P2718 indicates that the control circuit for transmission pressure control solenoid D is open, meaning the transmission control module (TCM) cannot complete the electrical path to the solenoid. This prevents proper hydraulic pressure regulation, leading to shift quality issues.
A broken wire, chafed insulation, or damaged harness segment interrupts the circuit between the TCM and solenoid D.
Oxidation, moisture ingress, or a poorly seated terminal creates high resistance or an open connection.
The solenoid’s winding can open electrically, preventing current flow even when the circuit wiring is intact.
The TCM’s internal driver transistor may be damaged, leaving the circuit open despite good wiring and solenoid.
A control‑module communication error could prevent the TCM from commanding solenoid D, but this is uncommon.
No. The code points to an open circuit in the solenoid D control path; the PCM/ECM is rarely the cause. Most failures are wiring, connector, or solenoid related.
Driving with an open solenoid D circuit can cause harsh shifts, slipping, and potential transmission damage. Repair should be performed as soon as practical.
In most transmissions solenoid D can be removed and replaced without replacing the entire valve body, but service procedures vary by vehicle.
Clearing the code only resets the warning light; the underlying open circuit remains and the code will return until the fault is corrected.