P0A14 — Engine Mount “A” Control Circuit/Open #

The wording of this code may vary by manufacturer. Below are known variations of the code description:

• Toyota/Lexus/Scion: “Engine Mount ‘A’ Control Circuit/Open”
• Honda/Acura: “Active Engine Mount ‘A’ Control Circuit/Open”
• Nissan/Infiniti: “Engine Mount Actuator ‘A’ Circuit/Open”
• GM/Chevrolet: “Engine Mount ‘A’ Control Circuit Fault/Open”

Code summary for P0A14 #

P0A14 is a generic powertrain diagnostic trouble code (DTC) indicating that the engine mount “A” control circuit has an open condition. In automotive terms, an “open” in a circuit means there’s a break somewhere—either in the wiring, connector, or the internal circuitry of the engine mount actuator itself. Modern vehicles, especially hybrids and some high-end models, feature active engine mounts equipped with electronic control to reduce vibration and improve ride comfort. P0A14 signals a communication breakdown between the Engine Control Module (ECM) and the designated “A” engine mount. This issue should not be ignored, as it can lead to increased vibrations and potentially mask more serious engine or drivetrain problems.

Common symptoms for code P0A14 #

When P0A14 is present, you may notice changes in your vehicle’s behavior. While the engine and transmission may continue to function, the comfort and smoothness typically provided by active engine mounts can be compromised. Watch out for the following:

• Increased engine vibration, especially at idle or low speeds
• Unusual noises from the engine bay, such as buzzing or knocking
• Check Engine Light (CEL) illuminated on the dashboard
• Reduced ride comfort, particularly when accelerating or decelerating
• Possible vibration felt through the steering wheel or floorboard

Most likely causes for code P0A14 #

Several issues can trigger the P0A14 code. They are ranked below from most to least common, based on typical repair data and manufacturer bulletins:

1. Faulty active engine mount “A” (internal open circuit or actuator failure)
2. Damaged or corroded wiring/connectors in the mount control circuit
3. Blown fuse or relay associated with the engine mount control system
4. Faulty Engine Control Module (ECM) (rare, but possible)
5. Poor ground connection related to the mount or the ECM

Step-by-step diagnosis for P0A14 #

Diagnosing P0A14 requires patience and a systematic approach. Here’s how a professional technician or a skilled DIYer would proceed:

• Verify the code and freeze frame data with a scan tool.
• Inspect the engine mount “A” and its electrical connector for obvious damage, corrosion, or loose connections.
• Check related fuses and relays in the engine bay fuse box using a multimeter.
• Continuity test the wiring harness between the ECM and the mount actuator for breaks or shorts. Wiggle the harness to catch intermittent faults.
• Check for proper ground at the mount and ECM. Clean and tighten as needed.
• Bench test or replace the engine mount “A” actuator if the wiring and power are confirmed good.
• Test the ECM output (only after all other steps), as ECM failure is rare and diagnosis may require OEM-level tools.

Possible repairs for code P0A14 #

Once the root cause is identified, repairs will be targeted to restore the circuit’s integrity and the mount’s operation. Common solutions include:

• Replacing the faulty engine mount “A” (most common fix)
• Repairing or replacing damaged wiring or connectors in the control circuit
• Replacing a blown fuse or faulty relay serving the mount circuit
• Cleaning and securing ground connections
• Replacing the ECM (only if strictly necessary and verified by advanced diagnostics)

Is it safe to drive with code P0A14? #

Limited — You can generally continue to drive with P0A14 present, but it is not advisable for long periods. The main risk is increased engine vibration, which could lead to discomfort, fatigue, and in rare cases, accelerated wear of other components. More critically, persistent vibration can mask the onset of more serious engine or transmission issues. Schedule a repair as soon as practical to restore ride quality and avoid compounding problems.

Vehicles most commonly affected by code P0A14 #

P0A14 is most frequently seen on vehicles equipped with electronically controlled (active) engine mounts. This includes many hybrids, luxury sedans, and some modern SUVs. The most commonly reported models include:

• Toyota Prius, Camry Hybrid, Avalon Hybrid
• Honda Accord Hybrid, Civic Hybrid
• Lexus ES300h, RX450h
• Nissan Altima Hybrid, Infiniti Q50 Hybrid
• Chevrolet Malibu Hybrid

Common mistakes & best practices for P0A14 #

When troubleshooting P0A14, certain errors are frequently made—often costing time and money. Here’s what to watch out for and how to avoid common pitfalls:

• Replacing the engine mount without checking wiring or fuses first
• Overlooking corroded connectors—a quick clean and dielectric grease can save a costly replacement
• Ignoring ground connections—a loose or rusty ground can mimic a failed mount
• Not using an OEM scan tool for advanced testing—generic tools may miss intermittent faults
• Skipping a road test after repairs—always verify the fix by clearing the code and confirming normal operation

Quick FAQ for code P0A14 #

Still have questions about P0A14? Here are the most frequent concerns:

• Q: Can a bad engine mount cause other problems?
  A: Yes. Besides vibration, a failed active mount can stress adjacent mounts, hoses, and wiring, potentially leading to further issues if left unaddressed.
• Q: Is it expensive to fix P0A14?
  A: Repair costs vary. If it’s just a fuse or wire issue, the fix can be inexpensive. Active engine mounts themselves can be costly (especially OEM parts), but labor is typically straightforward.