B1670 — Mirror Passenger Right/Left Motor Stalled #

Note: The wording of this code may vary depending on the vehicle manufacturer.

• Mirror Passenger Right/Left Motor Stalled (Ford, Lincoln, Mercury)
• Right/Left Power Mirror Motor Stalled (General Motors, Chevrolet, Buick)
• Outside Mirror Motor Stalled, Passenger Side (Toyota, Lexus)
• Side Mirror Adjustment Motor Malfunction, RH/LH (Honda, Acura)

Summary for code B1670 #

The B1670 diagnostic trouble code (DTC) indicates that the power mirror motor on either the passenger (right) or driver (left) side has stalled or is not moving as commanded by the vehicle’s control module. This code is stored when the Body Control Module (BCM) or similar controller detects that the mirror adjustment motor is not operating properly, usually due to excessive current draw or zero movement while being powered. In simple terms, the system senses that the mirror’s adjustment mechanism is “stuck.” While this doesn’t impact core vehicle safety, it does affect comfort and visibility, especially if you rely on powered mirror adjustments. Diagnosing and correcting this code helps restore full functionality to your side mirrors and avoids further electrical strain.

Common symptoms for code B1670 #

When B1670 is present, you’ll likely notice some clear signs relating to your side mirrors. The main issue is the inability to adjust the mirror using the power switch, but other subtle symptoms can also occur. Often, the fault is accompanied by noise or a lack thereof, depending on what failed.

• Power mirror (right or left) does not move in one or more directions
• Mirror adjustment switch works for one side, but not the other
• Grinding or clicking noises from the mirror housing when trying to adjust
• Complete silence when attempting adjustment (no motor sound)
• Power mirror fuse may blow (rare)
• Illuminated mirror or body-related warning light on the dashboard (in some vehicles)

Most likely causes for code B1670 #

Several factors can lead to a B1670 code, but some are much more common than others. The usual suspects range from mechanical binding to electrical faults. Here are the most frequent culprits, ranked by likelihood:

1. Mirror motor failure (internal electrical or mechanical fault)
2. Obstruction or physical jam in the mirror mechanism (ice, debris, or broken internal parts)
3. Wiring issues: damaged, pinched, or corroded wires between the switch, control module, and mirror motor
4. Faulty mirror adjustment switch (less common)
5. Control module malfunction (rare, usually after ruling out all else)

Step-by-step diagnostic for code B1670 #

Diagnosing B1670 requires a methodical approach to avoid missed problems or unnecessary part swaps. Here’s a proven workflow:

• 1. Confirm the code and identify the affected side with a suitable diagnostic scanner that reads body codes.
• 2. Visually inspect the mirror and its housing for signs of physical damage, ice, debris, or anything blocking movement.
• 3. Operate the mirror in all directions and listen for any motor operation or unusual noises.
• 4. Check the power and ground supply at the mirror motor using a multimeter while operating the switch.
• 5. Inspect the wiring harness and connectors between the door, mirror, and BCM for damage or corrosion.
• 6. Bench test the mirror motor by applying power and ground directly (if accessible) to verify if it runs outside the vehicle circuit.
• 7. Test the mirror adjustment switch for continuity and proper operation (compare with the working side if possible).
• 8. If all else checks out, consider testing/replacing the BCM or relevant control module (rare; consult OEM procedures).

Possible repairs for code B1670 #

The right repair depends entirely on what caused the code in your case. Here are the most effective solutions, linked to the root causes identified:

• Replace the faulty mirror motor (most common remedy)
• Clear physical obstructions or repair broken mirror mechanism parts
• Repair or replace damaged wiring or connectors in the mirror circuit
• Replace the mirror adjustment switch if found faulty
• Replace or reprogram the control module (only after all other causes are ruled out, and following OEM instructions)

Is it safe to drive with code B1670? #

Yes, you can safely drive with a B1670 code, as it does not pose an immediate threat to vehicle safety or drivability. However, you may experience reduced visibility if you’re unable to adjust the affected side mirror, which can impact safe lane changes or parking. If the mirror is stuck in a non-ideal position, extra caution is advised when driving and maneuvering.

Vehicles most commonly affected by code B1670 #

This code appears most frequently on vehicles equipped with power-adjustable side mirrors. While it’s not exclusive to any single make, some brands and models are reported more often in technical forums and repair shops:

• Ford F-150, Explorer, Fusion
• Chevrolet Silverado, Malibu, Impala
• Honda Accord, CR-V, Civic
• Toyota Camry, Corolla, RAV4
• Buick Enclave, GMC Acadia
• Lexus ES/GS series
• Acura MDX, TL

Common mistakes & best practices for code B1670 #

Misdiagnosing a B1670 code can lead to wasted time and money. Avoid these pitfalls and follow these professional habits:

• Assuming the motor is always at fault — always check for obstructions and wiring issues first
• Overlooking simple causes like ice, gunk, or debris jamming the mirror
• Swapping mirror assemblies without testing the motor outside the car
• Ignoring wiring in the door jamb, where repeated door movement can cause breaks or shorts
• Not verifying power/ground at the motor before replacing expensive parts
• Always clear the code and retest after repairs to confirm the fix

Express FAQ for code B1670 #

Got questions? Here are quick answers to what drivers and DIYers ask most often:

• Q: Will a B1670 code drain my battery?
  A: Typically, no. However, if the motor is stuck and continuously drawing current, it might cause a parasitic drain. Most modern systems shut off power after a few seconds.
• Q: Can I replace just the mirror motor, or do I need the whole assembly?
  A: On many vehicles, the motor can be serviced separately, but on some models, the motor is integrated and the entire mirror assembly must be replaced. Check OEM parts diagrams for your specific vehicle.