Occasionally, software bugs or glitches within the machine's control system can cause error codes to appear.
Problems with the hydraulic fluid level, contamination of the hydraulic fluid, or malfunctioning hydraulic components can trigger this error code.
The pedal linkage, spring, or return mechanism is worn, damaged, or dirty, preventing the pedal from returning to the absolute "neutral" position.
If you want, I can produce a step-by-step checklist tailored to a specific Jungheinrich model — tell me the model/serial and whether you have the diagnostic tool.
If you have completed both Step 1 and Step 2 and the 1901 error code continues to appear, it is time to contact a qualified service technician. Jungheinrich Error Code 1901
Operator resting their foot on the pedal before turning the key. 🔍 Detailed Causes of Error Code 1901
Wait 5 to 10 minutes to allow the internal controller capacitors to discharge fully. Reconnect the battery firmly and turn the key back on. Check if the error code clears or immediately returns. Step 2: Inspect the Battery and Power Connections
In the vast majority of cases, especially with a newer or well-maintained machine, these simple steps will clear the error and restore normal operation. This error is often the result of a simple oversight during startup and can be resolved without any mechanical intervention.
Disclaimer: This guide is for informational purposes. Always consult the specific Jungheinrich service manual for your model and serial number range, as error code definitions can vary between machine generations. Occasionally, software bugs or glitches within the machine's
1901.1 – Drive pedal activated during startup. drive pedal when the parking brake is not released. activated at the same time. Machine Maxx USA Jungheinrich Forklift Error Codes - Machine Maxx USA
If the pedal feels or doesn't return to the neutral position? Jungheinrich Forklift Error Codes - Machine Maxx USA
The first step is always to consult the machine's operator manual or technical documentation. Jungheinrich provides detailed guides on error codes, including troubleshooting steps.
Ensure the parking brake is fully released (Error 1909.1 is also related to pedal activation while the brake is engaged). If you want, I can produce a step-by-step
If the error persists, the pedal might be physically obstructed.
If all wiring checks out and the battery is healthy, the fault likely lies in the Vehicle Controller itself. Replacing a main controller on a Jungheinrich truck usually requires a dealer-level service laptop (Jungheinrich ProBot or similar) to program the new controller to the truck's specific parameters. This is typically not a DIY repair.
: Switch the truck off, wait a few seconds, and then turn it back on without touching the pedal. Check for Obstructions