I have a hyster reach truck R2.0. It come up with the fault Alarm Mod 05, VMN Low. im having the same problem.

I have had the forlift checked by Briggs who i must say have already charge me a chunk of money and still not fixed my fork lift.

The truck when you switch it on wont reset the drive wheel and therefore will not work and just throw up this code.

My current battery shows 49.9 volts, however i did attach a slave battery to my truck and that showed 51 volts.

When i then started my truck with the slave battery it then showed the same fault code but this time it said VMN High

Can anyone please advise me on how to fix my forklift