AutoCodes – Saturn – P0B74 Saturn

P0B74 Saturn Code - Hybrid/Electric Vehicle Battery 12 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: P0B74 Saturn indicates Hybrid/Electric Vehicle Battery 12 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 987

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B74 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 P0B74 Saturn - Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage - AutoCodes.com — P0B74 Saturn Code - Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B74 Saturn?

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

How to Fix the DTC P0B74 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 P0B74 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 P0B74 Saturn Code

1. What does the OBDII code P0B74 indicate on a Saturn?

The code P0B74 indicates that there is a low voltage issue in the 12-volt circuit of the hybrid/electric vehicle battery system. This can affect the vehicle's ability to start or maintain efficient operation.

2. What are the common symptoms of the P0B74 code in a Saturn?

Symptoms may include a check engine light, reduced vehicle performance, inability to start, unexpected battery drain, or issues with the auxiliary systems powered by the 12-volt battery.

3. What could cause the P0B74 code to appear on my Saturn?

Possible causes include a failing 12-volt battery, poor battery connections, a malfunctioning battery management system, or issues with the vehicleâ€™s charging system.

4. How can I troubleshoot the P0B74 code on my Saturn?

Start by checking the 12-volt battery's health and connections. Look for corrosion on terminals, ensure connections are tight, and test the batteryâ€™s charge level and load capability. Also, inspect the wiring and connectors for damage or corrosion.

5. What are the repair steps for fixing the P0B74 code on a Saturn?

Repairing this code could involve replacing the 12-volt battery if it is found to be defective, repairing or replacing any damaged cables or connectors, or servicing the battery management system if it is malfunctioning.

6. Is it safe to drive my Saturn with the P0B74 code?

Driving with this code is not advisable as it indicates a problem with the vehicle's electrical system, which could lead to a breakdown or inability to start the vehicle.

7. How urgent is it to fix the P0B74 code on a Saturn?

It is fairly urgent to address this issue to ensure reliable vehicle operation and prevent potential damage to the electrical system or hybrid battery.

8. Can the P0B74 code affect the overall battery life of my Saturn?

Yes, unresolved issues leading to the P0B74 code can strain the hybrid system and the 12-volt battery, potentially shortening the lifespan of the battery and affecting other electrical components.

9. What tools are required to diagnose the P0B74 code on a Saturn?

A professional OBDII scanner, a multimeter, and a battery load tester are essential tools for diagnosing this issue comprehensively.

10. Could the P0B74 code be a sign of other issues in the hybrid system of my Saturn?

While the code specifically relates to the 12-volt battery circuit, it could be indicative of broader issues in the hybrid system's battery management or charging systems, warranting a thorough inspection.