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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (Automatic Transmission - 8L45 (M5N) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P171A-P171C >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: B280 Automatic Transmission Accumulator Solenoid Valve
    NOTE:

    The component's temperature should be 19 to 21°C (66 to 70°F) while testing.

  3. Test for 17 to 19 ohms between the test points: Control circuit terminal 1 & Control circuit terminal 2
    • If not between 17 and 19 ohms 

      Replace the component: B280 Automatic Transmission Accumulator Solenoid Valve

    • Go to next step: If between 17 and 19 ohms 
  4. Test for infinite resistance between the test points: Each terminal of the component & The component's housing
    • If less than infinite resistance 

      Replace the component: B280 Automatic Transmission Accumulator Solenoid Valve

    • Go to next step: If infinite resistance 
  5. All OK.
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