AutoCodes – Buick – P3043 Buick

P3043 Buick Code - Hybrid/EV Battery Interface Control Module 12 Voltage Sensor Circuit Low Voltage

Quick Answer

The hybrid battery contains 192 individual cells. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface 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: P3043 Buick indicates Hybrid/EV Battery Interface Control Module 12 Voltage Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface 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 902

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 P3043 Buick Description

The hybrid battery contains 192 individual cells. Two cells are welded together in parallel and called a cell group. There are a total of 96 cell groups in the hybrid battery assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cell groups are joined to form 3 distinct sections. The first 24 battery cell groups make up battery section 1. This section is adjacent to the cowl and contains battery cell groups 73 through 96. The next 28 battery cell groups make up battery section 2. This section is located behind section 1 and contains battery cell groups 45 through 72. The transverse battery section is section number 3 and it contains the remaining 44 battery cell groups 1 through 44. The battery sections also contain two temperature sensors, with one sensor located at each end of the section.
The battery energy control module monitors the voltage of the 96 battery cell groups. The voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A voltage sense harness joins this connector to the battery energy control module.
The battery energy control module contains internal interface control modules that monitor specific cell groups.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P3043 Buick - Hybrid/EV Battery Interface Control Module 12 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P3043 Buick Code - Hybrid/EV Battery Interface Control Module 12 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P3043 Buick?

Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC P3043 Buick?

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 P3043 Buick 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 P3043 Buick Code

1. What does the OBDII code P3043 mean for a Buick?

The P3043 code indicates that the Hybrid/EV Battery Interface Control Module has detected a low voltage condition in the 12V sensor circuit.

2. What are the common symptoms of a P3043 code on a Buick?

Symptoms may include reduced hybrid/EV performance, a warning light on the dashboard, and difficulty starting the vehicle.

3. What causes the P3043 code to appear?

Causes can include a faulty 12V battery, damaged wiring or connections, a malfunctioning voltage sensor, or an issue with the battery interface control module.

4. Can I drive my Buick with the P3043 code?

It is not recommended to drive the vehicle with this code, as it could lead to further damage or reduced safety in hybrid/EV systems.

5. How do you diagnose the P3043 code?

Diagnosis involves checking the 12V battery for proper voltage, inspecting wiring and connectors in the voltage sensor circuit, and testing the functionality of the battery interface control module.

6. What repairs can fix the P3043 code on a Buick?

Repairs may include replacing the 12V battery, repairing damaged wiring or connectors, replacing the voltage sensor, or reprogramming or replacing the control module.

7. Can a weak 12V battery cause the P3043 code?

Yes, a weak or failing 12V battery is a common cause of this code and should be tested and replaced if necessary.

8. How much does it cost to fix a P3043 code on a Buick?

Repair costs vary depending on the issue, but replacing a 12V battery typically costs $100â€“$300, while more extensive repairs involving the control module can run $500â€“$1,500 or more.

9. Can I reset the P3043 code without making repairs?

Clearing the code without addressing the root cause may temporarily turn off the warning light, but the issue will likely return and could worsen over time.

10. Is the P3043 code common in all Buick models?

While the code may appear in hybrid or EV Buick models, it is specific to vehicles equipped with a battery interface control module and may not be present in traditional gas-powered models.