AutoCodes – Cadillac – P1B20 Cadillac

P1B20 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 834

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P1B20 Cadillac?

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

How to Fix the DTC P1B20 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 P1B20 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.

Need more information about the P1B20 Cadillac code?

Need more information on how to fix the P1B20 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B20 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 Cadillac Code

1. What are some common symptoms of OBDII code P1B20 in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced electric vehicle range, poor battery performance, and potential warning lights on the dashboard.

2. What could cause the Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage error code in a Cadillac?

- Causes may include a faulty hybrid/electric vehicle battery, issues with the battery management system, or problems with the charging system.

3. How serious is the P1B20 error code in a Cadillac Hybrid/Electric Vehicle?

- The P1B20 code should be addressed promptly to prevent further damage to the hybrid/electric vehicle battery and ensure optimal performance.

4. Can I continue driving my Cadillac if the P1B20 code appears?

- It is not recommended to continue driving the vehicle when the P1B20 code is present, as it can lead to reduced efficiency and potential battery issues.

5. What are some DIY repair tips for fixing the Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage code?

- DIY repair tips may include checking the battery connections, inspecting the battery for damage, and ensuring proper charging system functionality.

6. How can I reset the OBDII code P1B20 in a Cadillac Hybrid/Electric Vehicle?

- The code can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the error code.

7. Is it safe to drive the Cadillac in gasoline mode if the P1B20 code is triggered?

- It is generally safe to drive the vehicle in gasoline mode if the P1B20 code appears, but it is advisable to have the issue diagnosed and repaired promptly.

8. Can a faulty sensor trigger the P1B20 error code in a Cadillac Hybrid/Electric Vehicle?

- Yes, a faulty sensor related to the battery circuit or management system can potentially trigger the P1B20 error code.

9. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 30 Circuit Low Voltage issue in a Cadillac?

- Repair costs can vary depending on the root cause of the issue, but they may range from a few hundred to a few thousand dollars, including parts and labor.

10. Are there any recalls or service bulletins related to the P1B20 code in Cadillac Hybrid/Electric Vehicles?

- It is recommended to check with a Cadillac dealership or the manufacturer for any recalls or service bulletins related to the P1B20 code to see if the repair may be covered under warranty.