Passenger Mirror Vertical Feedback Short to Ground
The B2319 code indicates that the Body Control Module (BCM) or mirror control module has detected a short to ground in the passenger side mirror vertical position potentiometer signal circuit. This potentiometer reports the mirror's vertical position for memory and auto-fold functions; a short to ground prevents accurate position reading, disabling automatic memory operation.
1. Commonly Affected Makes
2. Most Common Causes
- Signal wire for the vertical potentiometer shorted to ground (chassis)
- Faulty passenger mirror vertical feedback potentiometer (internal short)
- Damaged, corroded, or pushed-back terminals in the mirror or harness connector
- Faulty mirror control module (DSM/BCM) – rare
3. Symptoms You Will Notice
- Passenger mirror does not return to saved memory position
- Auto-fold or tilt-in-reverse feature inoperative on passenger side
4. Step-by-Step Diagnosis
Scan for B2319 and related codes; verify passenger mirror memory function
Inspect mirror and harness connectors for corrosion, damage, or pushed pins
Measure resistance between signal wire and ground; if near 0 ohms, locate and repair short
If wiring is good, test potentiometer by backprobing; replace mirror assembly if faulty
If all else passes, suspect BCM/mirror module and perform module self-test
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle remains drivable. However, the passenger mirror memory and auto-fold features will be disabled until repaired.
How much does it cost to fix?▼
Diagnosis typically $100-$150. Repair costs vary: wiring repair $150-$300, mirror assembly replacement $300-$600, module replacement $400-$800.