Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the computer in your car has detected a problem with the electrical circuit that controls one of the engine mounts. An engine mount holds the engine in place, and if there's a problem, it might make the car shake or make funny noises.
The P0A16 code is triggered when the Powertrain Control Module (PCM) detects a high voltage condition in the control circuit for Engine Mount A.
Engine mounts are designed to secure the engine to the chassis of the vehicle while minimizing vibrations. Some modern vehicles use electronically controlled mounts to adjust stiffness based on driving conditions. The P0A16 code indicates that the control circuit for one of these mounts is experiencing a high voltage condition, which can be due to a wiring issue, a faulty sensor, or a malfunctioning engine mount actuator.
• Increased engine vibration
• Unusual noises from the engine compartment
• Check Engine Light illuminated
• Faulty engine mount actuator
• Damaged or corroded wiring/connectors
• Faulty PCM or control module
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the engine mount actuator for proper operation.
• Repair or replace damaged wiring/connectors.
• Replace the faulty engine mount actuator.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Toyota Prius
• Honda Accord Hybrid
• Chevrolet Volt
• Regularly inspect engine mounts and wiring.
• Avoid harsh driving conditions that may damage mounts.
• Perform routine vehicle maintenance.
Sensor Issue
• Have the vehicle inspected by a professional if the Check Engine Light is on.
• Avoid driving the vehicle aggressively until the issue is resolved.
Check with your vehicle manufacturer as engine mounts may be covered under powertrain warranty.
This code has been more common in vehicles with electronically controlled engine mounts introduced in hybrid and electric vehicles.
Moderate – While not immediately dangerous, prolonged driving with this issue can lead to increased wear on the engine and other components.
Driving with a faulty engine mount can lead to increased vibration and noise, which may affect vehicle handling and safety.
• Vehicle in park or neutral.
• Engine running at idle.
Engine mounts are located between the engine and the vehicle chassis, typically on the sides of the engine.
Q: Can I drive with a P0A16 code?
A: It's possible to drive, but it's not recommended as it can cause further damage.
Q: How do I clear a P0A16 code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is fixed to prevent recurrence.
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