2004 mod H2
Trying to read or to write into pcm, but get this message in
step 3. Requesting access : Security Access Denied - Invalid Authorization Code

Have been working to this pcm, all seams to be fine, then suddenly this message arrives. Happens from time to time, and makes me very confused.
Have costed me 6 credits for this car (tried a new hp tuner just to make sure mine were not damaged), and a lot of time. Hope someone can help. http://www.hptuners.com/forum/images/smilies/smile.png

Any idea?

Pal