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

General Description

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. The failure occurs by a short circuit or an intermittent short circuit. If the current detection circuit detects an over current to the driver circuit for a specified duration when the driver circuit of the CVT lock-up clutch control solenoid valve is ON, 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
Two drive cycles, 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, P0741, P0746, P0777, P0780, P0792, P0793, P0796, P0797, P0962, P0963, P0966, P0967, P0970, P0971, P0976, P0977, P1898, P1899, P2715, P2720
[ ]: HDS Parameter

Malfunction Threshold
Current detection circuit detects an over current to the driver circuit for at least 1 second when the driver circuit of the CVT lock-up clutch control solenoid valve is ON.

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 lock-up clutch control solenoid valve LCCLS line short to ground
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.