OBD Guide
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P186C

High Side 3 System Short To Power Supply

P186C is an OBD-II diagnostic trouble code meaning: High Side 3 System Short To Power Supply. Common causes: wiring harness damage, short circuit in load device. Estimated repair cost: $17–89.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable engine operation
  • Failure of certain vehicle systems
  • Check Engine Light Is On
  • Possible problems starting the engine

Causes

  • Wiring harness damage
  • Short circuit in load device
  • Control module malfunction
  • Contact corrosion
  • Mechanical damage to wiring

How to Fix

  1. Check the integrity of the wiring harness
  2. Check the resistance of the load device
  3. Inspect contacts for corrosion
  4. Check the operation of the control module
  5. Replace damaged components

Related codes

P186AP186BP186D

FAQ

What does the P186C code mean?

P186C is an OBD-II diagnostic trouble code that indicates: High Side 3 System Short To Power Supply

What causes a P186C error code?

The most common causes of P186C include: Wiring harness damage; Short circuit in load device; Control module malfunction; Contact corrosion.

How do I fix a P186C diagnostic trouble code?

To fix P186C: Check the integrity of the wiring harness. Check the resistance of the load device. Inspect contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P186C?

Limited driving only, diagnose soon

How much does it cost to fix P186C?

The estimated repair cost for P186C is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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