Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Land Rover Defender 90FACTORY OEM SERVICE PROCEDURE
DTC U201A-57: Control Module Main Calibration Data - Invalid/incomplete software component: Action
NOTE:
After updating the car configuration file, set the ignition to on and wait 30 seconds before clearing the Diagnostic Trouble Code(s)
- Using the Jaguar Land Rover approved diagnostic equipment, reconfigure the restraints control module with the latest level software and calibration
- Using the Jaguar Land Rover approved diagnostic equipment, check and update the Car Configuration File (CCF) as required. Perform routine - Allow Central Configuration Data Learning (0x0E06). Clear the Diagnostic Trouble Code(s) and retest
- Check if the gateway module is broadcasting the correct car configuration file. Check the gateway module for car configuration file related Diagnostic Trouble Code(s) and refer to the relevant DTC index
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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