What This Actually Means
In plain language — no jargon
The vertical position sensor in your side mirror is shorted to ground, like a broken wire touching metal. The car can't read the mirror's up-and-down position feedback.
Symptoms You May Notice
3 known symptoms for this code
Mirror won't move up or down
Mirror stuck in one position
No response to mirror control button
How Your ECU Detects This
Technical sensor logic and voltage thresholds
The ECU sends a reference voltage (typically 5V) to the potentiometer and monitors the return signal. When the mirror moves, resistance changes and voltage drops proportionally. A short to ground pulls voltage to 0V constantly, triggering the fault.
Voltage & Parameter Thresholds
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Potentiometer Output Voltage | 0.5V to 4.5V | 0V or below 0.2V (shorted) |
| Resistance | 1kΩ to 9kΩ | Less than 100Ω (shorted to GND) |
Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect and reseat the mirror control connector to eliminate corrosion or loose pins causing false short.
2
Mirror motor assembly
Remove the door panel and test continuity on the potentiometer leads; replace if shorted internally.
3
Wiring loom repair
Trace the feedback wire from mirror to ECU for pinches, cuts, or damaged insulation causing ground contact.
When to See a Professional Mechanic
Not all fault codes are safe to DIY
Code B2327 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
How to Clear Code B2327
What happens after you fix the fault
Once the fault is repaired, B2327 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.
✅ Safe to Clear When
- Fault has been diagnosed and repaired
- You want to confirm the repair worked
- Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
- Preparing for an emissions/PUC test
- Root cause is still undiagnosed
- Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.