When A Key On A Computer Keyboard Gets Stuck: Keyboard Codes And Their Hex Scan Code Values

Due to water, coffee or any liquid spill, a keyboard’s key may get stuck and an error is displayed on computer screen when starting BIOS;

ERROR 0210: Stuck key 4B

Press <F1> to Setup

Here are the codes corresponding to every key on a keyboard;

Code	Key	Code	Key	Code	Key
00	NoKey	3D	F3	70	ALT-F9
01	ALT-Esc	3E	F4	71	ALT-F10
02	ALT-Space	3F	F5	72	CTRL-PrtSc
04	CTRL-Ins	40	F6	73	CTRL-Left
05	SHIFT-Ins	41	F7	74	CTRL-Right
06	CTRL-Del	42	F8	75	CTRL-end
07	SHIFT-Del	43	F9	76	CTRL-PgDn
08	ALT-Back	44	F10	77	CTRL-Home
09	ALT-SHIFT-Back	47	Home	78	ALT-1
0F	SHIFT-Tab	48	Up	79	ALT-2
10	ALT-Q	49	PgUp	7A	ALT-3
11	ALT-W	4B	Left	7B	ALT-4
12	ALT-E	4C	Center	7C	ALT-5
13	ALT-R	4D	Right	7D	ALT-6
14	ALT-T	4E	ALT-GrayPlus	7E	ALT-7
15	ALT-Y	4F	end	7F	ALT-8
16	ALT-U	50	Down	80	ALT-9
17	ALT-I	51	PgDn	81	ALT-0
18	ALT-O	52	Ins	82	ALT-Minus
19	ALT-P	53	Del	83	ALT-Equal
1A	ALT-LftBrack	54	SHIFT-F1	84	CTRL-PgUp
1B	ALT-RgtBrack	55	SHIFT-F2	85	F11
1E	ALT-A	56	SHIFT-F3	86	F12
1F	ALT-S	57	SHIFT-F4	87	SHIFT-F11
20	ALT-D	58	SHIFT-F5	88	SHIFT-F12
21	ALT-F	59	SHIFT-F6	89	CTRL-F11
22	ALT-G	5A	SHIFT-F7	8A	CTRL-F12
23	ALT-H	5B	SHIFT-F8	8B	ALT-F11
24	ALT-J	5C	SHIFT-F9	8C	ALT-F12
25	ALT-K	5D	SHIFT-F10	8D	CTRL-Up
26	ALT-L	5E	CTRL-F1	8E	CTRL-Minus
27	ALT-SemiCol	5F	CTRL-F2	8F	CTRL-Center
28	ALT-Quote	60	CTRL-F3	90	CTRL-GreyPlus
29	ALT-OpQuote	61	CTRL-F4	91	CTRL-Down
2B	ALT-BkSlash	62	CTRL-F5	94	CTRL-Tab
2C	ALT-Z	63	CTRL-F6	97	ALT-Home
2D	ALT-X	64	CTRL-F7	98	ALT-Up
2E	ALT-C	65	CTRL-F8	99	ALT-PgUp
2F	ALT-V	66	CTRL-F9	9B	ALT-Left
30	ALT-B	67	CTRL-F10	9D	ALT-Right
31	ALT-N	68	ALT-F1	9F	ALT-end
32	ALT-M	69	ALT-F2	A0	ALT-Down
33	ALT-Comma	6A	ALT-F3	A1	ALT-PgDn
34	ALT-Period	6B	ALT-F4	A2	ALT-Ins
35	ALT-Slash	6C	ALT-F5	A3	ALT-Del
37	ALT-GreyAst	6D	ALT-F6	A5	ALT-Tab
3B	F1	6E	ALT-F7
3C	F2	6F	ALT-F8

Special Key Scan Codes:

A list of scan codes for special keys and combinations with the SHIFT, ALT and CTRL keys can be found in the following table: They are for quick reference only.

Key	Code	SHIFT-Key	CTRL-Key	Alt-Key
NoKey	00
F1	3B	54	5E	68
F2	3C	55	5F	69
F3	3D	56	60	6A
F4	3E	57	61	6B
F5	3F	58	62	6C
F6	40	59	63	6D
F7	41	5A	64	6E
F8	42	5B	65	6F
F9	43	5C	66	70
F10	44	5D	67	71
F11	85	87	89	8B
F12	86	88	8A	8C
Home	47		77	97
Up	48		8D	98
PgUp	49		84	99
Left	4B		73	9B
Center	4C		8F
Right	4D		74	9D
end	4F		75	9F
Down	50		91	A0
PgDn	51		76	A1
Ins	52	05	04	A2
Del	53	07	06	A3
Tab	8	0F	94	A5
GreyPlus			90	4E

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Hex Scan Code	Key	Hex Scan Code	Key	Hex Scan Code	Key	Hex Scan Code	Key	Hex Scan Code	Key	Hex Scan Code	Key
		20	D	40	F6	60	Ctrl F3	80	Alt 9	A0	Alt Dn Arrow
01	ESC	21	F	41	F7	61	Ctrl F4	81	Alt 0	A1	Alt PgDn
02	1	22	G	42	F8	62	Ctrl F5	82	Alt –	A2	Alt Ins
03	2	23	H	43	F9	63	Ctrl F6	82	Alt =	A3	Alt Del
04	3	24	J	44	F10	64	Ctrl F7	84	Ctrl PgUp	A4	Alt / (num)
05	4	25	K	45	Num Lk	65	Ctrl F8	85	F11	A5	Alt Tab
06	5	26	L	46	Scrl Lk	66	Ctrl F9	86	F12	A6	Alt Enter (num)
07	6	27	; :	47	Home	67	Ctrl F10	87	SH F11
08	7	28	‘ “	48	Up Arrow	68	Alt F1	88	SH F12
09	8	29	` ~	49	Pg Up	69	Alt F2	89	Ctrl F11
0A	9	2A	L SH	4A	– (num)	6A	Alt F3	8A	Ctrl F12
0B	0	2B	\ |	4B	4 Left Arrow	6B	Alt F4	8B	Alt F11
0C	– _	2C	Z	4C	5 (num)	6C	Alt F5	8C	Alt F12
0D	= +	2D	X	4D	6 Rt Arrow	6D	Alt F6	8C	Ctrl Up Arrow
0E	BKSP	2E	C	4E	+ (num)	6E	Alt F7	8E	Ctrl – (num)
0F	Tab	2F	V	4F	1 End	6F	Alt F8	8F	Ctrl 5 (num)
10	Q	30	B	50	2 Dn Arrow	70	Alt F9	90	Ctrl + (num)
11	W	31	N	51	3 Pg Dn	71	Alt F10	91	Ctrl Dn  Arrow
12	E	32	M	52	0 Ins	72	Ctrl PtScr	92	Ctrl Ins
13	R	33	, <	53	Del .	73	Ctrl L Arrow	93	Ctrl Del
14	T	34	. >	54	SH F1	74	Ctrl R Arrow	94	Ctrl Tab
15	Y	35	/ ?	55	SH F2	75	Ctrl End	95	Ctrl / (num)
16	U	36	R SH	56	SH F3	76	Ctrl PgDn	96	Ctrl * (num)
17	I	37	PtScr	57	SH F4	77	Ctrl Home	97	Alt Home
18	O	38	Alt	58	SH F5	78	Alt 1	98	Alt Up Arrow
19	P	39	Spc	59	SH F6	79	Alt 2	99	Alt PgUp
1A	[ {	3A	CpsLk	5A	SH F7	7A	Alt 3	9A
1B	] }	3B	F1	5B	SH F8	7B	Alt 4	9B	Alt Left Arrow
1C	Enter	3C	F2	5C	SH F9	7C	Alt 5	9C
1D	Ctrl	3D	F3	5D	SH F10	7D	Alt 6	9D	Alt Rt Arrow
1E	A	3E	F4	5E	Ctrl F1	7E	Alt 7	9E
1F	S	3F	F5	5F	Ctrl F2	7F	Alt 8	9F	Alt End

Keyboard Scan Codes

00 is normally an error code

01 (Esc)

