Driver Mirror Vertical Feedback Circuit Short to Ground
The B2327 code indicates a short to ground in the driver's mirror vertical position feedback potentiometer circuit. This potentiometer is a resistive sensor that monitors the vertical angle of the exterior mirror, sending a variable voltage signal to the seat or mirror control module (DSM/MSM). A short to ground pulls the feedback signal permanently to 0V, preventing the module from determining the actual mirror position. This code is specific to Ford Motor Company and its associated brands, where it is implemented in memory mirror systems.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or worn internal potentiometer in the mirror motor
- Wiring between the mirror and control module with deteriorated insulation contacting chassis ground
- Corroded or bent pins in the mirror connector causing a short to ground
- Internal mirror motor fault affecting the potentiometer circuit
- Damaged input circuit in the seat/mirror control module (DSM/MSM)
3. Symptoms You Will Notice
- Driver's exterior mirror does not move vertically or moves erratically
- Mirror position memory function inoperative
4. Step-by-Step Diagnosis
Scan for additional codes and verify B2327 is present
Visually inspect mirror connector and wiring for damage, corrosion, or shorts to ground
Test potentiometer signal voltage at the mirror connector while moving the mirror vertically; should vary between 0.5V and 4.5V
If signal is stuck at 0V, disconnect mirror and check for short to ground in wiring harness
If wiring is okay, replace the mirror assembly (potentiometer is integral to the motor)
If problem persists, test control module input and replace module if necessary
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects the driver's mirror vertical adjustment and memory function, not the vehicle's safety systems.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the mirror assembly or control module needs replacement and labor rates.