DTC P0801 Reverse Inhibit Control Circuit

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Shift lock solenoid malfunction, open or short reverse inhibitor control circuit

TROUBLE SYMPTOM:

Gear is shifted from "N" range to "R" range during driving at 20 km/h (12MPH) or more.
Gear can not be shifted from "N" range to "R" range though the vehicle is parked.

WIRING DIAGRAM:

Fig 1: Shift Lock Solenoid Malfunction - Wiring Diagram

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK FUSE (NO. 32). Turn the ignition switch to OFF. Remove the fuse (No. 32).	Is the fuse (No. 32) blown out?	Replace the fuse (No. 32). If the replaced fuse has blown out easily, repair short circuit of harness between fuse (No. 32) and TCM.	Go to step 2.
2 CHECK OUTPUT SIGNAL OF TCM. Turn the ignition switch to ON. With the brake pedal depressed, shift the select lever to "D" range. Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 15 (+) - Chassis ground (-):	Is the voltage more than 10.5 V?	Go to step 3.	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND SHIFT LOCK SOLENOID. Turn the ignition switch to OFF. Disconnect the connector from TCM and shift lock solenoid. Measure the resistance of harness between TCM and shift lock solenoid connector. Connector & terminal (B55) No. 15 - (B116) No. 3:	Is the resistance less than 1 Ω?	Go to step 4.	Repair the open circuit of harness between TCM and shift lock solenoid connector.
4 CHECK HARNESS CONNECTOR BETWEEN TCM AND SHIFT LOCK SOLENOID. Measure the resistance of the harness between TCM and chassis ground. Connector & terminal (B55) No. 15 - Chassis ground:	Is the resistance more than 1 MΩ?	Go to step 5.	Repair the short circuit of harness between TCM and shift lock solenoid connector.
5 CHECK HARNESS BETWEEN SHIFT LOCK SOLENOID AND CHASSIS GROUND TERMINAL. Measure the resistance of harness between shift lock solenoid and chassis ground. Connector & terminal (B116) No. 4 - Chassis ground:	Is the resistance less than 1 Ω?	Go to step 6.	Repair the open circuit of harness between chassis ground and shift lock solenoid connector.
6 CHECK SHIFT LOCK SOLENOID. Measure the resistance of shift lock solenoid terminals. Connector & terminal (B116) No. 3 - No. 4:	Is the resistance between 7 - 21 Ω?	Go to step 7.	Replace the shift lock solenoid.
7 CHECK OUTPUT SIGNAL OF TCM. Lift-up the vehicle and support with rigid racks. NOTE: Raise all wheels off floor. Start the engine. Shift the select lever to "D" range and slowly increase vehicle speed to 20 km/h (12 MPH). NOTE: The speed difference between front and rear wheels may light the ABS warning light, but this does not indicate a malfunction. When AT control diagnosis is finished, perform the VDC memory clearance procedure of on-board diagnostics system. < Ref. to CLEAR MEMORY MODE , OPERATION, Subaru Select Monitor. > Measure the voltage between TCM and chassis ground. Connector & terminal (B55) No. 15 (+) - Chassis ground (-):	Is the voltage less than 1 V?	Even if the SPORT indicator light up, the circuit has returned to normal condition at this time. A temporary poor contact of connector or harness may be the cause. Repair the harness or connector in the reverse inhibitor control circuit.	Go to step 8.
8 CHECK POOR CONTACT.	Is there poor contact in the reverse inhibitor control circuit?	Repair the poor contact.	Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . >