Ok this is weird.
04 1500 Siverado
-Read the program saved & saved as new name
-Did the 1bar RTT OS upgrade then uploaded to the PCM
Now I'm locked out
cant read the PCM cant write to the PCM
Can see the vin and connect but not read or program
I keep getting...
"security access denied - invalid authorization code"
pulled all the PCM fuse, and checked the cigarette lighter fuse
unplugged all the cables usb and OBD and restared the laptop
unplugged the battery and touched the cables together
checked voltage at the cig lighter
called prior tuner 12secss and made sure he did not lock the PCM
Still nothing.
"security access denied - invalid authorization code"
How can I have read and programmed this PCM but be locked out?
Did I miss a fuse?
TAD