Transmission shifts and codes P0753, P0327 and P0323

[yelloh564]

My 2004 Silverado recently set codes for the KS P0327 and PO323, and it felt sluggish on acceleration. I thought I may have gotten some bad gas. Today while traveling about 65MPh with no MIL lamp or codes the trans went from 4th down to 3rd. I pulled over and checked things out. nothing abnormal seen then on acceleration again the MIL lamp lit up and I see I have now 3 codes. P0327, P0323 and P0753. The trans will only go from second to third gear, It feels like no first or 4th. any ideas I should look at first?

[MT-2500]

Originally Posted by yelloh564

My 2004 Silverado recently set codes for the KS P0327 and PO323, and it felt sluggish on acceleration. I thought I may have gotten some bad gas. Today while traveling about 65MPh with no MIL lamp or codes the trans went from 4th down to 3rd. I pulled over and checked things out. nothing abnormal seen then on acceleration again the MIL lamp lit up and I see I have now 3 codes. P0327, P0323 and P0753. The trans will only go from second to third gear, It feels like no first or 4th. any ideas I should look at first?

What size and engine and transmission?

Code 753 is for 1-2 shift solenoid/circuit.
that solenoid also controls shift into 3-OD.

Get a repair flow chart for that code and go threw it to find the problem.

Let us know how it goes.