B1668

Mirror Driver Right/Left Motor Stalled

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

In plain language — no jargon

Your car's side mirror motor is stuck or not responding to movement commands, like a stuck window that won't roll down. The ECU detected that the mirror motor isn't moving when it should be.

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Symptoms You May Notice

3 known symptoms for this code
Side mirror won't adjust up, down, left, or right
Mirror position doesn't change when control switch is pressed
Clicking sound from mirror housing without actual movement
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors motor current draw and position feedback from the mirror actuator. When a command is sent, the motor should draw current and the mirror should move; if current flows but no position change occurs within the expected time window, the ECU logs a stall fault.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Motor Current Draw 0.5–2.5 amps during movement Current sustained above 3 amps without position change for >2 seconds
Mirror Position Change Detectable movement within 500ms of command No position feedback after 1-2 seconds of motor activation
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Mirror control switch
Clean electrical contacts on the switch with a dry cloth and test again; corrosion often causes false stall signals.
2
Mirror motor connector
Disconnect and reconnect the motor plug at the mirror housing to reseat corroded pins.
3
Side mirror motor assembly
Replace the entire mirror motor unit if mechanical jam is suspected or electrical fixes fail.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1668 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 B1668

What happens after you fix the fault

Once the fault is repaired, B1668 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.