What Does B2273 Mean?
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected an abnormal electrical condition in the power mirror motor control circuit. The BCM monitors voltage, current, or resistance values in the mirror positioning motor circuit and has identified a value outside of normal operating parameters. This could indicate a short circuit, open circuit, excessive resistance, or a failed mirror motor that is drawing too much current or not responding to commands.
Common Causes
40%
Failed or binding power mirror motor assembly causing excessive current draw or mechanical jam
30%
Damaged, corroded, or loose wiring harness connector at the mirror or BCM causing open or high resistance
20%
Short circuit to ground or power in mirror motor wiring between BCM and mirror assembly
10%
Failed Body Control Module internal mirror driver circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of the affected mirror assembly for physical damage, binding, or obstruction. Manually attempt to move mirror glass to check for smooth operation or mechanical binding that would cause motor overload.
2
Step 2: Inspect mirror wiring harness and connector at both the mirror base and BCM for corrosion, pushed-back pins, water intrusion, or physical damage. Wiggle test connectors while monitoring live data for intermittent faults.
3
Step 3: Using a digital multimeter, backprobe the mirror motor connector and measure resistance across motor terminals (typically 5-15 ohms for each motor direction). Compare readings to manufacturer specifications and test for shorts to ground on motor supply wires.
4
Step 4: With connector disconnected, command mirror operation through scan tool actuator tests while measuring voltage at BCM output pins (should see battery voltage or ground switching). If BCM outputs are correct but mirror doesn't operate, replace mirror assembly.
5
Step 5: Check for voltage drops in power and ground circuits by measuring voltage at mirror connector while commanding operation (should be within 0.5V of battery voltage on power side, and less than 0.2V on ground side).
6
Step 6: After repair, clear codes, perform mirror function tests in all directions (up, down, left, right), and road test vehicle. Re-scan for codes to verify repair and ensure no additional mirror-related faults are present.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the Body Control Module (BCM) has detected an abnormal electrical condition in the power mirror motor control circuit. The BCM monitors voltage, current, or resistance values in the mirror positioning motor circuit and has identified a value outside of nor...
The most common cause of B2273 (Mirror Motor Control Circuit) is: Failed or binding power mirror motor assembly causing excessive current draw or mechanical jam
Typical repair costs for B2273 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this affects only mirror adjustment functionality and does not impact vehicle operation or safety systems. Repair can be scheduled at convenience, though properly functioning mirrors are important for safe lane changes and visibility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2273 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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