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

1.
Problem verification:

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):

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):

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 C (51P)

?4.
Disconnect the following connector.
Solenoid wire harness 8P connector (engine wire harness side)


?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 C (51P): disconnected
Test point 1
Solenoid wire harness 8P connector (engine wire harness side) No. 4
Test point 2
PCM connector C (51P) No. 19


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:

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


Is there 8.9?12.2 ??

     
YES
     
     
     
Shift solenoid valve B is OK. Replace the solenoid wire harness.?
     
NO
     
     
     
Faulty shift solenoid valve B. Replace the valve body assembly.?