Code PM_a048 was reported by the “Pedal monitor” controller in the car. The letter “a” in the middle places it among entries of the alert type.
The Pedal Monitor — independent supervision of the accelerator pedal and torque. It makes sure the car only accelerates when the driver actually asks it to. Being a safety function, its codes lead to reduced power.
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.
Pedal Monitor Warning: Stability Control Inhibited.
The safety monitor has detected that stability control is interfering adversely with driving ability. This shall be accompanied by other stability control alerts to aid diagnosis.
The safety monitor has disabled stability control. Customer facing alert that stability control is disabled. Regenerative braking and certain AP features are now disabled.
Pedal Monitor Warning: Accelerator Pedal Error.
The safety monitor sets this condition when accelerator pedal sensor measurements are irrational or out of bounds.
This alert will clear when accelerator pedal sensor measurements are considered rational.
The safety monitor will initiate a limp condition for the remainder of the drive cycle.
Pedal Monitor Warning: Cruise remained on when commanded off.
The safety monitor sets this condition when cruise control operation intepreted by the drive inverter is considered implausible.
The safety monitor may automatically cancel cruise control operation or potentially escalate to inhibiting torque production when detected.
Pedal Monitor Warning: DIR CAN node MIA
PM is not receiving required feedback CAN messages from DIR
PM receives required feedback CAN messages from DIR
Pedal Monitor Warning: External Brake Torque Command is Invalid.
The safety monitor sets this condition when sensor or other ECU inputs into EBR functionality are deemed implausible.
The safety monitor will disable external braking request (EBR) for the remainder of the drive cycle.
Pedal Monitor Warning: Torque Command does not match DI torque command.
Pedal Monitor Warning: Stator Temperature Sensor Error.
The safety monitor sets this condition when stator temperature sensor measurements are irrational or out of bounds.
This alert will clear when stator temeperature sensor measurements are considered rational.
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.