DTC P0971 (CVT)

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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 hydraulic pressure to the forward clutch and the reverse brake. 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 transmission control module (TCM) 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. The failure occurs by a short circuit or an intermittent short circuit. If the TCM internal driver IC detects its abnormal or the measured current is not equal to the duty cycle command, the TCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	1 second or more
DTC Type	One drive cycle, MIL on, Shift position indicator blinks

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage [Battery Voltage]	10.0 V	-

[ ]: HDS Parameter

Malfunction Threshold

One of the conditions is met for at least 1 second:

TCM internal driver IC detects its abnormal.
The measured current for the TCM's command value is as specified here.

Duty (%)	Current (A)	Failure mode
Less than 13.7	More than 0.57	High Input
13.7 - 27.4	More than 0.88	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
CVT clutch pressure control solenoid valve internal circuit short
TCM 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, the shift position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory.

Conditions for clearing the DTC

The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. 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.