Why is My Tesla Only Charging At 16 Amps

Did you experience plugging in your Tesla charger and leaving it for some time to charge? It’s so frustrating to see that the charging is only 50%.

Most of the time, the charging begins at 32A, but for some reason, it is reduced to 16A. Do you wonder why your Tesla is only charging at 16A?

The charging infrastructure problem, Weak Tesla battery, and old Software version in Tesla are the leading causes to reduce the charging speed.

Keep reading to know how I found various causes and solutions to maintain a steady charging speed at the pre-selected rate in my Tesla.

Why Your Tesla is Only Charging at 16 AMPs?

Why Is My Tesla Only Charging At 16 Amps

Home chargers are a super convenient way to charge your Tesla. However, it’s essential that your garage wiring and breaker are compatible with the charger. 

Here are the reasons why Tesla is charging at 16A.

1. Overheated Adapter

Several times, you notice that you plugged in your charger at 32A while the charging outlet is compatible and the breaker, too, is 50V. But still, it charges at 16A, and the charger plug is overheated. 

The max voltage drops due to the fault in the wiring, and if you notice that the adapter is too hot. On the other hand, The adapters may have very little wiring wrapped around the surface that comes in contact with the Tesla charger’s plug. 

As a result, it reduces the current flow, and you get 16A instead of 32A volts flowing in the circuit. So, the adapter gets hot in that process and lowers the voltage to minimize the damage to electrical components in the circuit.

2. The Adapter Is Not Fully Inserted in UMC

The charging volts are reduced when you do not connect the adapter with the universal mobile connector.

Mobile connectors are plugged into the Tesla charger for extended reach. However, when you do not connect it properly, it reduces the charging rate.

3. Problematic Wires Connecting Breaker & Charger Outlet

Most garages have old wiring and electrical panels that do not supply the electrical current at the specified rate. 

While replacing the whole wiring in your house is difficult, you must check the wires connecting the Tesla breaker and outlet if you want to spare yourself from the pain of charging the Tesla at a lower voltage than specified.

4. Loose connector

If you are experiencing an overheating adapter and a voltage drop, that happens when there are loose connectors in the circuit.

That’s a dangerous situation, and Tesla automatically reduces the voltage to prevent the inconsistent flow of electricity. Hence minimizing the danger of short circuits. The loose connector can result from an old wiring system or pest and rodent movement loose the connections.

5. Non Dedicated Circuit

You may have other high-powered appliances on the same circuit as your Tesla charger. Tesla must be charged through a dedicated circuit connecting a 240V circuit that connects the electrical circuit panel to the Tesla charger directly.

If you have other appliances in the circuit, remember there is a lot of juice flowing through the circuit. 

To reduce the risk of burning the wires, the incredibly well-designed Tesla charger adjusts the charging at a lower voltage to maintain charging without burning down your house.

6. Faulty Outlet 

The Tesla charging outlet has to be compatible with the charger. You have to inspect the charging outlet for any faults. If you notice that the charging outlet has melted at some point, you need to replace it. 

7. Loose And Old Wiring

That usually happens in the old houses where the wiring is old and corroded. In addition, the old wiring is loose at some points, and to prevent the risk of short circuits, the Tesla charger reduces the charging and may ultimately stop charging.

How to Fix Your Tesla That Only Charges At 16 Amps?

Here is how you can start charging your Tesla at 32 Amps.

1. Reset Wall Charger

Resetting the charger will resume the charging speed.

  • To perform a reset, remove the charger from the Tesla charging port.
  • Turn off the breaker for 10 minutes.
  • Then, turn it back on after 10 minutes and connect with the Tesla. At this time, the circuit will drain the electricity. That’s an effective way to remove the fault from the circuit of your wall charger.

2. Reschedule The Charging

When you charge the Tesla from the home charger, which reduces the charging to 16, you have to change the Tesla settings to bring the charging back to 32A.

  • First, you must reschedule the charging time in your Tesla app.
  • You should reschedule the charging time for the Tesla touchscreen, too. 
  • Afterwards, recharge your Tesla at any site other than your home charging port.
  • Preferably recharge your Tesla at the supercharger.
  • That would recharge Tesla at a higher voltage and make the car ‘relearn’ about charging at a higher voltage.
  • Then, reconnect the car with the home charger to ensure it starts charging at 32 Amps.

3. Tightly Connect The Adapter

Most Tesla experts found that the wall charger gets loose from the point where the adapter contacts the Tesla wall charger. 

