AutoCodes – Toyota – P0A1A Toyota

P0A1A Toyota Code - Generator Control Module

Quick Answer

The MG ECU performs many diagnostic tests to verify proper operation of internal ECU systems. Common causes include Faulty Inverter with converter assembly, Inverter with converter assembly harness is open or shorted, Inverter with converter assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0A1A Toyota indicates Generator Control Module.
Common causes: Common causes include Faulty Inverter with converter assembly, Inverter with converter assembly harness is open or shorted, Inverter with converter assembly circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 11,287

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P0A1A Toyota Description

The MG ECU performs many diagnostic tests to verify proper operation of internal ECU systems. In one of those tests, the MG ECU checks the result of the generator CPU self-test. If the MG ECU detects a "Fail" from the generator CPU self-test, it will conclude that there is an internal malfunction in the generator CPU. The power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

OBDII Code P0A1A Toyota - Generator Control Module - AutoCodes.com — P0A1A Toyota Code - Generator Control Module

What does this mean?

What are the Possible Causes of the DTC P0A1A Toyota?

Faulty Inverter with converter assembly
Inverter with converter assembly harness is open or shorted
Inverter with converter assembly circuit poor electrical connection

How to Fix the DTC P0A1A Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Toyota recently released a warranty enhancement for 2010-2014 Prius, extending the coverage of the inverter/converter Intelligent Powertrain Module.

Toyota Bulletin Information:
Toyota has received some reports where the Intelligent Power Module (IPM) located inside the inverter assembly of the hybrid system may fail. This condition is indicated by hybrid system diagnostic trouble codes (DTCs): P0A94, P324E, P3004, and/or P0A1A. If one or more of these DTCs are detected, various warning lamps on the instrument panel will also illuminate and the vehicle will enter fail safe mode.
Although the Hybrid Inverter assembly is covered by Toyota's New Vehicle Limited Warranty for 8 years or 100,000 miles (whichever occurs first), we at Toyota care about the customers' ownership experience. Toyota is now extending the warranty coverage for repairs related to failure of the Intelligent Power Module (IPM).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0A1A Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.