HELLO GENTLEMAN, I HAVE A 1999 ZR2 PRETTY SWEET, I DO HAVE AN ISSUE THO, THE TRUCK SAT FOR 8 MONTHS, BATTERY WENT DEAD,SO GETTING READY TO DRIVE IT AGAIN ALL 4 TRANSFER CASE INDICATOR LIGHTS ARE LIT UP ON THE SWITCH (YELLOW ONES) THE TRANS IS ALL DONE UPSHIFTING AND GOES INTO OVERDRIVE AT ABOUT 10 MILES AN HOUR, I PULLED THE 15 AMP FUSE FOR THE FOUR WHEEL DRIVE THE TRANS SHIFTS NORMALLY THE TRANSFER CASE LIGHTS ARE OUT OF COURSE, PUT THE FUSE BACK IN AND THE SAME PROBLEM HAPPENS, THE TRANS OR PCM SEEMS TO HAVE THE TRANS AND TRANSFER CASE INTO LIMP OR DUMMY MODE I THINK???? UNDERHOOD INSPECTION ALL SEEMS OK, UNDERBOY CHECK OK NO MICE HAVE EATEN ANYTHING THAT I CAN SEE ??? ANY IDEAS GUYS? MAYBE A RE-LEARN HAS TO BE DONE BEFORE I TAKE IT TO MR. GOODWRENCH AND HAVE IT RESOLVED PROFESSIONALLY. THANKS FOR ANY HELP. JOHN

 

Welcome from New Zealand.

 

Welcome. Hmmm...yeah, does sound like a computer issue. Not sure.