AutoCodes – Saturn – P0AA4 Saturn

P0AA4 Saturn Code - Hybrid/EV Battery Negative Contactor Circuit Stuck Closed

Quick Answer

The hybrid/EV battery contains 4 high voltage contactors and 1 solid state relay (transistor). Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module 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: P0AA4 Saturn indicates Hybrid/EV Battery Negative Contactor Circuit Stuck Closed.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module 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 959

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 Apr 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0AA4 Saturn Description

The hybrid/EV battery contains 4 high voltage contactors and 1 solid state relay (transistor). The high voltage contactors and transistor allow the high voltage DC batteries to be connected to the vehicle or contain the high voltage DC within the hybrid/EV battery assembly. The 4 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor and a precharge negative high voltage contactor. The transistor controls the battery heater high voltage positive circuit. The contactors and transistor close and open in a specific sequence controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for each high voltage contactor/transistor. Ground is provided through a vehicle ground external of the high voltage battery.

OBDII Code P0AA4 Saturn - Hybrid/EV Battery Negative Contactor Circuit Stuck Closed - AutoCodes.com — P0AA4 Saturn Code - Hybrid/EV Battery Negative Contactor Circuit Stuck Closed

What does this mean?

What are the Possible Causes of the DTC P0AA4 Saturn?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC P0AA4 Saturn?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0AA4 Saturn 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.

Need more information about the P0AA4 Saturn code?

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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.

Frequently Asked Questions about P0AA4 Saturn Code

What does the OBDII code P0AA4 indicate for my Saturn?

The OBDII code P0AA4 indicates that there is an issue with the hybrid or electric vehicle battery negative contactor circuit, which is stuck in the closed position.

What are the common symptoms of the P0AA4 code?

Common symptoms include reduced power, warning lights on the dashboard, and the vehicle may not start or operate properly due to the battery contactor issue.

What could cause the P0AA4 code to trigger?

Causes can include a faulty battery contactor, wiring issues, problems with the battery management system, or a failed hybrid control module.

How can I diagnose the P0AA4 code?

Start by using an OBDII scanner to confirm the code and check for other related codes. Inspect the wiring and connectors for damage, and test the battery contactor for proper operation.

Is it safe to drive my Saturn with the P0AA4 code?

It is not recommended to drive the vehicle with this code, as it may lead to safety issues or further damage to the hybrid system.

What repairs are typically needed for the P0AA4 code?

Repairs may involve replacing the faulty contactor, repairing damaged wiring, or addressing issues with the control module or battery management system.

Can I reset the P0AA4 code after repairs?

Yes, after performing the necessary repairs, you can use an OBDII scanner to clear the code. However, ensure that the underlying issue has been resolved to prevent the code from returning.

How much does it typically cost to fix the P0AA4 code?

Repair costs can vary widely depending on the specific issue, but it may range from a few hundred dollars for wiring repairs to over a thousand dollars for replacing the contactor or control module.

Are there any DIY solutions for the P0AA4 code?

While some basic inspections and wiring checks can be done at home, it is often best to consult a professional mechanic, especially for hybrid systems, to ensure safety and proper repair.