Pressure Control Solenoid "D" Control Circuit/Open
P2718 indicates the transmission control solenoid D circuit is open or has a control circuit fault, preventing proper pressure regulation in the transmission. This causes the transmission to enter limp mode and may result in harsh shifting, slipping, or overheating as the TCM loses precise control over hydraulic pressure.
What You Might Notice
- Check Engine Light illuminated
- Transmission shifts hard or bangs into gear
- Transmission slips during acceleration
- Increased fuel consumption
- Transmission overheating
Most Common Causes
- 1
Open or damaged solenoid D wiring
The electrical connector or wiring harness to solenoid D is disconnected, corroded, or broken, interrupting the control signal from the transmission control module.
- 2
Solenoid D coil failure
The solenoid D has internally failed or burned out, causing an open circuit that prevents current flow and solenoid activation.
- 3
Transmission control module fault
The TCM has a faulty output driver circuit for solenoid D control, unable to deliver proper signal voltage to the solenoid.
- 4
Corroded connector pins or poor grounds
The solenoid connector pins are corroded or the ground connection to the transmission is compromised, creating high resistance in the control circuit.
How to Diagnose It
- 1
Check Open or damaged solenoid D wiring — The electrical connector or wiring harness to solenoid D is disconnected, corroded, or broken, interrupting the control signal from the transmission control module.
- 2
Check Solenoid D coil failure — The solenoid D has internally failed or burned out, causing an open circuit that prevents current flow and solenoid activation.
- 3
Check Transmission control module fault — The TCM has a faulty output driver circuit for solenoid D control, unable to deliver proper signal voltage to the solenoid.
- 4
Check Corroded connector pins or poor grounds — The solenoid connector pins are corroded or the ground connection to the transmission is compromised, creating high resistance in the control circuit.
How to Fix It
- 1
Inspect and repair solenoid D wiring
Check the wiring harness and connector to solenoid D for damage, corrosion, or loose connections. Clean corroded pins with contact cleaner and ensure secure connections.
- 2
Replace solenoid D
Remove and replace the faulty pressure control solenoid D if it is burned out or internally failed and unable to hold continuity.
- 3
Check transmission ground connections
Verify all ground connections from the transmission case to the engine block and chassis are clean and tight, and repair any corroded grounds.
- 4
Test and reprogram TCM
Use a diagnostic scanner to perform solenoid circuit resistance testing and check for TCM fault codes. If TCM driver failure is confirmed, reprogram or replace the module.
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