AutoCodes – Generic – P1A07

P1A07 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 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 3,589

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

What does this mean?

What are the Possible Causes of the DTC P1A07?

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?

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 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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Information for Specific Makes

P1A07 Buick — Battery Energy Control Module 5 V Reference Circuit
P1A07 Cadillac — Battery Energy Control Module 5 V Reference Circuit
P1A07 Chevrolet — Battery Energy Control Module 5 V Reference Circuit
P1A07 Ford — Inverter High Voltage Performance
P1A07 GMC — Battery Energy Control Module 5 V Reference Circuit
P1A07 Lincoln — Inverter High Voltage Performance
P1A07 Mercury — Inverter High Voltage Performance

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 Code

1. What does the OBDII code P1A07 mean?

P1A07 indicates a problem with the Battery Energy Control Module's 5V reference circuit, which can affect the vehicle's hybrid or electric battery management system.

2. What are the common symptoms of code P1A07?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, limited hybrid or EV mode operation, or the vehicle entering a limp mode.

3. What causes the P1A07 code to be triggered?

Common causes include a faulty Battery Energy Control Module, damaged or corroded wiring, a short or open circuit in the 5V reference system, or a malfunctioning sensor connected to the reference circuit.

4. Can a weak 12V battery cause the P1A07 code?

While unlikely, a weak or failing 12V battery can sometimes cause electrical issues, including triggering related codes. Itâ€™s worth testing the battery as part of the diagnosis.

5. How do you diagnose the P1A07 code?

Diagnosis involves using a scan tool to check for related codes, inspecting the 5V reference circuit wiring for damage, testing sensors connected to the circuit, and verifying the Battery Energy Control Module's functionality.

6. Can you drive with the P1A07 code active?

Driving with this code is not recommended, as it can lead to reduced performance, potential battery damage, or the vehicle entering limp mode.

7. How is the P1A07 code fixed?

Repairs may involve replacing damaged wiring, repairing corroded connectors, replacing a faulty sensor, or replacing the Battery Energy Control Module if itâ€™s defective.

8. How much does it cost to repair the P1A07 code?

The repair cost can vary widely, from $100 for minor wiring repairs to over $1,000 if the Battery Energy Control Module needs replacement.

9. Is the P1A07 code specific to hybrid or electric vehicles?

Yes, this code is typically associated with hybrid or electric vehicles, as it relates to the battery management system.

10. Can clearing the code solve the P1A07 issue?

Clearing the code without addressing the underlying issue will not resolve the problem, and the code will likely return once the fault is detected again.