DTC P0974: Open in Shift Solenoid Valve A Circuit

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

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION ).
This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
If DTC P0974 is stored in the PCM, the transmission does not shift to 2nd or 5th gear because of the fail-safe function.

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Clear the DTC with the HDS.
Start the engine. With the brake pedal pressed, shift to R, and wait for at least 1 second.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0974 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between shift solenoid valve A and the PCM.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Check for a blown No. 10 (10 A) fuse in the driver's under-dash fuse/relay box.
Is the No. 10 (10 A) fuse OK?

YES - Go to step 7.

NO - Repair a short to body ground in the wire between PCM connector terminal A1 and the driver's under-dash fuse/relay box.
Jump the SCS line with the HDS.
Disconnect PCM connectors A (49P).
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Measure the voltage between PCM connector terminals A1 and body ground.

Fig 1: Measuring Voltage Between PCM Connector Terminals A1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 11.

NO - Repair an open in the wire between PCM connector terminal A1 and the driver's under-dash fuse/relay box.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Disconnect the shift solenoid valve A connector.
Connect a jumper wire between shift solenoid valve A connector terminal No. 2 and body ground.

Fig 2: Identifying Jumper Wire Between Shift Solenoid Valve A Connector Terminal No. 2 And Body Ground Connection
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
Clear the DTC with the HDS.
Start the engine in P, and wait for at least 1 second.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0973 indicated?

YES - Go to step 18.

NO - Go to step 21.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Remove the jumper wire.
Check for continuity between shift solenoid valve A connector terminal No. 1 and body ground.

Fig 3: Checking Continuity Between Shift Solenoid Valve A Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Faulty shift solenoid valve A. Replace the secondary valve body (shift solenoid valve A) (see SECONDARY VALVE BODY REPLACEMENT ).

NO - Repair an open in the wire between shift solenoid valve A and body ground (G101) (see CONNECTOR TO FUSE/RELAY BOX INDEX ), or repair poor body ground (G101).
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
Remove the jumper wire.
Jump the SCS line with the HDS.
Disconnect PCM connector C (49P).
Check for continuity between PCM connector terminal C20 and shift solenoid valve A connector terminal No. 2.

Fig 4: Checking Continuity Between PCM Connector Terminal C20 And Shift Solenoid Valve A Connector Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Replace the PCM (see ECM/PCM REPLACEMENT ).

NO - Repair an open in the wire between PCM connector terminal C20 and shift solenoid valve A connector terminal No. 2.