DTC Troubleshooting: P0971 (CVT) - Honda Accord CR/CT 2012-2017

DTC Troubleshooting: P0971

DTC P0971: Pressure Control Solenoid "C" Control Circuit High

NOTE:

	Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and 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

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 or loose terminals between the CVT clutch pressure control solenoid valve and the PCM.?

CVT clutch pressure control solenoid valve check:

CVT clutch pressure control solenoid valve check

?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.

Measure the resistance between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector C (51P): disconnected
Test circuit	CPC LS
Test point 1	PCM connector C (51P) No. 5 (RED/BLK)
Test point 2	Body ground

Is there 4.7?5.9 ??


	YES

The CVT clutch pressure control solenoid valve is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then do the repair verification.


	NO

Go to step 3.

Shorted wire check (CPC LS line to power):

Shorted wire check (CPC LS line to power)

?1.

Disconnect the following connector.

Solenoid wire harness A 8P connector

?2.	Turn the vehicle to the ON mode.

?3.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Solenoid wire harness A 8P connector: disconnected
	PCM connector C (51P): disconnected
Test circuit	CPC LS
Test point 1	PCM connector C (51P) No. 5 (RED/BLK)
Test point 2	Body ground

Is there voltage?


	YES

Repair a short to power in the CPC LS wire between the solenoid wire harness A 8P connector and the PCM, then do the repair verification.


	NO

The CPC LS wire is not shorted to power. Go to step 4.

Open wire check (CPC LS line):

Open wire check (CPC LS line)

?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 A 8P connector: disconnected
	PCM connector C (51P): disconnected
Test circuit	CPC LS
Test point 1	Solenoid wire harness A 8P connector No. 1 (RED/BLK)
Test point 2	PCM connector C (51P) No. 5 (RED/BLK)

Is there continuity?


	YES

Go to step 5.


	NO

Repair an open in the CPC LS wire between the solenoid wire harness A 8P connector and the PCM, then do the repair verification.

Open wire check (GND1 line, GND2 line):

Open wire check (GND1 line, GND2 line)

?1.	Jump the SCS line with the HDS.

?2.

Disconnect the following connector.

PCM connector B (51P)

?3.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	PCM connector B (51P): disconnected
Test circuit	GND1
Test point 1	PCM connector B (51P) No. 11 (BLK)
Test point 2	Body ground

Test circuit	GND2
Test point 1	PCM connector B (51P) No. 12 (BLK)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 6.


	NO

Repair an open in the GND1 wire and/or GND2 wire between the PCM and body ground (G101), or repair poor body ground (G101), then do the repair verification.

CVT clutch pressure control solenoid valve internal resistance check:

CVT clutch pressure control solenoid valve internal resistance check

?1.	Remove the lower valve body.

?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	Lower valve body: removed
	CVT clutch pressure control solenoid valve 2P connector: disconnected
Test circuit	CPC+, GND
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 4.7?5.9 ??


	YES

Go to step 7.


	NO

Faulty CVT clutch pressure control solenoid valve. Replace the lower valve body, then do the repair verification.

Open wire check (GND line):

Open wire check (GND line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Lower valve body: removed
	CVT clutch pressure control solenoid valve 2P connector: disconnected
Test circuit	GND
Test point 1	CVT clutch pressure control solenoid valve 2P connector No. 1 (YEL)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 8.


	NO

Repair an open in the GND wire between the CVT clutch pressure control solenoid valve 2P connector and body ground (G152), or repair poor body ground (G152), then do the repair verification.

Open wire check (CPC+ line in solenoid wire harness B):

Open wire check (CPC+ line in solenoid wire harness B)

?1.

Check for continuity between test points 1 and 2.

Test condition	Lower valve body: removed
	Solenoid wire harness B 6P connector: disconnected
	CVT clutch pressure control solenoid valve 2P connector: disconnected
Test circuit	CPC+
Test point 1	Solenoid wire harness B 6P connector No. 5 (PNK)
Test point 2	CVT clutch pressure control solenoid valve 2P connector No. 2 (PNK)

Is there continuity?


	YES

Go to step 9.


	NO

Repair an open in the CPC+ wire between the CVT clutch pressure control solenoid valve 2P connector and the solenoid wire harness B 6P connector, then do the repair verification.

Open wire check (CPC+ line in solenoid wire harness A):

Open wire check (CPC+ line in solenoid wire harness A)

?1.	Remove the solenoid wire harness A.

?2.

Check for continuity between test points 1 and 2.

Test condition	Solenoid wire harness A 8P connector: disconnected
	Solenoid wire harness A 6P connector: disconnected
Test circuit	CPC+
Test point 1	Solenoid wire harness A 8P connector No. 1 (PNK)
Test point 2	Solenoid wire harness A 6P connector No. 5 (PNK)

Is there continuity?


	YES

Check for poor connections or loose terminals between the CVT clutch pressure control solenoid valve and the PCM, then go to step 1 and recheck.


	NO

Repair an open in the CPC+ wire between the solenoid wire harness A 6P connector and the solenoid wire harness A 8P connector, then do the repair verification.

Repair verification (OBD STATUS check):

?1.	Reconnect all connectors.

?2.	Exit the SCS mode with the HDS.

?3.	Turn the vehicle to the ON mode.

?4.	Clear the DTC with the HDS.

?5.	Start the engine, and wait for at least 1 second.

?6.

Monitor the OBD STATUS for P0971 in the DTCs MENU with the HDS.

DTC Description	OBD Status
P0971 Pressure Control Solenoid "C" Control Circuit High

Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?


	PASSED

Troubleshooting is complete. If the PCM was substituted, replace the original PCM. Check for other DTC after this troubleshooting. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.?


	FAILED

Troubleshooting is incomplete. Check for poor connections or loose terminals between the CVT clutch pressure control solenoid valve and the PCM, then go to step 1 and recheck. If the PCM was updated, substitute a known-good PCM, and check the OBD STATUS again.


	NOT COMPLETED

Repair verification is incomplete. Meet the test condition, and check the OBD STATUS again.