B2326

Mirror Driver Vertical Feedback Potentiometer Circuit Short to Battery

Body Chassis/Safety Mirror control circuit 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The vertical mirror adjustment motor's position sensor is receiving too much electrical power, similar to a volume knob stuck at maximum. The ECU detects this abnormal high voltage and cannot properly control the mirror's up-and-down movement.

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Symptoms You May Notice

3 known symptoms for this code
Mirror does not move up or down when adjusted
Mirror stuck in one vertical position
Dashboard warning light illuminated
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the potentiometer feedback voltage from the mirror's vertical motor actuator. This voltage should vary between approximately 0.5V and 4.5V as the mirror moves. When the circuit shorts to battery voltage (typically 12V), the ECU detects this out-of-range signal and triggers the fault code.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Feedback Voltage 0.5V to 4.5V (proportional to position) >5V or shorted to battery (12V)
Signal Circuit Resistance 100 ohms to 10 kilohms <50 ohms (short condition)
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect and reseat the mirror motor connector on the door panel for corrosion or loose pins.
2
Wiring loom and insulation
Check the door wiring harness for pinched, chafed, or damaged insulation causing shorts between power and signal wires.
3
Mirror motor potentiometer
Replace the mirror motor assembly if internal potentiometer is damaged or internally shorted to the 12V supply.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B2326 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.
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How to Clear Code B2326

What happens after you fix the fault

Once the fault is repaired, B2326 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.