What Does P0A16 Mean?
DTC P0A16 indicates the control module has detected an abnormally high voltage on the active engine mount "A" control circuit. This is consistent with an open circuit where no current is flowing through the actuator, or a short to battery voltage in the control wiring. The active vibration damping function of the engine mount is disabled, and the mount operates as a passive unit.
Common Causes
30%
Open circuit in the engine mount control wiring due to a broken wire or disconnected terminal
30%
Open coil in the active engine mount actuator (burned out)
20%
Short to battery voltage in the control circuit harness
15%
Corroded or backed-out connector pin preventing electrical contact
5%
Control module high-side driver fault holding the circuit high
Diagnostic Steps
1
Inspect the engine mount "A" electrical connector for backed-out pins, corrosion, or damage.
2
Measure the resistance of the mount actuator; an open-line (OL) reading confirms the actuator coil has failed.
3
Check continuity of the control wire from the control module to the mount connector to identify any breaks in the harness.
4
With the control module disconnected, measure for battery voltage on the control wire; presence of voltage indicates a short to B+.
5
Replace the active engine mount if the actuator is confirmed open; verify operation by commanding the mount through the scan tool and checking for current draw.
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
DTC P0A16 indicates the control module has detected an abnormally high voltage on the active engine mount "A" control circuit. This is consistent with an open circuit where no current is flowing through the actuator, or a short to battery voltage in the control wiring. The active vibration damping f...
The most common cause of P0A16 (Engine Mount "A" Control Circuit High) is: Open circuit in the engine mount control wiring due to a broken wire or disconnected terminal
Typical repair costs for P0A16 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of active engine mount control results in increased vibration at idle and during certain RPM ranges, which is primarily a comfort and NVH (noise, vibration, harshness) issue. There is no significant safety risk unless the mount is also physically deteriorated.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A16 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Mechanical
Difficulty
Type
Generic (SAE)
Recommended Tools
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