DTC P0971

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

General Description 

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

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

The CVT clutch pressure control solenoid valve controls and optimizes clutch pressure (hydraulic pressure) for various driving conditions. The CVT clutch pressure control solenoid valve is controlled by duty cycle output. The spool in the CVT clutch pressure control solenoid valve moves the valve according to the current, and produces hydraulic pressure in proportion to the current. The powertrain control module (PCM) measures the current that passes through the CVT clutch pressure control solenoid valve and uses feedback control to compensate for the difference between the measured current and the commanded one. If the measured current is not equal to the duty cycle command, the PCM detects a malfunction (open, short to ground) and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status 

Execution	Continuous
Sequence	None
Duration	1 second or more
DTC Type	One drive cycle, MIL on, A/T gear position indicator blinks
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions 

Condition	Minimum	Maximum
12 volt battery voltage [Battery Voltage]	10.0 V	-
No active DTCs set (prevents monitor from running)	P0716, P0717, P0746, P0777, P0780, P0792, P0793, P0796, P0962, P0963, P0966, P0967, P0970, P1898, P1899

[ ]: HDS Parameter

Malfunction Threshold 

The measured current for the PCM's command value is as specified here for at least 1 second.

Duty (%)	Current (A)	Failure mode
Less than 13.7	More than 0.58	High Input
13.7 - 21.1	More than 0.89	High Input

Possible Cause 

NOTE:  The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

• CVT clutch pressure control solenoid valve CPCLS line short to power
• CVT clutch pressure control solenoid valve CPCLS line short to ground
• CVT clutch pressure control solenoid valve internal circuit short
• PCM internal circuit failure

Confirmation Procedure 

Operating Condition 

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

With the HDS 

None.

Diagnosis Details 

Conditions for setting the DTC 

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC 

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.