What Does B2336 Mean?
B2336 indicates the Body Control Module (BCM) has detected an electrical fault in the power mirror switch assembly circuit. This code is set when the BCM detects an open circuit, short circuit, excessive resistance, or loss of communication with the mirror switch assembly. The mirror adjustment functionality may be inoperative or intermittent in one or both mirrors.
Common Causes
45%
Faulty mirror switch assembly with internal circuit failure or worn contacts
30%
Damaged or corroded wiring harness between BCM and mirror switch, including chafed wires or broken connectors
15%
Corroded or loose electrical connector at mirror switch or BCM with poor pin contact
10%
Failed Body Control Module with internal circuit fault or water damage
Diagnostic Steps
1
Step 1: Perform visual inspection of mirror switch assembly and connector for obvious damage, corrosion, moisture intrusion, or loose pins. Check door jamb harness flex area for wire damage from repeated opening/closing.
2
Step 2: Using a digital multimeter, test for battery voltage and ground at mirror switch connector with ignition on. Verify voltage supply (typically 12V) and ground integrity (less than 0.5 ohms resistance to chassis ground).
3
Step 3: Disconnect mirror switch connector and measure resistance across switch terminals while actuating the switch through all positions (left/right/up/down). Compare readings to manufacturer specifications for open/closed circuit values (typically 0-5 ohms when activated, infinite when at rest).
4
Step 4: If switch tests good, inspect wiring continuity from switch to BCM by testing resistance on each circuit wire (should be less than 5 ohms). Check for shorts to ground or shorts to power (should show infinite resistance).
5
Step 5: Test mirror motor operation by applying direct 12V power to each mirror motor circuit at the mirror connector to verify motors function properly, ruling out back-fed faults from mirror assemblies.
6
Step 6: Clear codes, reconnect all components, cycle ignition and mirror switch through all functions. Monitor live data for switch position inputs at BCM to verify proper signal recognition and confirm repair.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
B2336 indicates the Body Control Module (BCM) has detected an electrical fault in the power mirror switch assembly circuit. This code is set when the BCM detects an open circuit, short circuit, excessive resistance, or loss of communication with the mirror switch assembly. The mirror adjustment func...
The most common cause of B2336 (Mirror Switch Assembly Circuit Failure) is: Faulty mirror switch assembly with internal circuit failure or worn contacts
Typical repair costs for B2336 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects mirror adjustment convenience features. Repair at your convenience, though proper mirror adjustment is important for visibility and safe lane changes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2336 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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