LTC6811 VRegB Voltage above 3.01V

How big is the capacitor on VREF2?  Does it measure 3.178 with a multimeter?

Does VREF1 have any loads attached?  If there is a VREF1 load it will make VREF2 voltage appear too high.

Sorry. I had made a mistake. I thought that VRegB from the supplied driver, referred to the VREF2. 

VREF2 measured with the multimeter does indeed measure 3.0.  Reading that VREF2 from the Aux registers does report 3V 

What is VRegB?  I'm not aware of such a register or supply rail and also can't find that text in the datasheet.  I assumed this is VREF2 as it is expected to be 3V.

The REF register should be in this range.

Assuming this 3.178 is the REF register and VREF2 measures correctly then VREF1 is of concern.  VREF1 pin is no loads allowed and must have a 1uF bypass capacitor only.

Sorry VregD, this is code from the Linduino examples, in the comment is says Vref2, but that is a mistake:

/*!****************************************************************************
  \brief Prints Status voltage codes and Vref2 voltage code onto the serial port
 @return void
 *****************************************************************************/
void print_stat(void)
{
   double itmp;
  for (uint8_t current_ic =0 ; current_ic < TOTAL_IC; current_ic++)
  {
    Serial.print(F(" IC "));
    Serial.print(current_ic+1,DEC);
    Serial.print(F(": "));
    Serial.print(F(" SOC:"));
    Serial.print(BMS_IC[current_ic].stat.stat_codes[0]*0.0001*20,4);
    Serial.print(F(","));
    Serial.print(F(" Itemp:"));
    itmp = (double)((BMS_IC[current_ic].stat.stat_codes[1] * (0.0001 / 0.0075)) - 273);   //Internal Die Temperature(°C) = itmp • (100 µV / 7.5mV)°C - 273°C
    Serial.print(itmp,4);
    Serial.print(F(","));
    Serial.print(F(" VregA:"));
    Serial.print(BMS_IC[current_ic].stat.stat_codes[2]*0.0001,4);
    Serial.print(F(","));
    Serial.print(F(" VregD:"));
    Serial.print(BMS_IC[current_ic].stat.stat_codes[3]*0.0001,4);
    Serial.println();
    Serial.print(F(" Flags:"));
    Serial.print(F(" 0x"));
    serial_print_hex(BMS_IC[current_ic].stat.flags[0]);
    Serial.print(F(", 0x"));
    serial_print_hex(BMS_IC[current_ic].stat.flags[1]);
    Serial.print(F(", 0x"));
    serial_print_hex(BMS_IC[current_ic].stat.flags[2]);
    Serial.print(F("   Mux fail flag:"));
    Serial.print(F(" 0x"));
    serial_print_hex(BMS_IC[current_ic].stat.mux_fail[0]);
    Serial.print(F("   THSD:"));
    Serial.print(F(" 0x"));
    serial_print_hex(BMS_IC[current_ic].stat.thsd[0]);
    Serial.println("\n");  
  }
}

VREGD normal range is 2.7V to 3.6V.  It is only the digital supply voltage so the precise value is not so important.