OBD Guide
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B1786

Mirror Passenger Down Circuit Failure

B1786 is an OBD-II diagnostic trouble code meaning: Mirror Passenger Down Circuit Failure. Common causes: open or short circuit in wiring harness, mirror motor malfunction. Estimated repair cost: $111–222.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$111–222 (est.)

Symptoms

  • Right mirror won't go down
  • The mirror does not respond to switch commands
  • Intermittent mirror operation

Causes

  • Open or short circuit in wiring harness
  • Mirror motor malfunction
  • Problems with the mirror switch
  • Damage to connectors or corrosion of contacts

How to Fix

  1. Check wiring harness for damage
  2. Test the mirror motor
  3. Check mirror switch
  4. Clean or replace connectors if necessary

Related codes

B1785B1787

FAQ

What does the B1786 code mean?

B1786 is an OBD-II diagnostic trouble code that indicates: Mirror Passenger Down Circuit Failure

What causes a B1786 error code?

The most common causes of B1786 include: Open or short circuit in wiring harness; Mirror motor malfunction; Problems with the mirror switch; Damage to connectors or corrosion of contacts.

How do I fix a B1786 diagnostic trouble code?

To fix B1786: Check wiring harness for damage. Test the mirror motor. Check mirror switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1786?

Limited driving only, diagnose soon

How much does it cost to fix B1786?

The estimated repair cost for B1786 is $111–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat