B2210: Interior Lamp Override Switch Short to Ground
The B2210 code indicates that the Body Control Module (BCM) has detected a short to ground in the interior lamp override switch circuit. This switch allows the driver to manually disable the vehicle's interior lighting. A short to ground creates an unintended connection to chassis ground, causing the BCM to interpret a permanent or erroneous activation signal from the switch. This can lead to improper interior lighting operation, such as lights not responding correctly to the switch or remaining abnormally on or off.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or internally damaged interior lamp override switch
- Damaged insulation in the switch circuit wiring contacting chassis ground
- Moisture, corrosion, or damaged pins in the switch connector causing a short
- Internal short in the wiring harness between the switch and the BCM
- Defective BCM (less common, but possible after ruling out other causes)
3. Symptoms You Will Notice
- Interior lights do not respond to the override switch
- Interior lights remain on or off regardless of switch position
4. Step-by-Step Diagnosis
Inspect the interior lamp override switch and its connector for damage, moisture, or corrosion
Check the wiring between the switch and BCM for shorts to ground using a multimeter
Test the switch operation by measuring continuity across its terminals
If all else is normal, perform a BCM self-test or reprogramming as per manufacturer procedure
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The issue only affects interior lighting and does not impact vehicle safety or drivability.
How much does it cost to fix?▼
Repair costs typically range from $50 to $200, depending on whether the switch, wiring repair, or BCM replacement is needed.