AutoCodes – Saturn – P1B20 Saturn

P1B20 Saturn Code - Hybrid/Electric Vehicle Battery 30 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: P1B20 Saturn indicates Hybrid/Electric Vehicle Battery 30 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 867

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 P1B20 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 P1B20 Saturn - Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage - AutoCodes.com — P1B20 Saturn Code - Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B20 Saturn?

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

How to Fix the DTC P1B20 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 P1B20 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 P1B20 Saturn Code

1. What are the common symptoms of OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- Common symptoms include reduced hybrid/electric vehicle performance, decreased fuel efficiency, and potential issues with the high-voltage battery system.

2. What are the possible causes of OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- The code P1B20 can be triggered by issues such as a faulty battery cell, damaged battery wiring, a failed battery management system, or an issue with the battery cooling system.

3. How can I diagnose the OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- Diagnosis typically involves using a professional OBDII scanner to read the specific fault code, inspecting the high-voltage battery system for any visible damage, and testing the battery cells and related components for proper functionality.

4. Can driving with OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage cause further damage?

- Continuing to drive with this code present can potentially cause further damage to the high-voltage battery system, leading to more severe issues and possibly even rendering the vehicle inoperable.

5. How can I repair OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- Repairing this code typically involves addressing the root cause of the issue, which may include replacing a faulty battery cell, repairing damaged wiring, recalibrating the battery management system, or servicing the cooling system.

6. Is it safe to attempt DIY repairs for OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- Due to the high-voltage nature of the components involved, it is recommended to seek professional help or take the vehicle to a certified hybrid/electric vehicle technician for repairs related to code P1B20.

7. How much does it cost to fix OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- The cost of fixing this code can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates of the repair facility. It is advisable to obtain quotes from different service providers.

8. Will resetting the OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage make it go away permanently?

- Simply resetting the code without addressing the underlying issue will not make it go away permanently. The root cause must be diagnosed and repaired to prevent the code from reoccurring.

9. Can extreme weather conditions affect OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- Yes, extreme temperatures can impact the performance and health of the high-voltage battery system, potentially leading to issues like low voltage in the circuit triggering the P1B20 code.

10. How often should I have the high-voltage battery system inspected to prevent OBDII code P1B20 (Saturn) Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage?

- It is recommended to have the high-voltage battery system inspected regularly as part of routine maintenance for hybrid/electric vehicles to detect any potential issues early and prevent codes like P1B20 from appearing.