P2718: Pressure Control Solenoid D Control Circuit / Open

What it means

The control line to pressure control solenoid D is open. The solenoid cannot be driven.

At a glance

• Usually lights the check-engine light

How it works

The TCM drives pressure control solenoid D through an electrical control path so the valve can regulate transmission pressure. P2718 sets when that path is open and the module cannot drive the solenoid. An open coil or broken control wire can therefore prevent the commanded pressure adjustment.

Common causes

Most likely first.

1. Open solenoid coil
2. Broken control wire

Symptoms

• Check-engine or transmission warning light may be on
• Harsh, delayed, or slipping shifts
• Transmission may enter a reduced-function mode

How to diagnose it

1. Save freeze-frame data and check scan-tool data for solenoid D command and any circuit status indicating an open.
2. Inspect the transmission connector and wiring to solenoid D for a disconnected plug, broken wire, or damaged terminal.
3. Check solenoid D coil continuity and resistance against the manufacturer's specification.
4. If the coil passes, test continuity through the control wire from the transmission connector toward the TCM using the manufacturer's procedure.
5. Check the circuit connections and TCM output only after confirming the solenoid coil and wiring are intact.

Common fixes

• Reconnect and secure a disconnected solenoid D connector.
• Repair a broken control wire or damaged terminal in the solenoid D circuit.
• Replace solenoid D if its coil is open.
• Repair the TCM connection or output only if circuit testing confirms the fault is there.

Can I keep driving?

Avoid towing, hard acceleration, and extended driving because solenoid D may not be able to regulate pressure and shifts can worsen. If the vehicle slips, loses drive, or shifts into reduced-function mode, stop safely and arrange service.