P2718 — Pressure Control Solenoid “D” Control Circuit/Open #

Note: The code description may vary depending on the vehicle manufacturer.

• P2718 – Transmission Pressure Control Solenoid “D” Electrical (GM, Ford, Chrysler, Honda)
• P2718 – Solenoid Valve D Control Circuit Malfunction (Toyota, Lexus)
• P2718 – Line Pressure Solenoid “D” Circuit/Open (Nissan, Infiniti)

Code P2718 Summary #

The P2718 diagnostic trouble code (DTC) signals a problem with the Pressure Control Solenoid “D” or its associated electrical circuit within the automatic transmission. The solenoid is an electro-hydraulic valve that regulates fluid pressure for smooth gear changes and transmission protection. When the Engine Control Module (ECM) or Transmission Control Module (TCM) detects a break (open circuit) or abnormal signal in the control circuit for solenoid “D,” it triggers this code. This issue can cause noticeable shifting problems, and ignoring it may lead to further transmission damage. Understanding and addressing P2718 promptly helps maintain optimal vehicle performance and longevity.

Frequent Symptoms for Code P2718 #

When P2718 is present, the driver may experience a range of transmission-related symptoms. These issues often manifest as changes in the way the vehicle shifts gears or responds to throttle input. Sometimes, the check engine or transmission warning light will illuminate, signaling the need for further investigation.

• Harsh, delayed, or erratic shifting
• Transmission stuck in one gear (limp mode)
• Slipping gears or inability to shift
• Decreased fuel efficiency
• Check engine light or transmission warning light illuminated

Probable Causes of P2718 #

Several factors can lead to a P2718 code, most commonly involving the solenoid itself or its electrical connections. In rare cases, internal transmission or wiring harness issues may be to blame. Here are the most frequent causes, listed from most to least common:

1. Faulty or failed pressure control solenoid “D”
2. Open circuit, damaged, or corroded wiring/connectors at the solenoid
3. Blown or faulty transmission control module (TCM/ECM) fuse
4. Internal transmission failure affecting solenoid operation
5. TCM/ECM malfunction (rare)

Step-by-Step Diagnostic for P2718 #

A systematic approach is crucial for accurately diagnosing code P2718. Begin with the basics and move toward more complex tests only as needed. Here’s a proven workflow:

• Scan for DTCs: Use an OBD-II/EOBD scanner to confirm P2718 and check for related codes.
• Visual inspection: Inspect the transmission harness and solenoid D connector for damage, corrosion, or loose pins.
• Check fuses and relays: Locate and test the fuse(s) and relay(s) for the transmission control circuit.
• Wiring continuity test: Using a multimeter, verify continuity and resistance from the TCM/ECM to solenoid D.
• Solenoid resistance test: Measure the resistance across solenoid D terminals; compare with OEM specifications.
• Actuator test: If supported by your scan tool, command the solenoid on/off and listen/feel for response.
• Internal inspection: If all else checks out, internal transmission inspection may be required to rule out mechanical failure.

Possible Repairs for P2718 #

The appropriate repair for P2718 depends on the diagnostic findings. Always address the root cause to prevent further transmission issues.

• Replace faulty pressure control solenoid “D”
• Repair or replace damaged wiring, connectors, or terminals
• Replace blown or faulty TCM/ECM fuse(s)
• Repair internal transmission components (valve body, wiring harness) as needed
• In rare cases, replace or reprogram the TCM/ECM

Is It Safe to Drive with Code P2718? #

Limited. While some vehicles may remain drivable, continued operation with P2718 active is not recommended. This code often leads to poor shifting, limp mode, or further transmission damage if ignored. For your safety and to avoid costlier repairs, have the issue diagnosed and repaired as soon as possible.

Vehicles Most Commonly Affected by P2718 #

P2718 is seen across many brands using electronically controlled automatic transmissions, especially those with advanced solenoid packs. It is most frequently reported in:

• Toyota and Lexus (e.g., Camry, Corolla, Highlander, RX)
• Honda and Acura (e.g., Accord, Odyssey, MDX)
• GM (Chevrolet, GMC, Cadillac, Buick with 6-speed/8-speed automatics)
• Nissan and Infiniti (Altima, Maxima, Murano, QX60)
• Ford (Fusion, Escape, Edge, Explorer)
• Chrysler, Dodge, Jeep (Grand Cherokee, 300, Journey)

Common Mistakes & Best Practices for P2718 #

Even seasoned technicians can misdiagnose P2718. Avoiding these pitfalls can save time and money:

• Relying solely on code reading without thorough inspection of wiring/connectors
• Replacing the solenoid without checking for blown fuses or wiring faults
• Overlooking TCM/ECM updates or recalls from the OEM
• Skipping resistance or continuity tests
• Not clearing the code and performing a test drive after repairs

Quick FAQ for P2718 #

Still have questions? Here are quick answers to the most common concerns:

• Q: Will a transmission fluid change fix P2718?
  A: Not directly. While dirty or low fluid can contribute to shifting issues, P2718 specifically indicates an electrical fault. Address the solenoid circuit first.
• Q: Can I reset the code and keep driving?
  A: Resetting the code without repair may provide temporary relief, but the underlying issue will return. Prompt professional diagnosis is best.