What Does B2355 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the feedback potentiometer circuit for the passenger side power mirror adjustment system. The potentiometers provide position feedback signals for both horizontal and vertical mirror movement, allowing the BCM to know the mirror's exact position. An open circuit means the BCM is not receiving any voltage signal from one or both potentiometers, preventing proper mirror positioning and memory function.
Common Causes
45%
Failed or worn potentiometers inside the mirror assembly due to water intrusion, internal wear, or manufacturing defect
30%
Broken or corroded wiring between the door jamb and mirror assembly due to repeated door opening/closing flexing
15%
Loose, corroded, or damaged electrical connector at the mirror assembly or door module
10%
Failed body control module or internal circuit fault in BCM power mirror control circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of the passenger mirror wiring harness from the door jamb to the mirror, looking for broken wires, chafing, or damage from repeated door movement. Check all connectors for corrosion, bent pins, or looseness.
2
Step 2: Using a digital multimeter, backprobe the mirror connector with ignition ON and measure voltage at the potentiometer signal wires (typically 5V reference). Compare to manufacturer specifications, usually expecting 0.5-4.5V range depending on mirror position.
3
Step 3: Disconnect the mirror connector and measure resistance across the potentiometer terminals while manually moving the mirror glass horizontally and vertically. Resistance should change smoothly (typically 1-10k ohms range) without any open circuits or infinite resistance readings.
4
Step 4: If potentiometer resistance is erratic or shows open circuit, replace the mirror assembly. If resistance readings are normal, check continuity of all wiring from mirror connector through door jamb to BCM connector, repairing any open circuits found.
5
Step 5: After repairs, clear the code, cycle the mirror through full range of motion in all directions using the mirror switch, and verify smooth operation and proper memory recall function without code returning.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the feedback potentiometer circuit for the passenger side power mirror adjustment system. The potentiometers provide position feedback signals for both horizontal and vertical mirror movement, allowing the BCM to know ...
The most common cause of B2355 (Passenger Mirror Horizontal / Vertical Feedback Potentiometer Circuit Open) is: Failed or worn potentiometers inside the mirror assembly due to water intrusion, internal wear, or manufacturing defect
Typical repair costs for B2355 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects power mirror adjustment functionality. Mirror can typically still be adjusted manually if needed for safe operation. Repair at convenience, though loss of mirror adjustment may impact visibility and safety if mirror position cannot be optimized.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2355 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Body
System
Body Control System - Power Mirror Assembly
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
