AutoCodes – GMC – P0ADD GMC

P0ADD GMC Code - Hybrid/EV Battery Negative Contactor Control Circuit

Quick Answer

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. 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: P0ADD GMC indicates Hybrid/EV Battery Negative Contactor Control Circuit.
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 1,089

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 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0ADD GMC Description

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors and transistors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 5 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor and multi-function high voltage contactor. The 2 transistors consist of the precharge transistor and heater transistor. The contactors and transistors 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 the high voltage contactors/transistors. Ground is provided through the case ground.

OBDII Code P0ADD GMC - Hybrid/EV Battery Negative Contactor Control Circuit - AutoCodes.com — P0ADD GMC Code - Hybrid/EV Battery Negative Contactor Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0ADD GMC?

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 P0ADD GMC?

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 P0ADD GMC 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.

Frequently Asked Questions about P0ADD GMC Code

1. What are the common symptoms of OBDII code P0ADD GMC (Hybrid/EV Battery Negative Contactor Control Circuit)?

Symptoms may include a warning light on the dashboard, reduced hybrid system performance, difficulty starting the vehicle, and potential issues with battery charging.

2. What are the possible causes of the Hybrid/EV Battery Negative Contactor Control Circuit code?

Possible causes include a faulty negative contactor, issues with the control circuit wiring, a defective hybrid battery, or problems with the battery management system.

3. How can I diagnose the Hybrid/EV Battery Negative Contactor Control Circuit issue?

Diagnosis typically involves using a scan tool to read the OBDII code, inspecting the negative contactor and related wiring, testing the hybrid battery, and checking for any loose connections or corrosion.

4. What are the repair options for addressing OBDII code P0ADD GMC?

Repair options may include replacing the negative contactor, repairing damaged wiring, resetting the fault codes, recalibrating the hybrid system, or seeking professional assistance from a certified technician.

5. Can I continue driving my vehicle with the Hybrid/EV Battery Negative Contactor Control Circuit code?

It is not recommended to continue driving the vehicle with this code as it may lead to further damage to the hybrid system and potentially result in a loss of power or complete shutdown while driving.

6. How much does it typically cost to repair the Hybrid/EV Battery Negative Contactor Control Circuit issue?

The cost of repair can vary depending on the specific cause of the problem, parts needed, labor rates, and whether the repair is done at a dealership or an independent repair shop. It is advisable to get a few quotes for comparison.

7. Are there any preventive maintenance tips to avoid the Hybrid/EV Battery Negative Contactor Control Circuit code?

Regularly inspecting the hybrid system components, keeping the battery well-maintained, avoiding extreme temperature conditions, and following the manufacturer's recommended maintenance schedule can help prevent such issues.

8. Can a DIY enthusiast fix the Hybrid/EV Battery Negative Contactor Control Circuit problem?

While some basic troubleshooting and inspections can be done by a DIY enthusiast, repairing or replacing components related to the hybrid system should be left to experienced professionals due to the complexity and safety considerations.

9. Will resetting the OBDII code make the Hybrid/EV Battery Negative Contactor Control Circuit issue go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear once the system detects the problem again. It is important to diagnose and fix the root cause.

10. How long does it typically take to repair the Hybrid/EV Battery Negative Contactor Control Circuit issue?

The repair time can vary depending on the extent of the problem, availability of parts, and the expertise of the technician. It is advisable to consult with a professional to get an accurate estimate of the repair duration.