Either the wiring fault is intermittent (false hope) or the sensor resistance is borderline – fine at startup but drifts out of range when warm.
Jungheinrich Forklift Error Codes - Machine Maxx USA. * 0915.2 – Industrial truck not ready for operation – battery door opened. * Machine Maxx USA Jungheinrich Forklift Truck Fault Codes DTC.pdf Jungheinrich Error Code 1901
If the pedal returns physically but the code persists, the fault is likely electronic. Inspect the wiring harness routing from the pedal through the right and left chassis steps back to the controller module. Look for pinched wires, exposed copper, or loose connector plugs. Clean any corroded connections with electrical contact cleaner. Either the wiring fault is intermittent (false hope)