 or locate a dealer in North America at Logisnext Americas .
is almost always a temperature sensor circuit problem, not a catastrophic motor failure. By following the diagnostic steps outlined above—starting with resistance checks and harness wiggling—you will resolve 90% of cases without replacing the drive motor.
Look beneath the floorboard mat surrounding the base of the pedal assembly.