Security access denied (98 to 99PCM)

[01 MidMet WS6]

Hello,
I am trying to tune a 98 Camaro and cannot get passed the Security access denied screen during a read entire. I have been told that this vehicle has a 1999 pcm (installed at another shop). How do I get passed this? Is it an issue that the VIN does not jive with the PCM? Also in the write entire screen there is no OS # nor a TCM OS#. I have access to a Tech 2 and could do a dealer reflash if that would help but do I reflash to a 99 VIN or his current? Also, If I have another licensed 99 file could I perform a write entire and start from scratch? Thanks in advance!!!

Carl T.

[Bill@HPTuners]

Sounds like the pcm has been tunerlocked.

[RWTD]

Carl, you can't just install a '99 pcm into a '98 F-body. The wiring is completely different. It would have to be repinned, and there is like 1 or 2 sensors that have to be modified/swapped. This is a painstaking process, too. Some have elected to install a '99+ wiring harness. You'll have a leftover plug, and there is a gentleman on LS1Tech that has done several of these swaps, and knows exactly what to do here (you'll have to do a search).

[01 MidMet WS6]

Update:
The PCM that was in the car was previously tuned using Tunercat and although it supposedly was not locked there format must not be readable by HPTuners. That being said I installed a PCM from a 2000 Tahoe, disabled VATs and used that instead. Everything went well other than the A.C. no longer works and the Fuel Gauge is inoperative. I heard that there is a segment swap available using express van tables? Anyone know anything about this? Thanks!