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Note: Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or
action, in sequence.” If replacing a FRU does not solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.
This index can also help you determine, during regular servicing, what FRUs are likely to need to be
replaced next.
A numeric error is displayed for each error detected in POST or system operation. In the displays, n can
be any number.
If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not
described there, go to “Intermittent problems” on page 43.
Note: For a device not supported by diagnostic codes in the ThinkPad Notebooks, see the manual for
that device.
Numeric error codes
Table 2. Numeric error codes
Symptom or error
FRU or action, in sequence
0177
Bad SVP data, stop POST task—The checksum of the
supervisor password in the EEPROM is not correct.
System board
0182
Bad CRC2. Enter UEFI BIOS Setup and load Setup
defaults.—The checksum of the CRS2 setting in the
EEPROM is not correct.
1. Run ThinkPad Setup. Press F9, and Enter to load
the default setting. Then save the current setting
by pressing F10.
2. System board
0183
Bad CRC of Security Settings in EFI Variable. Enter
ThinkPad Setup.
0187
EAIA data access error—The access to EEPROM is failed.
System board
0188
Invalid RFID Serialization Information Area.
System board
0189
Invalid RFID conguration information area—The
EEPROM checksum is not correct.
System board
0190
Critical low-battery error
1. Charge the battery pack.
2. Battery pack
0191
System Security—Invalid Remote Change requested.
1. Run ThinkPad Setup, and then save current
setting by pressing F10.
2. System board
0199
System Security— Security password retry count
exceeded.
1. Run ThinkPad Setup, and then save the current
setting by pressing F10.
2. System board
0251
System CMOS checksum bad— Default conguration
used.
1. Charge the backup battery for more than 8 hours
by connecting the ac adapter.
2. Replace the backup battery and run ThinkPad Setup
to reset the time and date.
0271
Real-time clock error. Check date and time settings.
Run ThinkPad Setup to reset the time and date.
40 ThinkPad T520, T520i, and W520 Hardware Maintenance Manual