02 (1!), 03 (2@), 04 (3#), 05 (4$), 06 (5%E), 07 (6^), 08 (7&), 09 (8*), 0a (9(), 0b (0)), 0c (-_), 0d (=+), 0e (Backspace)

0f (Tab), 10 (Q), 11 (W), 12 (E), 13 (R), 14 (T), 15 (Y), 16 (U), 17 (I), 18 (O), 19 (P), 1a ([{), 1b (]})

1c (Enter)

1d (LCtrl)

1e (A), 1f (S), 20 (D), 21 (F), 22 (G), 23 (H), 24 (J), 25 (K), 26 (L), 27 (;:), 28 (‘”)

29 (`~)

2a (LShift)

2b (|), on a 102-key keyboard

2c (Z), 2d (X), 2e (C), 2f (V), 30 (B), 31 (N), 32 (M), 33 (,<), 34 (.>), 35 (/?), 36 (RShift)

37 (Keypad-) or (/PrtScn) on a 83/84-key keyboard

38 (LAlt), 39 (Space bar),

3a (CapsLock)

3b (F1), 3c (F2), 3d (F3), 3e (F4), 3f (F5), 40 (F6), 41 (F7), 42 (F8), 43 (F9), 44 (F10)

45 (NumLock)

46 (ScrollLock)

47 (Keypad-7/Home), 48 (Keypad-8/Up), 49 (Keypad-9/PgUp)

4a (Keypad–)

4b (Keypad-4/Left), 4c (Keypad-5), 4d (Keypad-6/Right), 4e (Keypad-+)

4f (Keypad-1/End), 50 (Keypad-2/Down), 51 (Keypad-3/PgDn)

52 (Keypad-0/Ins), 53 (Keypad-./Del)

54 (Alt-SysRq) on a 84+ key keyboard

55 is less common; occurs e.g. as F11 on a Cherry G80-0777 keyboard, as F12 on a Telerate keyboard, as PF1 on a Focus 9000 keyboard, and as FN on an IBM ThinkPad.

56 mostly on non-US keyboards. It is often an unlabelled key to the left or to the right of the left Alt key.
57 (F11), 58 (F12) both on a 101+ key keyboard

59-5a-…-7f are less common. Assignment is essentially random. Scancodes 55-59 occur as F11-F15 on the Cherry G80-0777 keyboard. Scancodes 59-5c occur on the RC930 keyboard. X calls 5d `KEY_Begin’. Scancodes 61-64 occur on a Telerate keyboard. Scancodes 55, 6d, 6f, 73, 74, 77, 78, 79, 7a, 7b, 7c, 7e occur on the Focus 9000 keyboard. Scancodes 65, 67, 69, 6b occur on a Compaq Armada keyboard. Scancodes 66-68, 73 occur on the Cherry G81-3000 keyboard. Scancodes 70, 73, 79, 7b, 7d occur on a Japanese 86/106 keyboard.

When a key gets stuck on a computer keyboard;

Stuck key error means that one or more keys on the keyboard are stuck. It’s possible that a liquid spill can also cause one or more keys to electrically “short” causing the error. Inspect the keyboard and check if any keys are mechanically stuck.

If you’re mechanically handy you can remove the keyboard, inspect any chances of damage or corrosion. Plug it back and see if error is still occurring.

Reset BIOS to default settings. Perform Flee Power – remove the battery and any other peripheral device connected to the computer. Hold the power button for 10-15 seconds and then connect only the AC Adapter and turn ON the computer.

Simply grab alcohol-dipped cotton (preferably ear cotton swab) and unseat the key and the soft rubber (key presser) under it. Then wipe the surface under the affected key.

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Courtesy:

https://www.shsu.edu/~csc_tjm/fall2005/cs272/scan_codes.html

https://www.win.tue.nl/~aeb/linux/kbd/scancodes-1.html

Craig Peacock http://www.senet.com.au/~cpeacock/

https://www.freepascal.org/docs-html/current/rtl/keyboard/kbdscancode.html

http://www.quadibloc.com/comp/scan.htm

https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/When-booting-I-get-an-Error-0210-Stuck-Key-01-Lenovo-Thinkpad/td-p/1404855