AutoCodes – Saturn – P0B40 Saturn

P0B40 Saturn Code - Hybrid/Electric Vehicle Battery 2 Circuit

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: P0B40 Saturn indicates Hybrid/Electric Vehicle Battery 2 Circuit.
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 778

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B40 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 P0B40 Saturn - Hybrid/Electric Vehicle Battery 2 Circuit - AutoCodes.com — P0B40 Saturn Code - Hybrid/Electric Vehicle Battery 2 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B40 Saturn?

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

How to Fix the DTC P0B40 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 P0B40 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 P0B40 Saturn Code

What does the OBDII code P0B40 indicate for a Saturn vehicle?

The P0B40 code indicates a problem with the Hybrid/Electric Vehicle Battery 2 Circuit, which affects the performance of the hybrid battery system.

What are common symptoms of the P0B40 code?

Common symptoms include reduced hybrid system performance, warning lights on the dashboard, and possible issues with vehicle acceleration.

What could cause the P0B40 code to appear?

Causes may include damaged wiring or connectors in the battery circuit, a malfunctioning battery management system, or issues with the hybrid battery itself.

How can I diagnose the P0B40 code?

You can diagnose this code by using an OBDII scanner to read the code, inspecting the battery circuit wiring, and checking the battery management system for faults.

What repairs are typically needed to fix the P0B40 code?

Repairs may involve replacing damaged wiring or connectors, repairing or replacing components in the battery management system, or replacing the hybrid battery if it is faulty.

Is it safe to drive a vehicle with the P0B40 code?

It is generally not recommended to drive the vehicle with this code, as it may lead to further damage to the hybrid system or reduced vehicle performance.

How can I prevent the P0B40 code from reappearing after repairs?

Regular maintenance of the hybrid battery system, including checking connections and ensuring the battery is properly charged, can help prevent the code from reoccurring.

Will clearing the P0B40 code fix the problem?

Clearing the code will not fix the underlying issue; it is essential to diagnose and repair the root cause before clearing the code.

Can a bad battery sensor cause the P0B40 code?

Yes, a malfunctioning battery sensor can lead to inaccurate readings and trigger the P0B40 code, as it affects the battery management system's ability to monitor the battery.

How much does it typically cost to repair the issue related to the P0B40 code?

Repair costs can vary widely based on the specific issue, but they can range from a few hundred dollars for wiring repairs to several thousand dollars for battery replacement.