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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 P182E OR P1915CIRCUIT/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
    NOTE: You must perform Circuit/System Verification first.
  1. Ignition OFF, remove the automatic transmission fluid pan. Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement .
  2. Disconnect the IMS connector at the Q8 control solenoid valve assembly.
    3. NOTE: Under certain driving conditions, DTC P182E could set due to an intermittent low voltage fault on the P/N signal circuit, before conditions for setting DTC P0851 are met.
  3. Ignition ON, verify the scan tool engine control module (ECM) P/N switch displays In Gear.
    • If not the specified value, test the P/N signal circuit for a short to ground. If the circuit tests normal, replace the engine control module.
  4. Verify the scan tool IMS A/B/C/P parameter displays HI for all four signal circuits.
    • If not the specified value, replace the Q8 control solenoid valve assembly.
  5. Connect a 3A fused jumper wire between each transmission range signal circuit terminals listed below and the IMS ground circuit. The appropriate scan tool IMS A/B/C/P parameter should display LOW when the terminal is connected to the IMS ground circuit.
    • Switch Signal A: terminal E to terminal A
    • Switch Signal B: terminal D to terminal A
    • Switch Signal C: terminal C to terminal A
    • Switch Signal P: terminal P to terminal A
    • If not the specified value, replace the Q8 control solenoid valve assembly.
  6. If all circuits test normal, test or replace the IMS.
RENDER: 1.0x

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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.