AutoCodes – Saturn – P1B72 Saturn

P1B72 Saturn Code - Hybrid/Electric Vehicle Battery 48 Circuit Performance

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. 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: P1B72 Saturn indicates Hybrid/Electric Vehicle Battery 48 Circuit Performance.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
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 779

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 Mar 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B72 Saturn Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack 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 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 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring 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 P1B72 Saturn - Hybrid/Electric Vehicle Battery 48 Circuit Performance - AutoCodes.com — P1B72 Saturn Code - Hybrid/Electric Vehicle Battery 48 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B72 Saturn?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P1B72 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 P1B72 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.

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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 P1B72 Saturn Code

What does the OBDII code P1B72 mean for a Saturn?

The P1B72 code indicates a problem with the Hybrid/Electric Vehicle Battery 48 Circuit Performance, often related to the battery or its associated systems.

What are the common symptoms of the P1B72 code?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, limited hybrid or electric vehicle performance, and potential warning messages on the dashboard.

What causes the P1B72 code to appear?

The code can be triggered by issues such as a faulty battery cell, damaged wiring or connectors in the battery circuit, or a malfunctioning battery management system.

Can the P1B72 code damage the vehicle if ignored?

Yes, ignoring this code can lead to further damage to the hybrid battery system, reduced vehicle performance, and potentially higher repair costs.

How is the P1B72 code diagnosed?

A mechanic will use a scan tool to retrieve the code, inspect the battery and its connections, and test the circuit performance to pinpoint the issue.

Can a loose connection cause the P1B72 code?

Yes, loose or corroded wiring and connectors in the battery circuit can trigger this code.

Is the P1B72 code specific to Saturn hybrid vehicles?

While the P1B72 code is commonly associated with Saturn hybrid or electric vehicles, it can apply to other makes and models with similar systems.

What repairs are typically needed to fix the P1B72 code?

Repairs may include replacing a faulty battery module, repairing damaged wiring, or recalibrating the battery management system.

How much does it cost to fix the P1B72 code?

Repair costs can vary widely but may range from $200 to over $1,000, depending on the specific issue and parts required.

Can a software update resolve the P1B72 code?

In some cases, a software update for the battery management system may resolve the issue, but this depends on the vehicle and the nature of the problem.