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Service procedures 2026 firmware

REAR-LEFT Drive Unit Resolver Error Learning

Gen3/tasks/PROC_DIREL_X_RESOLVER-ERROR-LEARN

What this task does

Calibrate resolver analog input error, required after an inverter swap. Before running routine, verify steering wheel is straight and drive rail is on. After starting routine, follow these steps to complete: 1. With vehicle on lift, shift to gear D within 10 seconds of starting routine, and firmly press accelerator pedal. 2. Keep accelerator pedal pressed until motor starts slowing down on its own. 3. After speedometer reaches 0, press the brake and shift to gear P. Do NOT press brakes during coast down, brake softly if cancelling routine.

Vehicle & firmware coverage

Open a version to see its description, requirements, and input definitions. Hardware configuration and live vehicle checks also determine availability.

Model 3 / Y AMD · Firmware 2026.32.3
Vehicle coverage
2025+ Model Y
Supported connection
Local connection
Vehicle state
Stationary · Parked; Stationary · Neutral
Gateway diagnostic level
Service, DiagLinkActive, Factory

Procedure notes

Axles and wheels will physically rotate after gear shift to D.

Task inputs (0)

No user inputs are listed in this firmware.

Model S / X (2021+) AMD · Firmware 2026.20.6.1
Vehicle coverage
2021+ Model S, 2021+ Model X
Supported connection
Local connection
Vehicle state
Stationary · Parked; Stationary · Neutral
Gateway diagnostic level
Service, DiagLinkActive, Factory

Procedure notes

Axles and wheels will physically rotate after gear shift to D.

Task inputs (0)

No user inputs are listed in this firmware.

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Service procedures

DIREL Application Data Restore

Performs a Drive Inverter Rear Left (DIREL) restore from the latest application data backup saved onto the car computer. This should only be run after the restore bootloader data routine. Requirements: - New compatible drive inverter is installed.

PROC_DIREL_X_ECU-REPLACEMENT-RESTORE-APP

Model S / X (2021+)
Service procedures

DIREL Bootloader and Application Data Store

This routine saves a PMREL and DIREL bootloader and application data backup snapshot from the installed drive inverter onto the car computer. The backup data is needed when performing a drive inverter replacement.

PROC_DIREL_X_ECU-REPLACEMENT-STORE

Model S / X (2021+)
Service procedures

DIREL Bootloader Data Restore

This routine sets the usage id for the rear left inverter and restores the bootloader data from the latest data backup saved onto the car computer. Requirements: - New compatible drive inverter is installed

PROC_DIREL_X_ECU-REPLACEMENT-RESTORE-BOOT

Model S / X (2021+)
Service procedures

Drive Inverter Rear Left (DIREL) - Restore Application Data After Replacement

Restores the Drive Inverter Rear Left (DIREL) application data from the most recent backup on the car computer and configures the Usage ID after a DIREL replacement. Run this routine only after a new compatible drive inverter is installed. After successfully completing, this procedure fails if run multiple times.

PROC_DIREL_X_LEGACY-RESTORE-ENTRYPOINT

Model S / X (2021+)