Invalid Data Received From Door Switch F

Where it lives

For U0521, the description names the switch as the part involved.

Check these first

• Stale calibration or an outdated software load in the door switch F
• Electrical noise on the data bus corrupting the door switch F signal
• A low battery or charging fault that browns out the door switch F

What to do next

1. Scan all modules and record the stored and pending network codes
2. Check battery voltage and charging output
3. Repair or replace the door switch F if the circuit, power, and bus tests pass
4. Clear the code and retest to confirm the door switch F fault is gone

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