Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC2011CTS BASE, 4D WAGON, 3.6 D, AWDREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION - 6L45/6L50/6L90 - DTC P0150C THROUGH DTC P2764DTC P2534CIRCUIT/SYSTEM TESTING
2011 Cadillac CTS Base, 4D Wagon, 3.6 D, AWD
Circuit/System Testing
2011 Cadillac CTS Base, 4D Wagon, 3.6 D, AWDSECTION Circuit/System Testing
- Ignition OFF, disconnect the X1 16-way harness connector at the T12 automatic transmission assembly.
- Ignition OFF, test for less than 5 ohms on the vehicle harness connector X1 terminal 5 and ground at the transmission case.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates at connector X1 vehicle harness side and the following terminals:
- Terminal 4 and ground at the transmission case
- Terminal 12 and ground at the transmission case
- If the test lamp does not illuminate on any circuit, test the ignition or B+ circuit for a short to ground or an open/high resistance.
- If all circuits test normal, replace the Q8 control solenoid valve assembly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.