What Does B2319 Mean?
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the feedback potentiometer circuit for the passenger side mirror's vertical adjustment motor. The potentiometer provides position feedback to the BCM so it knows the mirror's tilt position during adjustment. When the circuit voltage reads below the expected threshold (typically near 0 volts), the BCM sets this code indicating a ground fault in the wiring, connector, or potentiometer itself.
Common Causes
45%
Damaged or chafed wiring between the door harness and mirror assembly causing direct short to ground
30%
Failed mirror vertical adjustment potentiometer internally shorted to ground
15%
Corroded or water-damaged mirror connector pins creating ground path
10%
Faulty body control module with internal short on potentiometer feedback circuit
Diagnostic Steps
1
Step 1: Visually inspect the passenger mirror connector and door harness for corrosion, water intrusion, bent pins, or damaged insulation. Disconnect the mirror connector and check for moisture or green corrosion on terminals.
2
Step 2: Using a digital multimeter, measure resistance between the potentiometer feedback wire (typically 5V reference circuit) at the mirror connector and chassis ground with mirror disconnected. Reading should be greater than 10k ohms; near 0 ohms confirms short to ground in mirror assembly.
3
Step 3: Backprobe the potentiometer feedback circuit at the BCM connector with mirror connected and ignition on. Measure voltage which should read approximately 2.5V at rest position. A reading near 0V confirms short exists between BCM and mirror.
4
Step 4: Perform a wiggle test on the door harness while monitoring voltage at BCM connector. Flex the harness at the door hinge area where chafing commonly occurs. Voltage dropping to 0V during flexing indicates intermittent wiring short.
5
Step 5: If wiring tests pass, replace the passenger mirror assembly as the internal potentiometer is likely failed. Clear codes, operate mirror through full range of vertical motion, and verify code does not return and proper feedback voltage varies between 0.5V and 4.5V during travel.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the feedback potentiometer circuit for the passenger side mirror's vertical adjustment motor. The potentiometer provides position feedback to the BCM so it knows the mirror's tilt position during adjustment...
The most common cause of B2319 (Mirror Passenger Vertical Feedback Potentiometer Circuit Short to Ground) is: Damaged or chafed wiring between the door harness and mirror assembly causing direct short to ground
Typical repair costs for B2319 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This fault does not affect vehicle safety or drivability and the vehicle is safe to operate. The passenger mirror vertical adjustment may not function properly or may move to an extreme position, but manual mirror adjustment is still possible.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2319 to identify the root cause.
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Quick Info
Category
Body
System
Power Mirror System
Difficulty
Type
Generic (SAE)
Recommended Tools
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