Air Suspension Fault Detected
What does TESLA-SUSPENSION_A100 mean?
The TESLA-SUSPENSION_A100 (Tesla) EV fault code means: Air Suspension Fault Detected. This is a serious severity code.
Common Symptoms
- Touchscreen displays a yellow or red suspension warning banner
- Car sits visibly lower on one corner or all four corners after sitting overnight
- Ride height does not adjust when you select a different suspension setting in the app or touchscreen
- You hear the air compressor running more than usual or running continuously after parking
- Car raises and lowers unevenly when pulling out of the driveway
- Touchscreen shows 'Suspension Fault' or 'Service Required' in the vehicle status area
- Ride feels noticeably harsher or bouncier than normal, especially at low speed
Probable Causes (Ranked by Likelihood)
- Leaking or failed air strut -- bladder cracked due to age or road debris Very Likely
- Air compressor worn out or seized -- common after 5-7 years, especially in humid climates Very Likely
- Height sensor out of calibration or physically damaged by a curb strike or road debris Likely
- Air line fitting or distribution manifold leaking at a connection point Likely
- Solenoid valve in the valve block stuck open or shorted -- causes one corner to not hold pressure Possible
- Wiring harness chafed or connector corroded on the height sensor or compressor circuit Possible
- Software glitch in the suspension controller after an OTA update -- requires a reboot to clear Less Likely
Step-by-Step Diagnostic Procedure
Start with a soft reboot. Hold both scroll wheel buttons simultaneously for about 10 seconds until the touchscreen restarts. If the fault clears and does not return within 24 hours, it was likely a temporary software glitch. If it comes back, keep going.
Park on level ground and visually inspect each corner of the car. If one corner sits lower than the others, that corner's air strut is the most likely culprit. Note which corner is low -- this narrows the repair significantly.
Listen for the compressor. After you park and lock the car, stand near the front of the vehicle and listen for 2-3 minutes. A healthy system should be quiet or cycle briefly. If you hear continuous compressor noise, you have a leak somewhere in the system.
Use Scan My Tesla with an OBDLink MX+ or Veepeak adapter to pull live suspension data. Look at the height sensor values for all four corners. A sensor reading that is stuck at a fixed number or reading wildly out of range when the car is level points to that sensor or its wiring.
Inspect the height sensor arms at each corner. They are small plastic or aluminum linkages that connect the suspension to the body. Look for cracks, missing clips, or a rod that has popped off the ball socket. This is a visual check you can do without tools by looking behind each wheel.
Check for air leaks with soapy water in a spray bottle. With the car raised to High ride height via the touchscreen, spray around the top of each strut, the air line connections at the valve block (usually located in the driver-side front wheel well area), and anywhere rubber meets metal. Bubbles indicate the leak location.
If the compressor runs but cannot raise the car at all, connect a multimeter to the compressor power connector and confirm you have 12V supply when the system commands it. No voltage points to a relay or wiring fault. Full voltage with no movement means the compressor motor itself has failed.
If any step above requires removing a strut, accessing the valve block under the wheel well liner, or reprogramming a height sensor, that work requires Tesla Toolbox 3 or a shop with a compatible scan tool to perform the post-replacement calibration. Note this before disassembly so you are not stuck mid-repair.
Frequently Asked Questions
What does SUSPENSION_a100 mean on my Tesla?
It means the air suspension system has detected a fault. The car's controller monitors the compressor, the height sensors at each corner, and the valve block that routes air to each strut. When any of those components behaves outside its expected range, this code gets logged. The most common real-world cause on older Model S and Model X cars is a leaking air strut or a worn compressor.
Can I still drive with this code active?
Usually yes, but with caution. The car will often lock the suspension at a fixed ride height and disable the ability to raise or lower it. If one corner is significantly lower than the others, handling is affected and you should limit highway speeds. Do not ignore a car that is sitting on the bump stops -- that means the strut has completely lost pressure and driving further can damage the strut housing and wheel well components.
How much does it cost to fix?
It depends heavily on which component failed. A height sensor or wiring fix might cost $100-$400 DIY or $200-$600 at an independent shop. A single air strut replacement runs $400-$900 in parts if you do it yourself, or $700-$1,500 at a shop per corner. A compressor is $200-$500 DIY. Full four-corner strut replacement at a shop can easily reach $3,000-$5,000. Independent EV shops that specialize in Tesla typically charge less than a Tesla Service Center for this job.
Will my Tesla settle low overnight even if it drives fine during the day?
Yes, this is one of the most common signs of a small air leak. During the day, the compressor tops off the system frequently enough that you do not notice. Overnight, with the compressor off, even a slow leak will drop a corner by an inch or two. If you are seeing this pattern consistently on the same corner, that corner's strut or its associated valve is leaking and the code will keep returning until the leak is fixed.