B221D
Rain Sensor Module Internal
B221D is an OBD-II diagnostic trouble code meaning: Rain Sensor Module Internal. Common causes: internal electronics failure of the rain sensor module, damage to module wiring or connectors. Estimated repair cost: $56–167.
Symptoms
- Automatic wipers do not work correctly
- Wipers do not turn on automatically when it rains
- The wipers operate erratically for no apparent reason.
- Error indication on the dashboard
Causes
- Internal electronics failure of the rain sensor module
- Damage to module wiring or connectors
- Damage to the optical surface of the sensor
- Module power problems
- Software error in the module
How to Fix
- Check the connectors and wiring harness of the rain sensor module
- Clean the optical surface of the sensor from dirt
- Check the power supply and ground of the module
- Scan the system for additional errors
- Replace the rain sensor module if necessary
- Flash or update module software (if required)
FAQ
What does the B221D code mean?
B221D is an OBD-II diagnostic trouble code that indicates: Rain Sensor Module Internal
What causes a B221D error code?
The most common causes of B221D include: Internal electronics failure of the rain sensor module; Damage to module wiring or connectors; Damage to the optical surface of the sensor; Module power problems.
How do I fix a B221D diagnostic trouble code?
To fix B221D: Check the connectors and wiring harness of the rain sensor module. Clean the optical surface of the sensor from dirt. Check the power supply and ground of the module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B221D?
Limited driving only, diagnose soon
How much does it cost to fix B221D?
The estimated repair cost for B221D is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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