I can't get my 2000 Blazer to go into 4 wheel drive. When the car is in park nothing happens (no lights or noises) when I press 4HI or 4LO. When I put it in Neutral and press the 4HI button, a clicking noise comes from the TCCM and both the 4HI and 4LO light flash for a few seconds, then go out. The car is still in 2 wheel drive. Suggestions?

I can't get my 2000 Blazer to go into 4 wheel drive. When the car is in park nothing happens (no lights or noises) when I press 4HI or 4LO. When I put it in Neutral and press the 4HI button, a clicking noise comes from the TCCM and both the 4HI and 4LO light flash for a few seconds, then go out. The car is still in 2 wheel drive. Suggestions?

We need to know which transfer case you have?

Auto 4W or just the regular?

It has just the regular transfer case. There is no check engine light showing.

Ground pin 13 on the diagnostic connector and turn key on and read codes from shift button lights.
Post back codes.

Sorry, but I'm not a mechanic and don't have a "diagnostic" tester. I plan to bring the car to a local garage but don't want them to start replacing part after part until the problem is fixed. Wanted to "guide" them a little bit in the hope of limiting my costs. Thanks anyway.

Sorry, but I'm not a mechanic and don't have a "diagnostic" tester. I plan to bring the car to a local garage but don't want them to start replacing part after part until the problem is fixed. Wanted to "guide" them a little bit in the hope of limiting my costs. Thanks anyway.

All you need to get codes is to ground pin 13.