OBD Guide
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P1A03

Drive Motor 'A' Shutdown Circuit

P1A03 is an OBD-II diagnostic trouble code meaning: Drive Motor 'A' Shutdown Circuit. Common causes: faulty engine cut-off relay, open or short circuit in the circuit. Estimated repair cost: $17–89.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–89 (est.)

Symptoms

  • Hybrid system does not activate
  • Check Engine light comes on
  • Motor power loss
  • Error message on the dashboard
  • Problems with switching between driving modes

Causes

  • Faulty engine cut-off relay
  • Open or short circuit in the circuit
  • Wiring harness damage
  • Contact corrosion
  • Malfunction of the hybrid system control unit

How to Fix

  1. Check the condition of the engine shutdown relay
  2. Inspect the wiring harness for damage
  3. Check the integrity of the circuit and contacts
  4. Scan the hybrid system control unit for errors
  5. If necessary, replace faulty components

Related codes

P1A00P1A04P0A80

FAQ

What does the P1A03 code mean?

P1A03 is an OBD-II diagnostic trouble code that indicates: Drive Motor 'A' Shutdown Circuit

What causes a P1A03 error code?

The most common causes of P1A03 include: Faulty engine cut-off relay; Open or short circuit in the circuit; Wiring harness damage; Contact corrosion.

How do I fix a P1A03 diagnostic trouble code?

To fix P1A03: Check the condition of the engine shutdown relay. Inspect the wiring harness for damage. Check the integrity of the circuit and contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A03?

Do not drive — repair immediately

How much does it cost to fix P1A03?

The estimated repair cost for P1A03 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat