OBD Guide
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P1AAC

Phase V Open/Short Fault

P1AAC is an OBD-II diagnostic trouble code meaning: Phase V Open/Short Fault. Common causes: open circuit in phase v, short circuit in the circuit. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Check Engine light comes on
  • Hybrid system power reduction
  • The vehicle goes into emergency mode
  • Increased fuel consumption
  • Unstable operation of the hybrid system

Causes

  • Open circuit in phase V
  • Short circuit in the circuit
  • Malfunction of the hybrid system control module
  • Wiring harness damage
  • Contact corrosion

How to Fix

  1. Check continuity of phase V circuit
  2. Look for signs of a short circuit
  3. Check the condition of the wiring harness
  4. Clean contacts from corrosion
  5. Replace faulty components
  6. Repair only from an authorized dealer

Related codes

P1AABP1AADP1AAE

FAQ

What does the P1AAC code mean?

P1AAC is an OBD-II diagnostic trouble code that indicates: Phase V Open/Short Fault

What causes a P1AAC error code?

The most common causes of P1AAC include: Open circuit in phase V; Short circuit in the circuit; Malfunction of the hybrid system control module; Wiring harness damage.

How do I fix a P1AAC diagnostic trouble code?

To fix P1AAC: Check continuity of phase V circuit. Look for signs of a short circuit. Check the condition of the wiring harness. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1AAC?

Limited driving only, diagnose soon

How much does it cost to fix P1AAC?

The estimated repair cost for P1AAC is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat