Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Sign in to follow this  

Recommended Posts

I have a 2003 2500HD Silverado...the 4 wheel drive won't engage. I do not have auto 4wd.

when I press the button to switch to 4wd, the light just blinks and then returns to a solid light on 2wd.

 

I can here a click after I press the button, but I cannot hear the shift motor running. My question is, is there a way to decipher whether my problem is the shift actuator, or the shift motor. I think it is the shift motor, but not sure

 

Thanks in advance any help is appreciated.

Share this post


Link to post
Share on other sites

You need to get it scanned for codes with a scanner able to read TCCM codes ,

 

Don't guess

  • Like 1

Share this post


Link to post
Share on other sites

Ok, got it scanned today, no TCCM codes were found.

 

any Ideas where to go from there?

Share this post


Link to post
Share on other sites

I went to the mechanic that works on the vehicles at work, I don't know what kind of scanner he used, he was baffled as well. He said it's possible that if there are no "dummy lights" or anything reading on the dic it won't store a code? I'm taking it tomorrow to an independent mechanic to run codes.

Share this post


Link to post
Share on other sites

How do I tell if my scanner reads TCCM codes? I just bought an

Equus / Innova 3130 / 1303 CAN OBD 2 Pro Global Scan Tool

 

Thanks

Share this post


Link to post
Share on other sites

Can I swap the TCCM from my 2004 Suburban to my 2006 Sierra and see if that is my problem? Part numbers are the same, just wondering if programming or something else is different. No lights on switch and no 4WD. Have swapped switch already.

Thanks.

Share this post


Link to post
Share on other sites

I didn't start a new thread, maybe you are talking to kdeerman?

 

Anyhow, I finally got the truck re-scanned. No codes found, however, was able to test actuator and tested good through scan tool (snap on). I tested ohms on the selector switch....2H tested at 1680 ohms, 4H, 860, and 4L showed only one ohm. I'm thinking selector switch, what do you think Rob?

Share this post


Link to post
Share on other sites

ok, tried new selector switch...no go. I'll be able to take it back for a refund. Narrows it down to two..shift motor or TCCM. I'm thinking if the TCCM is bad perhaps that is the reason it's not throwing codes?

  • Like 1

Share this post


Link to post
Share on other sites

Remember this the next time you buy a truck. Get a manual-shift transfer case!

  • Like 1

Share this post


Link to post
Share on other sites

Remember this the next time you buy a truck. Get a manual-shift transfer case!

 

Like manual transmission they are slowly being obsolete. As far as I've seen, they pretty much are already obsolete with newer trucks.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.