What Does B2210 Mean?
This code indicates the Body Control Module (BCM) has detected a short circuit to ground in the interior lamp override switch circuit. The override switch allows manual control of interior lighting independent of door switches or other automatic triggers. The BCM detected current flow or voltage levels consistent with the switch circuit being directly connected to ground, bypassing normal switch operation.
Common Causes
40%
Damaged wiring harness or chafed wire insulation causing the switch circuit wire to contact vehicle ground
30%
Failed interior lamp override switch with internal short to ground
20%
Water intrusion or corrosion in switch connector causing short circuit path to ground
10%
BCM internal fault with switch input circuit grounding internally
Diagnostic Steps
1
Step 1: Perform visual inspection of interior lamp override switch, connector, and accessible wiring. Look for signs of damage, corrosion, water intrusion, pinched wires, or chafing against metal panels. Check all related fuses for damage.
2
Step 2: Disconnect the interior lamp override switch connector. Using a digital multimeter, measure resistance between the switch signal wire terminal (BCM side) and known good chassis ground. Should read infinite resistance (open circuit). If reading near 0 ohms, wiring harness has short to ground.
3
Step 3: If harness tested good, measure resistance across the switch terminals with switch disconnected. Test switch in both positions. Compare readings to manufacturer specifications (typically should show open circuit in one position, continuity in other, never direct ground). Replace switch if shorted.
4
Step 4: If switch and harness test good, check for moisture or corrosion in connector. Clean terminals with electrical contact cleaner and dielectric grease. Reconnect and clear codes to verify repair.
5
Step 5: If fault persists after wiring and switch verification, trace wiring harness from switch to BCM looking for pinch points at door hinges, under seats, and through firewall. Use resistance measurements to isolate short location.
6
Step 6: After repairs, clear code, cycle switch through all positions multiple times, and perform test drive. Monitor for code recurrence using live data to confirm BCM sees proper switch signal transitions.
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short circuit to ground in the interior lamp override switch circuit. The override switch allows manual control of interior lighting independent of door switches or other automatic triggers. The BCM detected current flow or voltage lev...
The most common cause of B2210 (Interior Lamp Override Switch Short to Ground) is: Damaged wiring harness or chafed wire insulation causing the switch circuit wire to contact vehicle ground
Typical repair costs for B2210 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects manual interior lighting control. Interior lights may not function properly or may remain on/off regardless of switch position, which could cause battery drain if lights stay on or reduced visibility entering vehicle at night. Repair at convenience but address promptly to prevent battery discharge.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2210 to identify the root cause.
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Quick Info
Category
Body
System
Interior Lighting Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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