DTC P2821: Line Pressure Solenoid Valve A Stuck ON
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review the GENERAL TROUBLESHOOTING INFORMATION
- If DTC P2821 is stored in the PCM, engine torque is restricted because of the fail-safe function.
- Warm up the engine to normal operating temperature (the radiator fan comes on).
- Make sure that the transmission is filled to the proper level, and check for fluid leaks.
- Drain the ATF (see
step 5 under ATF Replacement
) 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.
NO -Replace the ATF (see step 8 under ATF Replacement ), then go to step 4.
- Raise the vehicle on a lift, make sure it is securely supported, and allow all four wheels to rotate freely.
- Turn the ignition switch to ON (II).
- Clear the DTC with the HDS.
- Start the engine. With the brake pedal pressed, shift to D, then release the brake pedal.
- Monitoring the APP Sensor (%) with the HDS in the A/T Data List, 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 in the A/T Data List.
Is the Line Pressure Switch ON when Line Pressure Sol VLV. A is ON, and is the Line Pressure Switch OFF when Line Pressure Sol VLV. A is OFF?
YES -Intermittent failure, the system is OK at this time.
NO -Faulty line pressure solenoid valve A. Replace the secondary valve body (line pressure solenoid valve A) (see SECONDARY VALVE BODY REPLACEMENT ).