You shouldn't start by pulling the radio. The repair manual says there's a card in the glovebox (it's raining so I won't go out to see if I have a card in my glovebox).
I found this list and for me, and my 2004 Forenza, the first one worked:
4316
1156
5624
3241
2151
2145
5241
4524
4513
3451
3346
5436
4362
6361
1165
5843
2152
2512
2453
3451
4316
2253
3241
4353
2152
5613
1651
1554
4136
1325
3116
5324
5344
1636
1341
3265
4345
5513
5613
3265
3251
6645
5256
4513
6654
3644
2136
1641
1634
1326
2621
3413
3462
2346
2235
5632
4325
I'll have to remember this code every time I disconnect the battery.
After reviewing this forum, I'm sorry I didn't get a Chevy. What a maintenance nightmare.
code 5241
5241
Radio Code is 5241
1165
The code came with your car. The tiny metal number that came on the same keyring as your keys has this unique number.
The code is 1165
the code or the 2004 verona is 6361 just turn it on type it in and it will work.
Trouble code P0722 means:Output speed sensor circuit no signal
You need to call the dealer with the radio srl# and they can give you the code
Trouble code P2279 means: Intake air leak
My past experience was to call Suzuki with your vin#
Suzuki Verona 2004 RADIO CODE RADIO PASSCODE COD----4316 2152 4513 4362 1156 2145 3451 6361 5624 5241 3346 1165 3241 4524 5436 5613 1341 2453 1651 5445 2253 3116 4353 1636 5324 1325 6156 4236 3644 2661 5632