DTC P0977 (CVT)

DTC P0977  : Shift Solenoid Valve "B" Circuit High

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC (CVT)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Start the engine in P position/mode, and wait for at least 10 seconds.

   -4. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0977 Shift Solenoid Valve "B" Circuit High

   Is DTC P0977 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   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. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

2. Determine possible failure area (SOL B line, others)

   -1. Do the shift solenoid valve B test .

   Does shift solenoid valve B work properly?

   YES 

   Go to step 3.

   NO 

   Go to step 4.

3. Open wire check (SOL B line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS.

   -3. Disconnect the following connector.

   PCM connector B (51P)

   -4. Disconnect the following connector.

   Solenoid wire harness 8P connector (engine wire harness side)

   Courtesy of HONDA, U.S.A., INC.

   -5. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Solenoid wire harness 8P connector (engine wire harness side): disconnected

   	PCM connector B (51P): disconnected
   Test point 1	Solenoid wire harness 8P connector (engine wire harness side) No. 4
   Test point 2	PCM connector B (51P) No. 12

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The SOL B wire is OK. Update the PCM if it does not have the latest software , or substitute a known-good PCM , then recheck. If DTC P0977 goes away and the PCM was updated, troubleshooting is complete. If DTC P0977 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the SOL B wire between the solenoid wire harness and the PCM.

4. Shift solenoid valve B check

   -1. Remove the valve body assembly .

   -2. Disconnect the following connector.

   Shift solenoid valve B 2P connector

   -3. Measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Solenoid wire harness 8P connector (valve body assembly side): disconnected
   	Shift solenoid valve B 2P connector: disconnected
   Test point 1	Shift solenoid valve B 2P connector No. 1
   Test point 2	Shift solenoid valve B 2P connector No. 2

   Courtesy of HONDA, U.S.A., INC.

   Is there 8.9-12.2 Ω?

   YES 

   Shift solenoid valve B is OK. Replace the solenoid wire harness .

   NO 

   Faulty shift solenoid valve B. Replace the valve body assembly .