Check Shift Indicator

WARNING: This page is about a different car, the 2021 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Diagnosis:

CAN communication is abnormal with the combination meter.
Combination meter malfunction

Trouble symptom:

Shift indicator does not display or remains displayed.
Shift indicator display does not change.

CHECK DTC .
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

Is DTC U0155 or U0423 displayed?

Yes: Perform the self-diagnosis of combination meter.

No: Go to 2.
CHECK DTC .
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

Are DTCs other than U0155 and U0423 displayed?

Yes: Perform the diagnosis according to the DTC. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

No: Go to 3.
CHECK COMBINATION METER .
Read the DTC of [Combination Meter] using the Subaru Select Monitor. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

Are any DTCs displayed?

Yes: Perform the diagnosis according to the DTC. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

No: Go to 4.
CHECK TCM .
1. Operate the + side of the paddle shift switch.
2. Using the Subaru Select Monitor, read data of [Up Switch] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .
Does the display switch between [ON] and [OFF] according to the operation?

Yes: Go to 5.

No: Check for poor contact between TCM and paddle shift UP switch, and repair the defective part.
CHECK TCM .
1. Operate the - side of the paddle shift switch.
2. Using the Subaru Select Monitor, read data of [Down Switch] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .
Does the display switch between [ON] and [OFF] according to the operation?

Yes: Go to 6.

No: Check for poor contact between TCM and paddle shift down switch, and repair the defective part.
CHECK TCM .
1. Turn the ignition switch OFF, then turn it ON again.
2. Shift the select lever to manual mode.
3. Using the Subaru Select Monitor, read data of [Shift Step in Manual Mode] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .
Is "1" displayed?

Yes: Go to 7.

No: Perform the diagnosis according to DTC P0951. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0951 AUTO SHIFT MANUAL CONTROL CIRCUIT RANGE/PERFORMANCE .
CHECK TCM .
1. Shift up the select lever.
2. Using the Subaru Select Monitor, read data of [Shift Step in Manual Mode] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .
Is "2" displayed?

Yes: Current condition is normal.

No: Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>TRANSMISSION CONTROL MODULE (TCM) .