There may be a no start condition on some 2025-2026 Equinox and Terrain models. In addition, the starter may click and there may be several DTCs set in the Engine Control Module (ECM).
These conditions may be caused by the 12V battery, the battery connections or the G111 and G112 grounds. (Fig. 6, #2 – G111; #1 – G112)
Fig. 6
Begin diagnosis by verifying the 12V battery state of charge. If the battery is good, check the negative battery cable extension.
Perform a voltage drop test from the battery negative terminal to the transmission case. If the voltage drop is 100mV or more, continue with diagnosis. If it is less than 100mV, diagnose any current DTCs following the appropriate Service Information.
Next, check that the G111 and G112 grounds are properly torqued and in good condition.
G111 – Check that the stud is free of paint and the nut contact surface is clean. Also confirm the ground cable terminal is clean and free of debris, heat shrink glue and arcing residue. Clean the terminal, nut and stud as needed. Torque the G111 nut to 22 Nm. (Fig. 7)
Fig. 7
G112 – Check that the bolt is clean with no signs of debris or arcing residue. Also confirm the ground cable terminal is clean and free of debris, heat shrink glue and arcing residue. Clean the terminal, bolt and transmission surface as needed. Torque the G112 bolt to 9 Nm (VT40 transmission, RPO MRQ) or 22 Nm (8T45 transmission, RPO MGH). (Fig. 8)
Fig. 8
After inspecting the grounds, clear all DTCs and road test the vehicle to check for proper operation.
For additional information, refer to Bulletin #25-NA-143.
– Thanks to Rob Smith
