DTC Troubleshooting: P0971
DTC P0971: Pressure Control Solenoid "C" Control 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
P0971 Pressure Control Solenoid "C" Control 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, and wait for at least 1 second.

?4.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0971 Pressure Control Solenoid "C" Control Circuit High
      

Is DTC P0971 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 the CVT clutch pressure control solenoid valve 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 (CPCLS line, others):

Determine possible failure area (CPCLS line, others)
?1.
Do the CVT clutch pressure control solenoid valve test.

Does the CVT clutch pressure control solenoid valve work properly?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 5.
3.
Shorted wire check (CPCLS line to power):

Shorted wire check (CPCLS line to power)
?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)


?5.
Turn the vehicle to the ON mode.

?6.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON 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. 7
Test point 2
Body ground


Is there voltage?

     
YES
     
     
     
Repair a short to power in the CPCLS wire between the solenoid wire harness and the PCM.?
     
NO
     
     
     
The CPCLS wire is not shorted to power. Go to step 4.
4.
Shorted wire check (CPCLS line to ground):

Shorted wire check (CPCLS line to ground)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
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. 7
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the CPCLS wire between the solenoid wire harness and the PCM.?
     
NO
     
     
     
The CPCLS wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0971 goes away and the PCM was updated, troubleshooting is complete. If DTC P0971 goes away and the PCM was substituted, replace the original PCM.?
5.
CVT clutch pressure control solenoid valve check:

CVT clutch pressure control solenoid valve check
?1.
Remove the valve body assembly.

?2.
Disconnect the following connector.
CVT clutch pressure control solenoid valve 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
 
CVT clutch pressure control solenoid valve 2P connector: disconnected
Test point 1
CVT clutch pressure control solenoid valve 2P connector No. 1
Test point 2
CVT clutch pressure control solenoid valve 2P connector No. 2


Is there 4.6?6.3 ??

     
YES
     
     
     
The CVT clutch pressure control solenoid valve is OK. Replace the solenoid wire harness.?
     
NO
     
     
     
Faulty CVT clutch pressure control solenoid valve. Replace the valve body assembly.?