Hello John,
Thank you very much for your answer!
I made a little mistake, my Forklift is a ESC 213 and not a ESC 216.

86 Improbable speed,sudden change:
? AS4803L: 2 sensor systems differ from each other (actual value transmitter)
F,H-AC L-AC
IMPROB. SPEED Check cable connection;
Replace speed sensor;
Replace component; Z Are the number of pulses correct (8 or 64 pulses/ revolution)?
Improbable speed, sudden change: ? PM2402L/2 from V1.60: PM2402z: actual value transmitter on the steer motor provides faulty signals
IMPROB. SPEED Check wiring and plug connections, check wire routing (do not route together with motor supply wires); replace sensor.