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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 >> Circuit/System Description

Circuit/System Description

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.

The automatic transmission auxiliary fluid accumulator is used to supply transmission fluid line pressure to the appropriate clutches during an auto start event. The accumulator is mounted to the transmission upper valve body assembly. Attached to the accumulator is a normally closed ON/OFF solenoid. When the ignition is ON, the engine control ignition relay supplies 12 V to the accumulator solenoid. To complete the circuit, the engine control module (ECM) supplies a control circuit to the accumulator solenoid. When the ECM requests an auto start event, the solenoid is commanded ON, allowing pressurized oil to exit the accumulator to apply the clutches.

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