DTC Codes anyone know?? Vx V6, googled with no luck

[vx_commodore]

Hey again all, anyone have a list or can tell me the errors on my car in the special hidden menu, I tryed google but cant find the code list anywhere...
This is my dtc list..
00 --
01 --
02 --
03 nu
04 --
05 --
06 --
07 nu
08 --
09 --
10 nu
11 --
12 --
13 --
14 --
15 --
16 --
17 --
18 --
19 HC <---- Whats this?
20 HC <---- Whats this?
21 nu
22 nu
23 nu
24 --
25 --
26 --
27 nu
28 nu
29 nu
30 nu
31 nu
So as you can see #19 & 20 have HC next to them wich means it has logged a trouble code and it is still current.
Had a look thrugh my gregory's book but no luck as usual... Anyone shed some light on what them trouble codes are??
Iv'e got an idea that one of the trouble code's may be for the airbag because i have a calais cluster in my s-pack. airbag beeps at me when i start the car, haven't got around to goen to holden to get it fixed yet..
Thanx again...

[oska]

code 19 = PCM
code 20 = SDM

[lout]

VT-VX Hidden Trip Computer
you want page 5
like oska said an error with pcm and sdm (SRS)

[vx_commodore]

ohh sorry i looked on search for ages and couldent find that list!! thanx for the help!, so if 1 of the errors are SRS fault as suspected what is the other (pcm)? <whats that mean? or they both refer to airbag?

[lout]

probably just a display calibration required, set up number of airbags and whatever is out of range in PCM. powertrain control module controls engine and transmission

[oska]

as above

short pin 5 and 6 on the OBD socket under steering wheel, turn ignition on

the engine light will flash and you'll be able to get the error code

there's plenty of info about the codes on here