April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC P0C2D: Electric/Auxiliary Transmission Fluid Pump Control Module Feedback Signal Low: Notes

DTC detecting condition:

Detected when two consecutive driving cycles with fault occur.

Trouble symptom:

Auto Start Stop does not operate.

CAUTION:

Use the check board when measuring the TCM terminal voltage and resistance .
After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure . Ref. to AUTO START STOP (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

Wiring diagram:

CVT control system Ref. to WIRING SYSTEM>CVT CONTROL SYSTEM .

G13228223

Courtesy of SUBARU OF AMERICA, INC.

CHECK HARNESS BETWEEN TCM AND ELECTRIC OIL PUMP CONNECTOR .
1. Turn the ignition switch to OFF.
2. Disconnect the TCM connector.
3. Disconnect the connector of electric oil pump.
4. Measure the resistance between TCM connector and chassis ground.
  Connector & terminal
  
  (T10) No. 7 - Chassis ground:
Is the resistance 1 MΩ or more?

Yes: Go to 2.

No: Repair the short circuit to ground in the harness between TCM and electric oil pump connector.
CHECK ELECTRIC OIL PUMP OPERATION STATUS SIGNAL .
1. Connect the TCM connector.
2. Turn the ignition switch to ON.
3. Read the waveform of electric oil pump operation status signal using an oscilloscope.
  Connector & terminal
  
  (T10) No. 7 (+) - Chassis ground (-):
Is the duty ratio of electric oil pump operation status signal 100%? Ref. to AUTO START STOP (DIAGNOSTICS)>CONTROL MODULE I/O SIGNAL>WAVEFORM .

Yes: Replace the electric oil pump. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>ELECTRIC FLUID PUMP .

No: Check for poor contact of TCM connector. Replace the TCM if no fault is found. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>TRANSMISSION CONTROL MODULE (TCM) .