What Does B2317 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the feedback potentiometer for the passenger side mirror's vertical adjustment motor. The potentiometer provides position feedback to the BCM to allow precise mirror positioning. An open circuit means the BCM is receiving no signal from the potentiometer, preventing accurate mirror adjustment and position memory functions.
Common Causes
40%
Broken or corroded wiring between the mirror assembly and door harness connector, often caused by door flexing and opening/closing cycles
35%
Failed potentiometer within the mirror motor assembly due to wear, moisture intrusion, or internal component failure
15%
Loose, corroded, or damaged connector terminals at the mirror base or door module connection point
10%
Failed Body Control Module or internal BCM circuit fault preventing proper potentiometer signal processing
Diagnostic Steps
1
Step 1: Visually inspect the passenger mirror wiring harness from the mirror base through the door hinge area to the door module for broken, chafed, or damaged wires. Check all connectors for corrosion, pushed-back pins, or moisture intrusion.
2
Step 2: Using a digital multimeter, backprobe the mirror connector and measure resistance across the potentiometer circuit terminals (typically 3-wire circuit: power, ground, signal) with the mirror disconnected. Expected reading should be approximately 1-10K ohms with smooth variation as mirror is manually moved; infinite resistance confirms open circuit.
3
Step 3: Perform continuity test between the mirror connector and the BCM connector for the potentiometer signal wire and ground circuit. Wiggle the harness through the door hinge area while testing to identify intermittent opens. Resistance should be less than 1 ohm for each circuit.
4
Step 4: If wiring tests good, apply 5V reference voltage to the potentiometer power pin and measure output signal voltage while manually adjusting mirror position. Voltage should sweep smoothly between 0.5-4.5V; if no voltage change occurs, replace mirror motor assembly.
5
Step 5: Clear codes, operate mirror through full range of motion using mirror switch, and verify proper operation. Monitor live data for potentiometer position feedback values to confirm repair.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the feedback potentiometer for the passenger side mirror's vertical adjustment motor. The potentiometer provides position feedback to the BCM to allow precise mirror positioning. An open circuit means the BCM is receiv...
The most common cause of B2317 (Mirror Passenger Vertical Feedback Potentiometer Circuit Open) is: Broken or corroded wiring between the mirror assembly and door harness connector, often caused by door flexing and opening/closing cycles
Typical repair costs for B2317 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects passenger mirror adjustment convenience features and memory positioning. Repair at convenience, though manual mirror adjustment may be limited or inoperative.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2317 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System - Power Mirrors
Difficulty
Type
Generic (SAE)
Recommended Tools
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