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B0040 Body

Outside Temperature Sensor Circuit

The HVAC or body control module has detected an implausible signal from the outside (ambient) temperature sensor. The displayed outside temperature may be wrong or missing and automatic climate control may behave incorrectly.

Affected components

  • Outside temperature sensor
  • Hvac control module
  • Body control module

Common causes

  • High likelihood: Ambient temperature sensor failed
  • Medium likelihood: Wiring or connector fault to sensor

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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