Tesla · 2019–2026
Common Tesla Model 3 problems, and how to check them
These are the 3 faults owners and garages report most often on the Tesla Model 3, from the most common down. For each one: what goes wrong, how to check it yourself, and the usual fix, so you know what you’re dealing with before you buy parts.
Fact-checked by a licensed car technician · last reviewed 27 September 2026
Problem 1
Tesla Model 3: Car won’t wake up: weak low-voltage (12 V / 16 V) battery
What goes wrong
The small low-voltage battery that runs the car’s computers ages; when it fails the car can’t wake up even with a full main battery.
How to check it yourself
Look for a low-voltage battery warning in the app or on screen before it fails; measure the low-voltage battery if you can reach it.
The usual fix
Replace the low-voltage battery (older cars use 12 V lead-acid, later cars a 16 V lithium-ion unit via Tesla service).
Signs: No crank
Problem 2
Tesla Model 3: Creaking or clunking front upper control arms
What goes wrong
The front upper control arm ball joints and bushes wear and creak.
How to check it yourself
Listen near the front wheels when rolling slowly over speed bumps or when turning at low speed.
The usual fix
Replace the front upper control arms (revised parts are available).
Signs: Clunk over bumps, Noise when turning
Problem 3
Tesla Model 3: No cabin heat in cold weather: heat pump or octovalve fault
What goes wrong
Refrigerant loss, moisture, or a failing octovalve or compressor in the heat pump system (fitted from 2021).
How to check it yourself
Note whether heating fails only in the cold; check for climate alerts in the service menu or app.
The usual fix
Book a Tesla service check for refrigerant level, the compressor, and the octovalve; software updates have fixed some cases.
Signs: Ac not cold
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer