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B0540 Body

Driver Door Ajar Switch Circuit

The driver door ajar switch circuit is reporting an implausible signal. The interior light may stay on or door open warning may be incorrect.

Affected components

  • Driver door ajar switch
  • Body control module

Common causes

  • High likelihood: Corroded door switch / striker
  • Medium likelihood: Wire break in door harness

Possible symptoms

  • Warning light or symbol related to the affected system
  • Comfort or safety function impaired

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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