What Does B2316 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the feedback potentiometer circuit for the passenger side mirror's vertical (up/down) adjustment motor. The potentiometer provides position feedback to the BCM, allowing precise mirror positioning. The BCM has identified an abnormal voltage reading, open circuit, short circuit, or resistance value outside acceptable parameters in this feedback circuit.
Common Causes
45%
Failed or worn feedback potentiometer inside the passenger mirror assembly
30%
Damaged, corroded, or loose wiring harness connector at the passenger mirror
15%
Broken or frayed wiring between BCM and passenger mirror assembly
10%
Failed Body Control Module (BCM) with faulty mirror control circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of the passenger mirror connector and wiring harness for corrosion, damage, water intrusion, or loose connections. Check for broken wires in the door jamb area where flexing occurs.
2
Step 2: Using a digital multimeter, backprobe the mirror connector and measure the potentiometer feedback voltage while manually moving the mirror through its vertical range. Normal range is typically 0.5-4.5V with smooth transitions; erratic readings indicate potentiometer failure.
3
Step 3: Check continuity and resistance of the feedback circuit wiring from the mirror connector back to the BCM connector. Resistance should be less than 5 ohms; infinite resistance indicates an open circuit.
4
Step 4: If wiring tests normal, remove the mirror assembly and test the potentiometer directly with an ohmmeter while rotating the adjustment mechanism. Resistance should change smoothly from approximately 1-10k ohms without dropouts or jumps.
5
Step 5: Replace the faulty component (mirror assembly if potentiometer failed, repair wiring if circuit fault found), clear codes, and verify proper mirror operation through full range of motion using the mirror switch while monitoring live data for smooth voltage transitions.
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the feedback potentiometer circuit for the passenger side mirror's vertical (up/down) adjustment motor. The potentiometer provides position feedback to the BCM, allowing precise mirror positioning. The BCM has identified an ab...
The most common cause of B2316 (Mirror Passenger Vertical Feedback Potentiometer Circuit Failure) is: Failed or worn feedback potentiometer inside the passenger mirror assembly
Typical repair costs for B2316 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. This fault only affects power mirror adjustment functionality and does not impact vehicle operation or safety systems. The mirror can typically be adjusted manually if needed, though the power adjustment feature will be inoperative.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2316 to identify the root cause.
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Quick Info
Category
Body
System
Body Comfort and Convenience Systems
Difficulty
Type
Generic (SAE)
Recommended Tools
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