JK BMS wrong Voltage Readings (all 16 cells wrong)

[Marv21]

Hello Guys,
it seems i have a broken BMS and hope you can help me fix it.
The BMS measures every single cell with to much voltage. The cells are all around 3,25V, not 3,44V. The total Voltage is ~52V not ~55V.
I put in another JK BMS, this worked correctly - so no wrong wiring, no contact issues.(At least not on the Battery End)
This has to be a BMS Hardware or Software Failure.
Any ideas?

EDIT1: Under advanced Config, all Wire Ressistances are 0.

 

[Marv21]

OK that one was too quick asked...

I calibrated the Voltage - they are fine now (The current is still 30% off...)

 

[再生可能 エネルギー]

OK that one was too quick asked...

I calibrated the Voltage - they are fine now (The current is still 30% off...)

How do you proceed to calibrate the voltage?

 

[BentleyJ]

You have to use a good hand held multimeter, measure the actual voltage on the batt + and - terminals. Then the accurate value can be manually entered in the BMS set up menu where the number of cells, batt capacity etc. are put in by the user.

 

[OffgridSystems]

And you can calibrate the current the same way.

 

[OffGridForGood]

And you can calibrate the current the same way.

WHAT?? Really ?? OMG !!!
I totally missed this, I have wondered WTH was up with some of the packs reporting wildly wrong current (compared with my meter) but yesterday after reading @OffgridSystems 's post, I suddenly realized I completely missed this step!. Today I input the corrected current based on an accurate meter reading and BAM! now the current is correct up and down the range, and the BMS SOC is tracking properly. I can't thank you enough!