You don’t notice such minor things, but that is why Tesla is charging at 16 Amps.

  • If you have hung the Tesla wall charger in a Holster, you must carefully unplug the power source adapter.
  • Now, detach the adapter from the charger.
  • Then, reconnect the adapter with the charger by plugging it back in with full force so that it completely flushes with the side of the mobile charger.

4. Remove Slack In Cord

One very common hack to bring the Tesla charging to 32 Amp is removing the slack on the charger. 

When the Tesla begins charging at 16A and an error message pops up on your screen, you need to remove the slack in the cord, and it will start charging at 32A.

5. Replace The Charging Outlet

Tesla recommends installing a NEMA 14-50 charging outlet at 32A. There are many charging outlets in the market, but make sure to buy the one compatible with the home charger to get maximum benefit.

  • You cannot attach the low amp charging outlet to the Tesla charger. 
  • So change the Low amp Charging outlet by turning off the breaker at the breaker box.
  • Using the appropriate screwdrivers and removing the screws and outlet plate.
  • You will notice the incompatible charging outlet is melted due to charging overload.
  • Now, remove the wires from the terminals by unscrewing them.
  • Rub the ends of the cables with the sandpaper to remove the rust.
  • Wrap the wires around the terminals of the new outlet and put screws on the faceplate.

6. Change the Wiring Between the Breaker and the Charging Outlet

You must carefully inspect the wiring fault between the Tesla home charging outlet and the breaker. 

It is highly recommended that you seek the help of a professional electrician to trace the short circuit earth fault in the wiring. 

If there is a burnt or exposed wire, you must replace it with a new one to resume the 32A charging.

7. Install a Subpanel to Your Electrical Panel

It is unnecessary, but your Tesla charging port should be on a separate electrical sub-panel. Other electrical panels have high-powered appliances, which will overload the circuit, causing the wiring to overheat.

 It will ultimately reduce the available power. Finally, the Tesla charger will receive less power to charge.

So, it’s best to install a subpanel with a Tesla charger at home to avoid such problems.

8. Change the Charger 

You might have been using the Tesla charger for quite some time, and it’s taking longer to charge because it’s weaker.

The charger warranty lasts 12 months, but Tesla recommends replacing the charger with a new one after four years if the faulty charger interrupts the full power supply.

9. Update Software

The firmware bug can reduce the charging speed, and you want to update the software to the latest version immediately. 

  • You need to go to the ‘Software’ to check for any available updates. 
  • You have to go to the ‘Controls’ by tapping on the lower left corner of the Tesla touchscreen.
  • Then Navigate to the ‘Software’ and tap on it.
  • You can see if you must install the latest software on the Software menu.
  • Click on ‘Install’ to begin the installation.

Why Does My Tesla Charger Drop To 16a?

The Tesla charger drops due to continuously charging at the same port, making the ‘System’ think it has to charge at this rate. Other than that, faulty wiring, outlet, adapter, breaker or an old software version are typical culprits for the Tesla charge drops at 16a.

Shall I Charge My Tesla At Different Amps?

You should recharge the Tesla at the lower Amperage to save the home electrical system. Also, charging your Tesla at a location other than the frequently used location, such as your home, will resume the charging speed. However, it is best not to go beyond 25 Amps, which you can set by opening the ‘Charging’ Menu in ‘Controls’ on the Tesla screen.

How Do I Increase Amps On My Tesla?

You can trace why the Amps drop on your Tesla when you charge it at home. You can increase the amps by changing the wires between the breaker and outlet of the Tesla charger and connecting it to a sub-panel. (240V).

How Many Amps Should My Tesla Charger Be?

It should be a 50 Amp charger.

What Is The Maximum Amp For A Tesla Charger?

A Tesla can charge from 15 amps to 300 amps. A home charger uses fewer amps, while a supercharger can charge at 300 amps.

How Do You Adjust The Charging Amps on Tesla?

You can adjust the charging amps by opening the ‘Controls’ on the Tesla screen. Or access the Tesla charging app and tap on ‘Charging’. Then, slide the ‘Charge Current’ tab to the right or left to increase or decrease the Amps.

Ending Note

Tesla charging at 16A is real, which can be very annoying when you find that your Tesla is not sufficiently charged in the morning.

So, I highly recommend opting for the solutions I discussed in the guide. However, If you are not familiar with handling electrical devices, seek a professional electrician’s help. Stay Safe!


How To Fix the Tesla Charging At 16Amp

Ways to Fix the Tesla Charging at 16A bug

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