Jungheinrich Error Code 1901 !!top!! Jun 2026

The zip ties had been pulled too tight during a previous repair. Over months of vibration, the tight plastic had bitten into the insulation of the CAN High wire. It wasn't a clean break—it was an intermittent short against the chassis ground. Every time the steering wheel turned to a specific angle, the wire grounded out, silencing the data signal.

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This article provides a complete guide to understanding what Error Code 1901 means, why it appears, and the step-by-step process to resolve it quickly and safely. Jungheinrich Error Code 1901

drive pedal was activated during the truck's startup sequence

: Damaged or loose wiring between the pedal and the traction controller can trigger false startup signals. The zip ties had been pulled too tight

The spring that pulls the pedal back up has weakened, leaving the pedal slightly depressed.

Ray leaned in. The LCD display was glowing with an amber warning triangle. Underneath, the text was stark and unforgiving: Every time the steering wheel turned to a

If your unit uses a potentiometer, it may have drifted out of the zero-travel calibration. A certified technician will need to use the Jungheinrich Diagnostics Tool to verify the sensor's voltage values.

Disconnect the main logic harness from the controller and inspect the pins for corrosion, bent metal, or moisture entry.

Does the code disappear if you on the pedal?

Inspect the Tiller Wiring HarnessThe most frequent culprit for error 1901 is a pinched or frayed wire. Because the tiller arm is constantly moved up and down during operation, the wiring harness inside the hinge point is subject to significant mechanical stress. Remove the plastic covers around the tiller base and inspect the wires for any signs of copper exposure, kinking, or complete breaks. Pay close attention to the area where the wires transition from the arm into the main body of the truck.