B1670

Mirror Passenger Right/Left Motor Stalled

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

In plain language — no jargon

The passenger side mirror motor isn't responding to movement commands and has stopped working. Think of it like a stuck electric motor that's jammed or lost power—the ECU detects the motor isn't moving when it should be.

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Symptoms You May Notice

3 known symptoms for this code
Passenger mirror won't adjust in any direction
Mirror stuck in one position despite control input
No audible motor sound when adjusting controls
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors current draw and motor movement feedback through position sensors on the mirror actuator. When a command is sent, the ECU expects the motor to start drawing current and the mirror position to change within a set timeframe. If current doesn't flow or position doesn't change, a stall condition is detected.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Motor Current Draw 0.5–3 amps during adjustment No current or persistent overload >5 amps
Position Change Response Position feedback changes within 500 ms No position change detected after command
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Mirror control switch connector
Disconnect and reconnect the mirror switch harness to clear corrosion or loose contacts.
2
Mirror motor assembly
Remove the mirror housing and manually check the motor shaft for mechanical jam or debris, then replace if stuck.
3
Mirror control module
Replace the integrated mirror control module if motor draws no current and mechanical check is clear.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1670 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 B1670

What happens after you fix the fault

Once the fault is repaired, B1670 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.