Broken, disconnected, or corroded wiring or connector at the engine mount actuator; Failed engine mount actuator solenoid or vacuum control valve; Leaking or disconnected vacuum supply hose to the mount (on vacuum-operated systems); Defective engine mount itself, such as a ruptured internal diaphragm or fluid leak; Open or shorted circuit inside the mount control module or PCM driver; Blown fuse or relay supplying power to the mount control circuit

DTC codes / P0Axx · Hybrid propulsion / P0A14

P0A14Engine Mount Control Circuit/Open

Q: What does code P0A14 mean?

Engine Mount Control Circuit/Open. P0A14 indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the engine mount control circuit, which typically commands a vacuum or electronic actuator to soften or stiffen the mount. The PCM monitors the circuit for expected voltage or current and sets this code when the signal falls outside the normal range, often disabling active mount control.

P0A14 indicates that the powertrain control module (PCM) has detected an open circuit or excessive resistance in the engine mount control circuit, which typically commands a vacuum or electronic actuator to soften or stiffen the mount. The PCM monitors the circuit for expected voltage or current and sets this code when the signal falls outside the normal range, often disabling active mount control.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Increased vibration or harshness felt through the steering wheel, seat, or floorboards, especially at idle
Clunking or knocking noises from the engine bay during acceleration or deceleration
Roughness or shudder during cylinder deactivation or at specific engine speeds
In rare cases, the engine may feel less refined or exhibit excessive movement under load

Common causes, most likely first

Broken, disconnected, or corroded wiring or connector at the engine mount actuator
Failed engine mount actuator solenoid or vacuum control valve
Leaking or disconnected vacuum supply hose to the mount (on vacuum-operated systems)
Defective engine mount itself, such as a ruptured internal diaphragm or fluid leak
Open or shorted circuit inside the mount control module or PCM driver
Blown fuse or relay supplying power to the mount control circuit

How to diagnose and fix it

Inspect the engine mount actuator connector and wiring for damage, corrosion, or loose pins, and repair as needed
Check vacuum hoses and connections for leaks or disconnections if the system is vacuum-operated
Test the mount actuator solenoid with a multimeter for correct resistance and function, replacing if faulty
Verify power and ground signals at the actuator connector with a test light or multimeter while commanding the mount on with a scan tool
Inspect the engine mount itself for cracks, fluid leaks, or separation, and replace if defective
Check the fuse and relay for the mount control circuit and replace if blown or faulty
If all external components test good, diagnose the PCM driver circuit or consult a professional for advanced testing

Common Missteps When Diagnosing P0A14

A failed engine mount can set this code even when the electrical circuit is intact, so always inspect the mount for physical damage before replacing electrical parts.
On vacuum-operated mounts, a cracked vacuum hose or a leaking reservoir can cause the code without any electrical fault, so perform a vacuum test first.
The code may be intermittent and only set during specific driving conditions, such as cylinder deactivation or cold starts, so check for loose connections that test fine when stationary.
Some vehicles use the engine mount control circuit to enhance driving comfort, and a failure may not affect drivability, leading owners to ignore it until vibration becomes severe.
After repairs, the PCM may require a relearn or clearing of adaptive values before the code stays off, so always follow the manufacturer's reset procedure.

Can I keep driving with P0A14?

The vehicle is generally safe to drive with this code because it does not affect engine performance or safety systems, but increased vibration may accelerate wear on other components. Avoid aggressive acceleration or heavy loads until repaired, and address the issue promptly to prevent mount failure.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.