Won’t start, How to Fix Ford Full Accessory Power Active

Full Accessory Power Active, Car won't start

To fix Ford full accessory power active, inspect the battery connections and terminals, check the alternator and ensure all accessories are turned off before starting your car. The “Full Accessory Power Active” alert indicates a potential battery problem preventing your car from starting. The cause of this issue can vary, but it always points to your vehicle’s electrical system or battery usage.

I have had my car for three months, but after a few miles yesterday, I started it this morning, and it didn’t start. Sync turns on, and I get the “Full Accessory Power Active” notice on the dashboard and a red battery icon on the bottom of that screen. The dealership said it was a battery problem and had drained, probably because I used the radio and air conditioning while the car was turned off.

Understanding the full power of the accessory and its functions would enable you to modify operations to prevent your car battery from draining. In this article, we will consider the potential causes of this problem and their fixes, along with their preventive measures.

Meaning of Full Accessory Power Active 

The “Full Accessory Power Active” warning on your car’s display tells you that your vehicle has enough power to run certain accessories, such as the radio, even when the car is turned off. However, it’s essential to turn it off when not needed to prevent the battery from draining.

Quick DIY (do It yourself) Fix for Full Accessory Power

You can try the following if you encounter the “Full Accessory Power Active” warning on your vehicle:

  • Turn off accessories.
  • Check battery connections.
  • Charge battery
  • Reset system
  • Check alternator
  • Inspect fuses to ensure they are not blown.

Reasons for A Car Not Starting with The Full Accessory Power on Display

There are several reasons why your car may not start with the full accessory power on display.

They include; 

Battery-related issues:

Low Battery Voltage: Leaving the car in “Full Accessory Power” mode for an extended period can drain the battery. Insufficient battery voltage may prevent the engine from cranking and starting.

A weak or faulty battery might not have enough power to start the engine, especially if it has been discharged or is reaching the end of its lifespan.

Ignition system problems:

Starter Motor Problems: The starter motor is responsible for cranking the engine. If it’s faulty or not functioning correctly, the engine won’t start.

Ignition System Failure: Issues with the ignition system, such as a failed ignition coil, spark plugs, or ignition module, can prevent the engine from starting.

Fuel-related issues:  

Insufficient fuel supply due to a clogged fuel filter, a failed fuel pump, or an empty fuel tank can prevent the engine from starting.

Electrical problems: 

Such as a blown fuse, faulty relays, or a malfunctioning engine control module (ECM), which can affect the engine’s ability to start.

Mechanical issues: 

Mechanical problems, such as a seized engine or timing belt failure, can also lead to the engine not starting.

More Fixes in Full Accessory Power-Active Car Won’t Start; Seeking Professional Help

  • Check Gear Shift Position: If your car has an automatic transmission, ensure the gear shift lever is in the “Park” position. Some vehicles have a safety interlock that prevents the engine from starting if the gearshift is not in the correct position.
  • Check the fuel level.
  • Test the battery.
  • Check battery connections.
  • Inspect the starter motor.
  • Verify ignition system components.
  • Check for faulty sensors.
  • It’s best to seek professional help or contact your vehicle manufacturer’s service center for further assistance if you find difficulties. They can use diagnostic tools to pinpoint the exact problem and provide a more precise solution.

Which Accessories Are Active? Full Accessory Power

The specific accessories that remain active when Full Accessory Power is engaged can vary from vehicle to vehicle, but some standard systems are typically kept on. These include the radio, the climate control system, the power windows, the power locks, the headlights, the interior lights, the navigation system, and the backup camera.

  • The Radio: It’s common for you to keep the radio on even after you have turned off the engine, allowing you to listen to your favorite music, news, or talk shows while you’re in your car. It’s a convenient way to pass the time while waiting for someone or something.
  • Power Windows: The Full Accessory Power feature lets you keep your power windows active even when the engine is off if you need to roll up the windows for security or climate control.
  • Lights (interior and headlights): In addition to keeping the power windows and radio on, it also keeps the interior lights and headlights on. This is convenient if you need to find something inside the car. It can also be helpful if you’re parked in a dark place and need to see where you’re going.
  • Automatic Climate Control: The Full Accessory Power feature can keep the automatic climate control system running even when the engine is turned off. This can be especially useful in hot or cold weather, as it allows the system to maintain a comfortable temperature inside the vehicle.

Differences Between Full Accessory Power and Engine Power

Engine Power: When the engine power is active, the vehicle’s engine is running, and the vehicle is in its fully operational state. In this mode, the engine provides the power necessary to move the vehicle, and all electrical systems, including accessories like lights and air conditioning, are powered by the engine itself.

Full Accessory Power: “Full accessory power” mode refers to a state where the engine is not running but the vehicle’s electrical accessories and systems are active. In this mode, the vehicle draws power from the battery to operate various electrical features, such as the lights, power windows, and air conditioning, without starting the engine.

 Engine PowerFull Accessory Power
Movement The vehicle can move and drive.The vehicle is stationary, and the accessories can be used without the engine running.
Battery UsageIt doesn’t use the battery’s power since the engine is turned on.Full accessory power mode can consume the vehicle’s battery power, and if left on for an extended period, it can potentially drain the battery, leading to difficulty starting the vehicle.
Power source In “engine power” mode, the engine generates the power needed to operate the vehicle and charge the battery through the alternator.In “full accessory power” mode, power is drawn solely from the battery, and the engine is not contributing to the electrical supply.
Engine OperationIn “engine power” mode, the engine is actively running to power the vehicle.In “Full accessory power” mode, the engine is off and the vehicle is not in motion.

Precautions and Safety Measures

When working with automotive electrical systems, it’s essential to take appropriate safety precautions to prevent accidents, injuries, and damage to the vehicle. Here are some safety tips to adhere to:

  • First, always disconnect the battery before working on any electrical systems to prevent electrical shocks and short circuits. Start by disconnecting the negative (-) terminal first and then the positive (+) terminal.
  • When handling electrical components, use insulated tools to reduce the risk of electrical shock. Avoid using metallic or conductive tools that could cause a short circuit.
  • Use a multimeter to check for live circuits before touching wires or components. This helps ensure there is no electrical current flowing through the system.
  • Keep electrical components and tools away from water and moisture to prevent short circuits and electrical damage.
  • If you are working with the vehicle’s battery or other electrical components that may emit gases, ensure you are in a well-ventilated area to avoid inhaling fumes.
  • Avoid creating sparks or using open flames when working with the battery, as batteries produce flammable gases.
  • Consult the vehicle’s service manual for accurate wiring diagrams and specific safety instructions when working on the electrical system.
  • Wear appropriate personal protective equipment (PPE), such as safety goggles and insulated gloves, to protect yourself from electrical hazards like shocks and injuries.
  • Make sure to keep the vehicle in park and apply the parking brake.
  • And lastly, if possible, work with a second person to help ensure safety.

If none of the solutions listed above solve your problem, your best bet is to take your vehicle to a dealership to check it out.



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