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Home >> Cadillac >> 2017 >> CTS V >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 8L45 (M5N) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P171A-P171C: Transmission Fluid Pressure Accumulator Solenoid Valve Control Circuit >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform the Circuit/System Testing first.
  2. Ignition Off, connect the X175 harness connector.
  3. Remove the fluid pan from the T12 Automatic Transmission Assembly.
  4. Disconnect the harness connector at the B280 Automatic Transmission Accumulator Solenoid Valve.
  5. Test for 17-19 Ω at 20°C (68°F) between the control terminal 2 and the ignition terminal 1.
    • If not between 17-19 Ω 

      Replace the Auxiliary Fluid Accumulator Assembly.

    • If between 17-19 Ω 
  6. Test for infinite resistance on the B280 Automatic Transmission Accumulator Solenoid Valve as listed below:
    • Solenoid ignition terminal 1 and ground
    • Solenoid control terminal 2 and ground
    • If less than infinite resistance 

      Replace the Auxiliary Fluid Accumulator Assembly.

    • If infinite resistance 
  7. Verify the internal transmission wire harness does not have a short to ground, short to power or an open/high resistance in the circuits for the solenoid valve.
    • If a condition exist 

      Replace the automatic transmission wiring harness, electrical connector passage sleeve.

    • If a condition does not exist 
  8. All OK.
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