transmission stuck in overdrive and codes PO753,PO758,P1351,P1860,P1864 and P1886

1996 CHEVROLET CHEYENNE
220,196 MILES • 3.6L • 6 CYL • 2WD • AUTOMATIC
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MIKE ECKEBRECHT
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I was at 80 mph, the transmission made a thud and the mil came on. the transmission I think is stuck in overdrive it goes in every gear.
codes pulled: PO753,PO758,P1351,P1860,P1864 and P1886.
Jul 14, 2020 at 4:05 PM
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KASEKENNY
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P0753 - 1-2 Shift Solenoid Electrical
P0758 - 2-3 Shift Solenoid Electrical
P1351 - IC Circuit High Voltage
P1860 - TCC PWM Solenoid Electrical
P1886 - 3-2 SS Valve Assembly Electrical

These codes are all pointing to an electrical issues or control module. I attached the testing that we need to run through in order to find out what this is. I attached the testing for the P0753 and P1351 as these two are the most likely cause or at least lead us to the issue. Each of the others are considered redundant or secondary codes.

Let's run through this and we can go from there. Thanks
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Jul 14, 2020 at 7:02 PM
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MIKE ECKEBRECHT
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After doing some test I found the Transmission fuse # 20/10 amp in the dash,had no power,that Lead comes from the ignition switch white wire, shook the wires at the ignition switch and the tech,Speedometer started to work. I then took a jumper wire from # 20 fuse to ignition hot and all codes went away. The ignition switch is bad.
Jul 20, 2020 at 4:17 PM
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MIKE ECKEBRECHT
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The ignition powers the transmission.
Jul 20, 2020 at 4:18 PM
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KASEKENNY
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Thanks for the update. That is good info and I am sure it will help others. Please come back to 2CarPros in the future. Thanks again.
Jul 20, 2020 at 8:14 PM