Code TAS_a136 was reported by the “Air suspension” controller in the car. The letter “a” in the middle places it among entries of the alert type.
Tesla Air Suspension — the air chassis: compressor, valves, ride height sensors. These codes show up as the car being unable to raise or level the body, or reporting a loss of pressure. On Model S and X this is a common age-related fault.
The most common type. The car logged the event and may have shown it on the screen. The range is wide — from something trivial that clears itself to something that needs attention.
This is how the fault is named inside the car's firmware. For codes without a description it is the most precise clue there is — the name itself says what the event is about.
The text below comes from Tesla's technical documentation. We leave it in the original English so that translation cannot shift its meaning.
Air compressor or air compressor relay detected open circuit.
Air compressor or air compressor relay commanded on but no electrical current measured.
An airline to the air springs or air reservoir has been detected disconnected/open.
An airline to the air springs or air reservoir has been detected blocked/crushed, detected via a lower than expected increase in pressure when filling using compressor.
Air suspension system is operating under limp home mode 40 restrictions.
The ECU has detected an issue whose severity requires operating under limp home mode 40 restrictions.
Signal line from front left PWM height sensor shorted to ground.
One or more CAN messages from ESP are not being received by the ECU.
One or more CAN messages from ESP are not being received by the ECU (missing, bad RX rate, or invalid checksum/counter).
Successful reception of all RXd CAN messages from ESP.
Ground return wire from corner/reservoir valve block detected disconnected.
Task could not be scheduled because it was already running or pending.
Next reboot, or after 5min of no scheduling errors.
Failure to run tasks on schedule.
Front left height sensor disconnected, or signal line from front left PWM height sensor floating.
Summon not available, vehicle not on private property
Map data for current GPS position suggest that the vehicle is not on private property, considering road class and distance to the nearest road
Enable Summon on a private road
The manual Ecall SOS button (located on the Front Overhead Console) has been disabled because a fault condition was detected
Copy it exactly, letter and number included. Photographing the screen is safest — codes often differ by a single digit, and mixing them up leads somewhere else entirely.
Some codes clear after a screen restart or after the car sits locked for a few hours. If the code does not come back, it was usually a one-off glitch.
A one-off entry and a code that appears after every drive are two different things. It helps a service centre enormously if you know exactly when it shows up.
With airbags, brakes, steering and high voltage there is no point waiting it out. With the other groups you can watch and see whether the code returns at all.
Error codes are only part of the picture. For cars on TesList you also see battery health pulled straight from the vehicle, plus a price calculator that works out from current listings what a given car is actually worth today.