AutoCodes – Saturn – P0B65 Saturn

P0B65 Saturn Code - Hybrid/Electric Vehicle Battery 9 Circuit Low Voltage

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: P0B65 Saturn indicates Hybrid/Electric Vehicle Battery 9 Circuit Low Voltage.
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 937

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 P0B65 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 P0B65 Saturn - Hybrid/Electric Vehicle Battery 9 Circuit Low Voltage - AutoCodes.com — P0B65 Saturn Code - Hybrid/Electric Vehicle Battery 9 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B65 Saturn?

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

How to Fix the DTC P0B65 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 P0B65 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 P0B65 Saturn Code

1. What does OBDII code P0B65 mean on a Saturn?

Code P0B65 indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 9 Circuit, typically related to one of the battery modules or its associated wiring.

2. What are the common symptoms of P0B65 in a Saturn?

Common symptoms include reduced fuel efficiency, limited power output, illuminated check engine or hybrid system warning lights, and possibly the vehicle entering "limp mode."

3. What causes the P0B65 code to appear?

The code can be triggered by faulty wiring, a failing battery module, corroded connectors, or a malfunction in the hybrid battery control module.

4. Can I still drive my Saturn with a P0B65 code?

It is possible to drive, but it is not recommended as the hybrid system may not perform optimally, and ignoring the issue could lead to further damage.

5. How is the P0B65 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the battery circuits, check for loose or corroded connections, and test the voltage of the affected battery module.

6. What repairs are needed to fix the P0B65 code?

Repairs may include replacing a faulty battery module, repairing or replacing damaged wiring, cleaning or reconnecting corroded terminals, or reprogramming the hybrid control module.

7. How much does it cost to fix a P0B65 code on a Saturn?

The cost depends on the exact issue, but repairs can range from $200 for wiring fixes to over $1,000 if a hybrid battery module needs replacement.

8. Can a dead 12V battery cause a P0B65 code?

No, the P0B65 code specifically relates to the high-voltage hybrid battery system, not the 12V auxiliary battery.

9. How can I prevent the P0B65 code from recurring?

Regular maintenance of the hybrid battery system, including inspections of wiring and connectors, can help prevent this code from recurring.

10. Does the P0B65 code mean the entire hybrid battery needs replacement?

Not necessarily. The issue may be isolated to a single module or circuit, and the entire battery pack may not need replacement unless it is severely degraded.