DTC P2821 (16-20 6-Speed A/T)

DTC P2821  : Line Pressure Solenoid Valve A Stuck ON

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information - Refer to: How to Troubleshoot the A/T System .
• If DTC P2821 is stored in the PCM, engine torque is restricted because of the fail-safe function.

DTC (A/T)

1. ATF check

   - 1. Warm up the engine to normal operating temperature (the radiator fan comes on).

   - 2. Make sure that the transmission is filled to the proper level, and check for fluid leaks.

   - 3. Drain the ATF through a strainer. Inspect the strainer for metal debris or excessive clutch material.

   Does the strainer have metal debris or excessive clutch material?

   YES 

   Replace the transmission - Refer to: Automatic Transmission Removal and Installation (6-Speed A/T) .

   NO 

   Replace the ATF, then go to step 2. - Refer to: ATF Replacement (6-Speed A/T) .

2. Problem verification

   - 1. Raise the vehicle on a lift. Make sure it is securely supported, and allow all four wheels to rotate freely.

   - 2. Turn the vehicle to the ON mode.

   - 3. Clear the DTC with the HDS.

   - 4. Start the engine.

   - 5. With the brake pedal pressed, shift to D, then release the brake pedal.

   - 6. Monitoring the APP Sensor (%) with the HDS, press (2 % opened) and release (0 % opened) the accelerator pedal every 2 seconds. Then check the Line Pressure Sol VLV. A signal and the Line Pressure Switch signal with the HDS.

   Signal	Current conditions
   	Values	Unit
   APP Sensor (%)
   Line Pressure Sol VLV. A
   Line Pressure Switch

   Is the Line Pressure Switch ON when Line Pressure Sol VLV. A is ON, and OFF when Line Pressure Sol VLV. A is OFF?

   YES 

   Intermittent failure, the system is OK at this time.

   If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

   NO 

   The failure is duplicated. Faulty line pressure solenoid valve A. Replace the secondary valve body (line pressure solenoid valve A) .