OBD Guide
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P1A9E

Starter/Generator Inverter Phase U Overtemperature

P1A9E is an OBD-II diagnostic trouble code meaning: Starter/Generator Inverter Phase U Overtemperature. Common causes: inverter overload, inverter cooling system malfunction. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Warning light on dashboard
  • Reduced efficiency of the regenerative braking system
  • Problems starting the engine
  • Hybrid system power reduction
  • The car goes into emergency mode

Causes

  • Inverter overload
  • Inverter cooling system malfunction
  • Problems with wiring or contacts
  • Defect of the inverter itself
  • Problems with control software

How to Fix

  1. Check the inverter cooling system
  2. Diagnose the condition of wiring and contacts
  3. Check the functionality of the inverter
  4. Update control unit software
  5. Replace the inverter if necessary

Related codes

P1A9FP1A9DP0A7D

FAQ

What does the P1A9E code mean?

P1A9E is an OBD-II diagnostic trouble code that indicates: Starter/Generator Inverter Phase U Overtemperature

What causes a P1A9E error code?

The most common causes of P1A9E include: Inverter overload; Inverter cooling system malfunction; Problems with wiring or contacts; Defect of the inverter itself.

How do I fix a P1A9E diagnostic trouble code?

To fix P1A9E: Check the inverter cooling system. Diagnose the condition of wiring and contacts. Check the functionality of the inverter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A9E?

Do not drive — repair immediately

How much does it cost to fix P1A9E?

The estimated repair cost for P1A9E is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat