OBD Guide
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B2318

Mirror Passenger Vertical Feedback Potentiometer Circuit Short To Battery

B2318 is an OBD-II diagnostic trouble code meaning: Mirror Passenger Vertical Feedback Potentiometer Circuit Short To Battery. Common causes: wiring harness damage, vertical adjustment potentiometer malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Inability to adjust the passenger mirror in the vertical plane
  • Spontaneous movement of the mirror
  • Complete failure of the mirror
  • The malfunction indicator on the instrument panel lights up

Causes

  • Wiring harness damage
  • Vertical adjustment potentiometer malfunction
  • Short circuit in the circuit
  • Problems in the mirror control unit
  • Contact corrosion

How to Fix

  1. Check wiring harness for damage
  2. Check the integrity of the potentiometer circuit
  3. Check the operation of the potentiometer
  4. Check the mirror control unit
  5. Replace damaged components
  6. Clean contacts from corrosion

Related codes

B2317B2319B2320

FAQ

What does the B2318 code mean?

B2318 is an OBD-II diagnostic trouble code that indicates: Mirror Passenger Vertical Feedback Potentiometer Circuit Short To Battery

What causes a B2318 error code?

The most common causes of B2318 include: Wiring harness damage; Vertical adjustment potentiometer malfunction; Short circuit in the circuit; Problems in the mirror control unit.

How do I fix a B2318 diagnostic trouble code?

To fix B2318: Check wiring harness for damage. Check the integrity of the potentiometer circuit. Check the operation of the potentiometer. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2318?

Limited driving only, diagnose soon

How much does it cost to fix B2318?

The estimated repair cost for B2318 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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