P2720

Code

Generic P — Powertrain

Pressure Control Solenoid D Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 37 EN: 82 RU: 35

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Page language: EN

Causes

Open or shorted wiring harness to Pressure Control Solenoid D
Corroded, loose, or damaged connector at the solenoid
Faulty pressure control solenoid D (coil open/short)
Blown fuse or faulty relay supplying the transmission control circuit
Poor battery/ground connection or high resistance in ground circuit
Faulty Transmission Control Module (TCM) or internal driver failure

Symptoms

Check Engine/Transmission warning lamp illuminated
Harsh, delayed, or missing gear shifts
Transmission may default to limp/limitation mode
Erratic line pressure or slipping under load
Stored transmission DTCs related to solenoids or pressure control

What to check

Visually inspect harness and connector at Pressure Control Solenoid D for corrosion, bent pins, and secure fit
Check fuses and relays related to transmission/TCM power and control
Backprobe solenoid connector; check for battery voltage on the supply pin with key ON (engine off)
With engine running or while commanding solenoid via scan tool, check for switching/PWM signal on the control pin
Measure solenoid coil resistance (engine off, connector disconnected) and compare to spec
Wiggle wiring while monitoring signal/voltage and observe for intermittent changes or code return

Signal parameters

Typical solenoid coil resistance (vehicle dependent): approx. 10–40 ohms (measure and compare to OEM spec)
Supply voltage: battery voltage (~12 V) present at the power feed pin with key ON (engine off)
Control signal: PWM switching from TCM; voltage measured may read as pulsed 0–12 V depending on duty cycle
Typical PWM frequency range (varies by manufacturer): ~20–250 Hz; duty cycle varies to control pressure

Diagnostic algorithm

Retrieve freeze frame and all transmission codes; note conditions when code set. Clear codes and road test to confirm persistence.
Perform visual inspection of solenoid connector and harness for damage, corrosion, or fluid contamination. Repair as needed.
Verify power and ground: backprobe connector with key ON (engine off). Supply pin should show battery voltage; ground should show near 0 V. Repair any open/poor connections.
Disconnect solenoid and measure coil resistance with an ohmmeter. If open or out of specified range, replace solenoid.
With connector disconnected, apply fused 12 V bench supply briefly to the solenoid coil to verify it actuates (observe for movement or change in resistance). Do not apply continuous direct battery power without proper precautions.
Reconnect and use a scan tool to command Solenoid D ON/OFF while monitoring control pin with a voltmeter or oscilloscope. Confirm PWM/duty changes when commanded. If no command signal but TCM requests it, suspect wiring between TCM and solenoid.
If control signal present and solenoid checks good, inspect wiring continuity between connector and TCM. Repair any shorts to ground or battery, opens, or high resistance.
If wiring and solenoid are good and connectors clean, suspect TCM output driver fault. Consider TCM replacement or repair after confirming with manufacturer procedures.
After repairs, clear codes and perform verification drive cycle to ensure code does not return.

Likely causes

Damaged connector or corroded terminals at the solenoid
Open or short in the harness between TCM and solenoid
Failed solenoid coil (open circuit or excessive resistance)
Blown fuse or poor ground supplying solenoid circuit
TCM output driver fault (if wiring and solenoid test good)

Fault status

⚠️ Status

Pressure Control Solenoid D Control Circuit Low — TCM detected lower-than-expected signal/voltage on the solenoid control circuit. Possible wiring fault, failed solenoid, blown fuse/relay, poor ground, or TCM driver failure.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours