AutoCodes – Saturn – P1B85 Saturn

P1B85 Saturn Code - Hybrid/Electric Vehicle Battery 54 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: P1B85 Saturn indicates Hybrid/Electric Vehicle Battery 54 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 730

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 P1B85 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 P1B85 Saturn - Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage - AutoCodes.com — P1B85 Saturn Code - Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B85 Saturn?

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

How to Fix the DTC P1B85 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 P1B85 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 P1B85 Saturn Code

1. What are the common symptoms of OBDII code P1B85 in a Saturn Hybrid/Electric Vehicle?

- Common symptoms include reduced battery performance, decreased fuel efficiency, and potential warning lights on the dashboard.

2. What could cause the Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage code (P1B85) in a Saturn?

- The code P1B85 can be triggered by issues such as a faulty battery pack, damaged battery modules, loose electrical connections, or a problem with the battery management system.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage code in my Saturn?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, inspecting the battery pack and related components for visible damage, and checking the electrical connections for any loose or corroded terminals.

4. Can I drive my Saturn with the P1B85 code present?

- It is not recommended to drive the vehicle with the code P1B85 present, as it can lead to further damage to the battery system and potentially affect the overall performance of the vehicle.

5. What are some repair tips for addressing the P1B85 code in a Saturn Hybrid/Electric Vehicle?

- Repair tips may include checking and tightening all electrical connections, inspecting the battery pack for any visible damage, testing the battery modules, and resetting the battery management system.

6. Is it possible to reset the P1B85 code without fixing the underlying issue?

- While clearing the code temporarily may be possible, it is crucial to address the root cause of the problem to prevent it from reoccurring and potentially causing more severe issues in the future.

7. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage code in a Saturn?

- The cost of repair can vary depending on the specific issue causing the code, the extent of the damage, and whether any components need to be replaced. It is recommended to consult with a qualified mechanic for an accurate estimate.

8. Can a DIY enthusiast fix the P1B85 code in a Saturn Hybrid/Electric Vehicle?

- Some basic troubleshooting steps, such as checking connections and inspecting for visible damage, can be performed by DIY enthusiasts. However, more complex issues may require the expertise of a professional mechanic with experience in hybrid/electric vehicle systems.

9. Are there any preventive measures I can take to avoid triggering the P1B85 code in my Saturn?

- Regular maintenance of the hybrid/electric vehicle system, monitoring the battery performance, and addressing any warning signs promptly can help prevent issues that may lead to the P1B85 code.

10. Is the P1B85 code specific to Saturn vehicles, or can it occur in other hybrid/electric vehicles as well?

- The P1B85 code specifically relates to Saturn vehicles, but similar codes related to low voltage in the hybrid/electric vehicle battery system may be present in other makes and models.