Hello group, this Ls1 blazer 4X2 vehicle mod. Transmision 2000 4L60-E has light soon engiene check on all the time with a P0785 stored, when this occurs has started third gear (protective mode of the rms). Usually occurs after a cold start after traveling for about 10 minutes osea already reached an optimum temperature for about 2 minutes turn off the truck and it comes Cined first all day works only until a Vielva cool. The connections have been found in the transmission and PCM. Grounds have been verified. power transmission in the fuse for the newsletter n º 01-07-03-002C, without loss of energy when the problem occurs. With a voltmeter connected to the white # 13 c1 3-2 VCM blue harness when a change is voltage drops close to 0, but appears to be low until the vehicle is cold again. I rendered services to the transmission and replaced the 3-2 shift solenoid, but does not correct the problem. . We also tested the flow of .459 amps amp solenoid. The scan shows the 3-2 downshift solenoid is activated at any time once more only once in a while. I find that you can sort the solenoid on and off with a scanner but the operation seems slow when looking at the voltmeter. At this point I think I'm facing a problem VCM but we hope with your help I'm not missing something more congenial. Any help would be great. Drop me a note with any questions or thoughts. Thanks highlander43613@msn.com

 

My shop does not do any internal trans work, however this truck is in the time frame when they had a problem with the ignition switch. The switch would drop power circuits for the trans and lead to the MIL being illuminated. It is an intermittent problem as you have described. Replace you ignition switch (not where the key goes). I would be willing to bet it will fix your issue. I have seen this many times.

 

Gracias ypot tu ayuda cuanto vale el swich??

 

Huh????

 

"Gracias ypot tu ayuda cuanto vale el swich??"

Thanks for your help how much does the switch cost?... or something like that.
I'm working on a S-10 with similar issues but also with loss of comm. with EBCM and theft deter. Could these all be related to the switch?

 

I thought he was telling you to kiss his a**...hahahahahahahaha...