AutoCodes – Cadillac – P1B85 Cadillac

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

What does this mean?

What are the Possible Causes of the DTC P1B85 Cadillac?

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

How to Fix the DTC P1B85 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are common symptoms of OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

Common symptoms include reduced electric vehicle range, poor acceleration, and potential difficulty starting the vehicle.

2. What can cause the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

Possible causes include a weak or failing hybrid/electric vehicle battery, loose or corroded electrical connections, or issues with the battery management system.

3. How can I diagnose the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

Diagnosis typically involves using a scan tool to read the code, checking the hybrid/electric vehicle battery voltage levels, inspecting wiring and connections for damage, and testing the battery management system.

4. Can I continue driving with the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

It is not recommended to continue driving with this code as it can lead to further damage to the hybrid/electric vehicle system. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I repair the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

Repair options may include replacing the hybrid/electric vehicle battery, repairing or replacing damaged wiring or connections, and resetting the battery management system.

6. Is it safe to reset the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage on my own?

It is generally safe to clear the code using a scan tool after the underlying issue has been diagnosed and repaired. However, if the problem persists, it is recommended to seek professional help.

7. Are there any preventive maintenance tips to avoid the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

Regularly inspecting and maintaining the hybrid/electric vehicle battery, keeping electrical connections clean and secure, and following the manufacturer's recommended maintenance schedule can help prevent this code from appearing.

8. How much does it typically cost to repair the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

The cost of repair can vary depending on the root cause of the issue, the extent of the damage, and the labor rates of the repair shop. It is best to get a diagnosis and estimate from a qualified technician.

9. Can extreme weather conditions affect the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

Yes, extreme temperatures can impact the performance of the hybrid/electric vehicle battery and lead to issues like low voltage. It is important to take precautions in extreme weather to prevent such problems.

10. How long does it typically take to repair the OBDII code P1B85 Cadillac Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage?

The repair time can vary depending on the complexity of the issue and the availability of parts. Simple fixes like tightening connections may take a short time, while replacing the hybrid/electric vehicle battery could take longer.