DTC Advanced Diagnostics: P2721 (A/T) - Honda Accord CR/CT 2012-2017

DTC Advanced Diagnostics: P2721

DTC P2721:A/T Clutch Pressure Control Solenoid Valve D High Input (Engine Type: J35Y1)

General Description

A/T clutch pressure control solenoid valve D is used for clutch pressure control. A spool in A/T clutch pressure control solenoid valve D pushes the valve according to the duty cycle that is controlled by the powertrain control module (PCM) (The hydraulic pressure is proportional to the current). The PCM measures the current flowing through A/T clutch pressure control solenoid valve D, and uses feedback control to compensate for the difference between the actual current and the commanded one. If the measured current for the PCM output duty cycle is not within a specified range (circuit short or open), the PCM detects a malfunction 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
Battery voltage [BATTERY VOLTAGE]	11 V	–
No active DTCs set (prevents monitor from running)	P0962, P0963, P0973, P0974, P0979, P0980, P2720

[ ]: 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 0.6	High Input
13.7 - 27	More than 0.9	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.

	A/T clutch pressure control solenoid valve D internal circuit short
	PCM GND1 line open
	PCM GND2 line open
	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, the A/T gear position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC

The A/T gear position indicator comes off by pressing the engine start/stop button to select the OFF 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.