What this code means
P0974 may indicate that the ICM is seeing a mismatch between its command to turn shift solenoid valve A off and the return signal it receives.
What the vehicle may do
- The vehicle may have abnormal transmission operation.
- The driver may notice shifting or driveability behavior that feels different from normal.
Possible fault areas
- Possible shift solenoid valve A concern.
- Possible wiring, connector, or circuit concern between the solenoid area and the ICM.
- Possible ICM-related concern after the related circuit checks are normal.
Diagnostic path
Opening context
On this Honda Accord Hybrid, P0974 means the ICM may be commanding shift solenoid valve A OFF, but the return signal may not match what the module expects. The vehicle may have transmission behavior that feels abnormal, and the possible fault areas include the solenoid, the related wiring or connector path, or the ICM. Treat this like an electrical circuit diagnosis: prove the command-and-return path before calling the fault.
Set up the confirmation conditions
Before any pinpoint work, start with the basic troubleshooting approach for this system. Then turn the vehicle to READY TO DRIVE mode. Shift the transmission to P position/mode, and wait for at least 1 second. That gives you the correct starting condition before moving into the solenoid circuit checks.
Simulate the solenoid-side response
For shift solenoid valve A, there is no direct component-only test here, so the diagnosis is done through the related components. Disconnect the shift solenoid valve cover assembly connector, the 5P connector. Use the HDS to clear DTCs for the ICM, then turn the vehicle to OFF (LOCK) mode. Next, jump terminal No. 5 of that 5P connector to body ground with a jumper wire.
Read the result of the simulated test
With that jumper in place, run the companion confirmation check. For this test, the normal response is that the expected companion code is indicated. If that happens, the diagnostic path points to a problem with shift solenoid valve A. If the expected response does not happen, the path moves away from the solenoid itself and toward other related components.
Check the SH-A circuit for an open
Next, perform the SH-A circuit open-wire inspection. Disconnect the shift solenoid valve cover assembly 5P connector, then disconnect ICM connector P, the 36P connector. With IG Mode OFF, the normal condition for this check is: there is less than 1 Ω. If the result is abnormal, the problem is in the circuit.
Final isolation and takeaway
If the solenoid-side check and the circuit inspection both come back normal, the remaining fault area is the ICM. The takeaway is simple: use the jumper test to separate solenoid behavior from the rest of the circuit, then use the continuity check to prove the SH-A path before blaming the module. For more diagnostic training, visit stepdiagnostics.com.
Final check
P0974 is often approached as an electrical command-and-feedback diagnosis, where the circuit response is proven before the fault area is narrowed down.
For more guided automotive diagnostics, visit STEP Diagnostics.
