AutoCodes – Buick – P1A07 Buick

P1A07 Buick Code - Battery Energy Control Module 5 V Reference Circuit

Quick Answer

The drive motor battery contains 288 cells. 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: P1A07 Buick indicates Battery Energy Control Module 5 V Reference 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 853

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 Feb 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A07 Buick Description

The drive motor battery contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the drive motor battery assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 volts, for a nominal system voltage of 355 volts direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 cell groups. 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 serviceable voltage sense harness joins this connector to a drive motor battery high-voltage interface control module, also located on the top surface of the battery section. The drive motor battery high-voltage interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one drive motor battery high-voltage interface control module located on battery sections one and two, and two drive motor battery high-voltage interface control modules associated with battery section three. The drive motor battery high-voltage interface control module, voltage sense harnesses, battery control harness and battery energy control module are all considered serviceable components.
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 hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1A07 Buick - Battery Energy Control Module 5 V Reference Circuit - AutoCodes.com — P1A07 Buick Code - Battery Energy Control Module 5 V Reference Circuit

What does this mean?

What are the Possible Causes of the DTC P1A07 Buick?

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 P1A07 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 P1A07 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 P1A07 Buick Code

1. What does the OBDII code P1A07 mean in a Buick?

The P1A07 code indicates an issue with the Battery Energy Control Module's 5-volt reference circuit, which is crucial for monitoring and managing the hybrid or electric vehicle's battery system.

2. What are the symptoms of a P1A07 code in a Buick?

Symptoms may include a check engine light, reduced fuel efficiency, limited power mode, or difficulty charging the battery in hybrid or electric vehicles.

3. What causes the P1A07 code to appear in a Buick?

Common causes include a malfunctioning Battery Energy Control Module, wiring issues such as shorts or open circuits, or faulty sensors within the 5-volt reference circuit.

4. Can I drive my Buick with a P1A07 code?

Driving with a P1A07 code is not recommended, as it may lead to reduced performance or further damage to the hybrid or electric powertrain system.

5. How is the P1A07 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the 5-volt reference circuit for wiring issues, and test the Battery Energy Control Module and related sensors.

6. What repairs can fix the P1A07 code in a Buick?

Repairs may include replacing damaged wiring, repairing or replacing the Battery Energy Control Module, or replacing a faulty sensor in the 5-volt reference circuit.

7. How much does it cost to fix the P1A07 code in a Buick?

Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 for module replacement, depending on the exact issue.

8. Can a low battery cause the P1A07 code?

While a low battery itself may not directly cause the P1A07 code, issues with the battery or its connections can contribute to voltage irregularities affecting the 5-volt reference circuit.

9. Will disconnecting the battery clear the P1A07 code?

Disconnecting the battery may temporarily clear the code, but it wonâ€™t fix the underlying issue causing the problem, and the code is likely to return.

10. Is the P1A07 code specific to Buicks with hybrid or electric systems?

Yes, the P1A07 code is typically associated with hybrid or electric Buicks, as it relates to the Battery Energy Control Module and high-voltage battery systems.