Pressure Control Solenoid "D" Control Circuit Low
P2720 indicates the transmission pressure control solenoid D circuit is receiving a low voltage signal, preventing proper transmission fluid pressure modulation. This causes the transmission to enter limp mode and may result in harsh shifting, slipping, or overheating as the PCM restricts operation to protect the transmission.
What You Might Notice
- Check Engine Light activated
- Transmission slips when shifting
- Transmission shifts hard or bangs into gear
- Increased fuel consumption
- Transmission overheats or enters limp mode
Most Common Causes
- 1
Pressure Control Solenoid D failure
The solenoid itself has failed electrically or mechanically, no longer responding to control signals. This is the most common cause of this code.
- 2
Wiring or connector issues
Corroded, loose, or damaged wiring and connectors between the PCM and solenoid prevent proper voltage from reaching the solenoid coil.
- 3
Low transmission fluid
Insufficient fluid level reduces system pressure and can trigger low voltage readings in the solenoid circuit as the system struggles to maintain pressure.
- 4
Transmission fluid contamination
Dirty or degraded transmission fluid can cause solenoid sticking or poor electrical conductivity, resulting in circuit low voltage faults.
How to Diagnose It
- 1
Check Pressure Control Solenoid D failure — The solenoid itself has failed electrically or mechanically, no longer responding to control signals. This is the most common cause of this code.
- 2
Check Wiring or connector issues — Corroded, loose, or damaged wiring and connectors between the PCM and solenoid prevent proper voltage from reaching the solenoid coil.
- 3
Check Low transmission fluid — Insufficient fluid level reduces system pressure and can trigger low voltage readings in the solenoid circuit as the system struggles to maintain pressure.
- 4
Check Transmission fluid contamination — Dirty or degraded transmission fluid can cause solenoid sticking or poor electrical conductivity, resulting in circuit low voltage faults.
How to Fix It
- 1
Replace Pressure Control Solenoid D
Remove the transmission pan or access cover, locate solenoid D, disconnect the electrical connector, remove the mounting bolts, and install a new OEM or quality replacement solenoid. Refill transmission fluid to proper level.
- 2
Inspect and repair wiring and connectors
Trace the wiring harness from the PCM to solenoid D, inspect for corrosion, loose pins, or damaged insulation. Clean connectors with electrical contact cleaner, repair any damaged wiring, and ensure connections are tight.
- 3
Check and top up transmission fluid
Using the transmission dipstick or sight glass, check the fluid level while the engine is running at operating temperature. Top up with the correct transmission fluid type for your vehicle if low.
- 4
Perform transmission fluid and filter service
If fluid is dark, burnt-smelling, or contaminated, drain and replace the transmission fluid and filter. This improves solenoid operation and circuit conductivity.
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