Electronics are enough to make you cry, sometimes. In your particular transmission, I think you have eight or 10 control modules acting on it. Each control module is a computer. That’s in addition to the ECM (engine control module — the mastercomputer) and the TCM (transmission control module). And, then there are the sensors, like the MAP (Mass Air Pressure) and MAF (Mass Air Flow), in addition to the TPS (Throttle Positioning Sensor) and on and on.
From the sound of it, I think it is more than likely the TCM that has gone bad, although, if your engine is performing poorly, it could be the ECM, though I don’t think that’s the case or you’d be telling me about it, too.
I hate to suggest starting over, but, here’s what I would do. I would go back to square one, insert the OBD-II probe and get a new analysis run. Then, look for any of the following codes that might point where the problem lies. I know there are a lot of numbers, but I think it will help you find the problem, or at least you have a start here and if you need a few dozen more codes I can find them for you. Keep me in the loop. Here’s the list:
4L60E Code (DTC) P0218 Transmission Fluid Over Temperature
4L60E Code (DTC) P0502 Vehicle Speed Sensor (VSS) Circuit Low
4L60E Code (DTC) P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent
4L60E Code (DTC) P0711 TFT Sensor Circuit Range/Performance
4L60E Code (DTC) P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low
4L60E Code (DTC) P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High
4L60E Code (DTC) P0716 Input Speed Sensor Circuit Intermittent
4L60E Code (DTC) P0717 Input Speed Sensor Circuit Low
4L60E Code (DTC) P0719 Brake Switch Circuit Low
4L60E Code (DTC) P0724 Brake Switch Circuit High
4L60E Code (DTC) P0730 Incorrect Gear Ratio
4L60E Code (DTC) P0741 TCC System Stuck Off
4L60E Code (DTC) P0742 TCC System Stuck On
4L60E Code (DTC) P0748 Pressure Control Solenoid Circuit
4L60E Code (DTC) P0751 1-2 Shift Solenoid Valve Performance
4L60E Code (DTC) P0753 1-2 Shift Solenoid Circuit
4L60E Code (DTC) P0756 2-3 Shift Solenoid Valve Performance
4L60E Code (DTC) P0758 2-3 Shift Solenoid Circuit
4L60E Code (DTC) P1520 Gear Indicator System
4L60E Code (DTC) P1521 Transmission Engaged At High Throttle Angle
4L60E Code (DTC) P1522 Park/Neutral To Drive/Reverse At High RPM
4L60E Code (DTC) P1523 Electronic Throttle Control Throttle Return
4L60E Code (DTC) P1527 Transmission Range/Pressure Switch Comparison
4L60E Code (DTC) P1700 Transmission MIL Request
4L60E Code (DTC) P1701 Transmission MIL Request Circuit
4L60E Code (DTC) P1705 P/N Signal Output Circuit
4L60E Code (DTC) P1740 Transmission Torque Reduction Request Circuit
4L60E Code (DTC) P1743 TP Signal From ECM
4L60E Code (DTC) P1760 ECM Supply Voltage Interrupted
4L60E Code (DTC) P1779 Engine Torque Delivered To TCM Signal
4L60E Code (DTC) P1780 Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit
4L60E Code (DTC) P1790 Transmission Control Module Checksum
4L60E Code (DTC) P1791 Transmission Control Module Loop
4L60E Code (DTC) P1792 Transmission Control Module Reprogrammable Memory
4L60E Code (DTC) P1793 Transmission control Module Stack Overrun
4L60E Code (DTC) P1795 CAN Bus-Throttle Body Position
4L60E Code (DTC) P1800 TCM Power Control Relay Circuit Open
4L60E Code (DTC) P1801 Performance Selector Switch Failure
4L60E Code (DTC) P1804 Ground Control Relay
4L60E Code (DTC) P1810 TFP Valve Position Switch Circuit
4L60E Code (DTC) P1811 Maximum Adapt and Long Shift
4L60E Code (DTC) P1812 Transmission Over Temperature Condition
4L60E Code (DTC) P1813 Torque Control
4L60E Code (DTC) P1814 Torque Converter Overstressed
4L60E Code (DTC) P1815 Transmission Range Switch-Start In Wrong Range
4L60E Code (DTC) P1816 TFP Valve Position Switch-Park/Neutral With Drive Ratio
4L60E Code (DTC) P1817 TFP Valve Position Switch-Reverse With Drive Ratio
4L60E Code (DTC) P1818 TFP Valve Position Switch-Drive Without Drive Ratio
4L60E Code (DTC) P1819 Internal Mode Swtich No Start, Wrong Range
4L60E Code (DTC) P1820 Internal Mode Switch Circuit A Low
4L60E Code (DTC) P1822 Internal Mode Switch Circuit B High
4L60E Code (DTC) P1823 Internal Mode Switch Circuit P Low
4L60E Code (DTC) P1825 Internal Mode Switch Illegal Range
4L60E Code (DTC) P1826 Internal Mode Switch Circuit C High
4L60E Code (DTC) P1831 PC Solenoid Power Circuit Low Voltage
4L60E Code (DTC) P1833 A/T Solenoids Power Circuit Low Voltage
4L60E Code (DTC) P1835 Kick-Down Switch
4L60E Code (DTC) P1836 Kick-Down Switch Failed Open
4L60E Code (DTC) P1837 Kick-Down Switch Failed Short
4L60E Code (DTC) P1842 1-2 Shift Solenoid Circuit Low Voltage
4L60E Code (DTC) P1843 1-2 Shift Solenoid Circuit High Voltage
4L60E Code (DTC) P1844 Torque Reduction Signal Circuit Desired By TCM
4L60E Code (DTC) P1845 Transmission Gear Ratio Output Circuit
4L60E Code (DTC) P1847 2-3 Shift Solenoid Circuit High Voltage
4L60E Code (DTC) P1850 Brake Band Apply Solenoid Circuit
4L60E Code (DTC) P1851 Brake Band Apply Solenoid Performance
4L60E Code (DTC) P1852 Brake Band Apply Solenoid Low Voltage
4L60E Code (DTC) P1853 Brake Band Apply Solenoid High Voltage
4L60E Code (DTC) P1860 TCC PWM Solenoid Circuit Electrical
4L60E Code (DTC) P1864 Torque Converter Clutch Circuit
4L60E Code (DTC) P1868 Transmission Fluid Life
4L60E Code (DTC) P1870 Transmission Component Slipping
4L60E Code (DTC) P1871 Undefined Gear Ratio
4L60E Code (DTC) P1873 TCC Stator Temp. Switch Circuit Low
4L60E Code (DTC) P1874 TCC Stator Temp. Switch Circuit High
4L60E Code (DTC) P1875 4WD Low Switch Circuit
4L60E Code (DTC) P1884 TCC Enable/Shift Light Circuit
4L60E Code (DTC) P1886 Shift Timing Solenoid
4L60E Code (DTC) P1887 TCC Release Switch Circuit
4L60E Code (DTC) P1890 ECM Data Input Circuit
4L60E Code (DTC) P1891 Throttle Position Sensor PWM Signal Low
4L60E Code (DTC) P1892 Throttle Position Sensor PWM Signal High
4L60E Code (DTC) P1893 Engine Torque Signal Low Voltage
4L60E Code (DTC) P1894 Engine Torque Signal High Voltage
4L60E Code (DTC) P1895 TCM To ECM Torque Reduction Circuit
