DTC P2721 (KA/Kc)

DTC P2721:  Pressure Control Solenoid "D" Control Circuit High

General Description 

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

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

The CVT lock-up clutch control solenoid valve controls hydraulic pressure to the torque converter clutch. The CVT lock-up clutch control solenoid valve is controlled by duty cycle output. The spool in the CVT lock-up clutch 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 lock-up clutch 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 (CVT lock-up clutch control solenoid valve failure, PCM failure) and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type 

Execution	Continuous
Sequence	None
Duration	1 second or more
DTC Type	Two drive cycles, MIL on, A/T gear position indicator blinks

Enable Conditions 

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

[ ]: 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.

• PCM GND1 line open
• PCM GND2 line open
• CVT lock-up clutch 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 during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

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.