DTC P0977: Open in Shift Solenoid Valve B 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 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 P0977 is stored in the PCM, the transmission does not shift to any gear other than 1st, 2nd, or 5th gear because of the fail-safe function.

Turn the ignition switch to ON (II).
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 P0977 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 B and the PCM.
Turn the ignition switch to LOCK (0).
Disconnect the shift solenoid valve B connector.
Connect a jumper wire between shift solenoid valve B connector terminal No. 1 and body ground.

Fig 1: Connecting Jumper Wire Between Shift Solenoid Valve B Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine. With the brake pedal pressed, shift to D, and wait for at least 3 seconds, then move the shift lever back into P.
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0976 indicated?

YES -Go to step 12.

NO -Go to step 15.
Turn the ignition switch to LOCK (0).
Remove the jumper wire.
Check for continuity between shift solenoid valve B connector terminal No. 2 and body ground.

Fig 2: Checking For Continuity Between Shift Solenoid Valve B Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

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

NO -Repair an open in the wire between shift solenoid valve B and body ground (G101) (see ENGINE WIRE HARNESS (ENGINE SECTION) (D) ), or repair poor body ground (G101).
Turn the ignition switch to LOCK (0).
Remove the jumper wire.
Jump the SCS line with the HDS.
Disconnect PCM connector C (49P).
Check for continuity between PCM connector terminal C28 and shift solenoid valve B connector terminal No. 1.

Fig 3: Checking For Continuity Between PCM Connector Terminal C28 And Shift Solenoid Valve B Connector Terminal No. 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the PCM (see PCM REPLACEMENT ).

NO -Repair an open in the wire between PCM connector terminal C28 and shift solenoid valve B connector terminal No. 1.