Not sure if this is your problem or not but in my blazer my gauges would just start going crazy at random times and sometimes the my speed would be accurate and other times it would be 10 mph off and the odometer and prnd123 would work sometimes and other times they wouldn't. after a lot of trying things I finally found the solder on the gauge cluster broke loose specifically at the PRND123 or the odometer I don't remember witch. I had to look at it under a magnifying glass and I could see some very slight movement after I soldered it back together it has been working great and I have not had any other problems with it. hope this helps you out.
SOURCE: Chevy Steering Column
If you got an older year column, you no longer have pass key 3 rfi receiver in it and the vehicle thinks you are stealing it.
SOURCE: 1999 blazer guages not working
It sounds like the wire harness in the back of the instument cluster has gone lose. Check the wire harness. Good luck
SOURCE: SEcurity light came and car wouldnt start
did you get a new sterio this happened when i put a new system in and i had to keep axillery power to the factory stereo so the car would start
SOURCE: odometer\tripmeter stop working
Pull the drive cable out of the odometer and try to turn it. If it turns the drive in your gearbox is worn out and needs to be replaced.
SOURCE: 1997 chevy blazer key stuck in ignition AGAIN GRRRRRRR
I have worked on several vehicles with this same problem and each one was a relatively simple repair with no parts involved, first off the shift interlock has nothing to do with it and will not prevent your vehicle from going into park, it is designed to work ONLY when coming out of park. The problem your having depends on the type of shifter handle your vehicle has, if the release lever is on the bottom and you have to push up with your fingers to release it, then the problem is...there is a rubber type cover that surrounds the release button, after time it becomes distorted and bunches up preventing the shifter from fully engaging in the park position (even though it appears the vehicle is going into park)if your careful you can work the rubber cover out and your problem is fixed. If your shifter button is on the side and pressed with your thumb the cable needs to be adjusted, this cables only purpose is to prevent key removal except when in park and is easily adjusted, with the center council removed, if you look at the front of the shifter base you will see 2 cables that snap into the shifter frame, the larger one is the gear selector cable, the smaller one runs up to the steering column and operates the mechanism that prevents key removal, where the cable snaps into the shifter frame is where the adjustment is done and is identical to a kick-down cable used on older vehicles with automatic transmissions, right where it snaps into the frame there will be a button you can press down releasing a spring loaded adjustment arm, make sure you first mark the arm for reference then press down the button and adjust it a little either way until it functions properly, hope this helps and good luck
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