new guy with truck problems!!

[jordan97z71]

Hey guys!

New here, I own a 1997 chevy silverado 1500 with the 5.7. I have searched this site and the internet and i think I have figured out my problem but I just want to see if i can confirm this with you guys.

It only happens every so often but what happens is the instrument cluster go wacky, meaning the tach stops and the speedo doesn't work right. I also loose my sift position light and my check engine light comes on. and I seem to be stuck in third gear. I am also getting these codes.

1.) P0740

2.) P0753

3.) P0758

4.) P0785

5.) P1860

 

I am pretty sure the problem is the ignition switch but i want to be sure before i have it looked at. Is there a possibility that it could be the solenoid in the tranny??

Thanks for your help!!

Jordan

[ChevyTech007]

It is the ignition switch. Done many.

[mindfrost82]

Instead of starting a new thread, I figured I would just revive this one.

 

I have an '04 GMC Sierra 2500HD Crew Cab 4x4 6.0 liter.

 

It was previously my dad's and he never had any problems with it at all. The week I bought it the check engine light came on even though it was running fine. After driving it for a while the tach started acting up. It seemed like it got stuck and it was registering higher than it should have been. Even though it was idling fine, the tach was up to 5000.

 

Then the light went off.

 

Then about a week later the light came back on and it seemed to get stuck at 3rd gear. I would get up to 55mph and the tach was reading about 4000 rpm. So I turned around and parked it for the day.

 

After work I got back in it and the light was still on but it was driving fine. I took it to AutoZone and they said it was showing code P0758 - Shift Solinoid Electrical.

 

After driving it a little longer the light went off and stayed off for about a week. It was driving perfectly.

 

Well tonight the speedometer started acting up. The check engine light isn't on. It was reading 30mph higher. If I was stopped it was stuck at 30 and when I was going about 30 it was reading 60.

 

So its sitting in my driveway after that and I'll see what it does in the morning.

 

If the OP is still around, was your's the ignition switch or something else?

 

Does this sound like the ignition switch or something else? If it is the ignition switch, any idea how much that would cost to have replaced? Is it really complicated or could it be a DIY job?

 

Any information is appreciated. Thanks!