Solenoid valve for lock-up 3 disengage - Short circuit to ground
Check the cable harness on the solenoid valve actuator box and on the G6 ECU. Check the wire between G6 ECU and the solenoid valve actuator box. The fault can also be inside the solenoid valve actuator box.
What you'll see
No driver-visible symptom recorded.
System reaction
The system will not be able to shift the lockup 3 gear sleeve. If the lockup 3 gear sleeve is engaged, it will be possible to continue in the current gear. If the lockup 3 gear sleeve is not engaged, no gears will be available.
Diagnostic depth
Solenoid valve is grounded on high voltage side. If the lockup 3 engage solenoid valve also has fault code "shorted to low source" the fault can also be on the lockup 3 engage solenoid valve.
Harness, connectors or component is connected to low source.