What Does B2205 Mean?
B2205 indicates the Body Control Module (BCM) has detected an electrical fault in the power window switch circuit. This typically means an open circuit, short to ground, short to power, or high resistance condition exists in the wiring or switch itself. The BCM monitors voltage and current flow through the window switch circuit and sets this code when values fall outside expected parameters.
Common Causes
45%
Faulty power window switch with internal contact failure or corrosion
30%
Damaged or corroded wiring harness between BCM and window switch
15%
Poor ground connection or corroded ground terminal at door jamb
10%
Failed Body Control Module unable to properly monitor switch circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of the power window switch assembly for obvious physical damage, liquid intrusion, or corrosion. Remove switch from door panel and inspect connector terminals for bent pins, corrosion, or burned contacts.
2
Step 2: Using a digital multimeter, test continuity of the window switch in both UP and DOWN positions. Each position should show continuity between specific terminals per wiring diagram. If no continuity or erratic readings, replace switch.
3
Step 3: Backprobe the switch connector with multimeter and verify voltage supply (typically 12V) and ground (0V) at appropriate terminals with ignition on. Check for proper voltage changes when activating switch.
4
Step 4: If switch tests good, inspect wiring harness from switch through door jamb to BCM. Check for chafed insulation, pinched wires, or corrosion at door jamb flex point. Test continuity of all circuits end-to-end.
5
Step 5: Verify ground circuit integrity by measuring resistance from switch ground terminal to battery negative. Should read less than 1 ohm. Clean and tighten any ground connections found in circuit.
6
Step 6: Clear codes, reinstall components, and cycle window switch multiple times. Re-scan for codes. If code returns immediately with known good switch and wiring, suspect BCM internal fault requiring module replacement.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
B2205 indicates the Body Control Module (BCM) has detected an electrical fault in the power window switch circuit. This typically means an open circuit, short to ground, short to power, or high resistance condition exists in the wiring or switch itself. The BCM monitors voltage and current flow thro...
The most common cause of B2205 (Window Switch Circuit) is: Faulty power window switch with internal contact failure or corrosion
Typical repair costs for B2205 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not present a safety concern and the vehicle is safe to drive. The power window may be inoperative, which could be an inconvenience but does not affect vehicle operation or safety systems.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2205 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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