OBD Guide
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P1AAB

Phase U Open/Short Fault

P1AAB is an OBD-II diagnostic trouble code meaning: Phase U Open/Short Fault. Common causes: broken wires in phase u circuit, short circuit in the circuit. Estimated repair cost: $167–889.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–889 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced motor power
  • The car goes into emergency mode
  • Unusual noises from the electric motor
  • Problems with regenerative braking

Causes

  • Broken wires in phase U circuit
  • Short circuit in the circuit
  • Motor fault
  • Inverter problems
  • Poor contact in connectors

How to Fix

  1. Check the integrity of phase U wires
  2. Check the resistance of the motor windings
  3. Inspect connectors and contacts for corrosion
  4. Check the operation of the inverter
  5. If necessary, replace the electric motor

Related codes

P1AAAP1AACP1AAD

FAQ

What does the P1AAB code mean?

P1AAB is an OBD-II diagnostic trouble code that indicates: Phase U Open/Short Fault

What causes a P1AAB error code?

The most common causes of P1AAB include: Broken wires in phase U circuit; Short circuit in the circuit; Motor fault; Inverter problems.

How do I fix a P1AAB diagnostic trouble code?

To fix P1AAB: Check the integrity of phase U wires. Check the resistance of the motor windings. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1AAB?

Do not drive — repair immediately

How much does it cost to fix P1AAB?

The estimated repair cost for P1AAB is $167–889. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat