For a complete wiring diagram Refer to Section 8W.When Monitored:With the ignition on. Battery voltage greater than 10 volts.Set Condition:An open condition of the Transmission Control Output circuit is detected by the Totally Integrated Power Module (TIPM).Possible Causes(T16) TRANSMISSION CONTROL OUTPUT CIRCUIT OPENTOTALLY INTEGRATED POWER MODULE (TIPM)1. CHECK IF THE DTC IS ACTIVEIgnition on, engine not running.With the scan tool, read DTCs.Is the status Active for this DTC?YesGo to 2 NoGo to 42. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR AN OPEN

Turn the ignition off to the lock position.Disconnect the PCM C4 harness connector and install Miller tool #8815.Disconnect the Transmission Solenoid harness connector.Disconnect the Line Pressure Sensor harness connector.Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller tool #8815 to perform diagnosis.Ignition on, engine not running.Using the scan tool under the TIPM Actuators, actuate the Transmission.Using a 12-volt test light connected to ground, check the (T16) Transmission Control Output circuits.The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.Does the test light illuminate brightly?YesGo To 3NoRepair the (T16) Transmission Control Output circuit for an open.Perform 545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)3. TOTALLY INTEGRATED POWER MODULEUsing the schematics as a guide, inspect the wire harness and connectors. Check the TIPM harness connector terminals for corrosion, damage, or terminal push out.Pay particular attention to all power and ground circuits.Were any problems found?YesRepair as necessary.Perform 545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)NoReplace the Totally Integrated Power Module per Service Information.Perform 545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)4. INTERMITTENT WIRING AND CONNECTORSThe conditions necessary to set this DTC are not present at this time.Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors.Look for the data to change or for the DTC to reset during the wiggle test.Were any problems found?YesRepair as necessary.Perform 545RFE TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 45RFE/545RFE - STANDARD PROCEDURE)NoTest complete.