whats the serial number of this truck?

based on an assumption that this truck may be a 36v truck with AC controllers, there is a HPK document out on this alarm code, Alarm 58 on Mod1.

Two potential causes of this alarm are
The SICOS was just replaced
OR...
There is a problem with the pressure transducer or the related wiring

If it was triggered after a SICOS replacement then the SICOS EEPROM will have to be cleared using the diagnostic program.

If it is the latter problem then:
If this alarm occurs during run-time operation, Check the following:

The output voltage of the pressure transducer is 0.0 - 6.0 volts. The voltage values increase with pressure. The pressure range for the transducer is 0 - 3625 PSI.

The output voltage should be measured at Myhrio connection XA5C:1
Input voltage to the pressure transducer should be 14 volts when measured from XA5C6 (positive) and XA5C:3 (negative).

hope this helps