OBD Guide
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P186B

High Side 3 System Open Circuit

P186B is an OBD-II diagnostic trouble code meaning: High Side 3 System Open Circuit. Common causes: wire break in high side 3 circuit, damaged connector. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Incorrect operation of a related component
  • Switching to emergency mode
  • Malfunction indicator light comes on
  • Decreased system performance

Causes

  • Wire break in High Side 3 circuit
  • Damaged connector
  • Blown fuse
  • Control module malfunction
  • Short circuit in the circuit

How to Fix

  1. Check continuity of High Side 3 circuit
  2. Inspect connectors for damage
  3. Check the condition of the fuses
  4. Test the associated component
  5. Check the operation of the control module

Related codes

P186AP186CP186D

FAQ

What does the P186B code mean?

P186B is an OBD-II diagnostic trouble code that indicates: High Side 3 System Open Circuit

What causes a P186B error code?

The most common causes of P186B include: Wire break in High Side 3 circuit; Damaged connector; Blown fuse; Control module malfunction.

How do I fix a P186B diagnostic trouble code?

To fix P186B: Check continuity of High Side 3 circuit. Inspect connectors for damage. Check the condition of the fuses. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P186B?

Yes, but get it checked soon

How much does it cost to fix P186B?

The estimated repair cost for P186B is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat