AutoCodes – Generic – P0B48

P0B48 Code - Hybrid/Electric Vehicle Battery 3 Circuit High 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: P0B48 indicates Hybrid/Electric Vehicle Battery 3 Circuit High 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 4,061

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B48 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 P0B48 - Hybrid/Electric Vehicle Battery 3 Circuit High Voltage - AutoCodes.com — P0B48 Code - Hybrid/Electric Vehicle Battery 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B48?

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

How to Fix the DTC P0B48?

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 P0B48 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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Information for Specific Makes

P0B48 Buick — Hybrid/Electric Vehicle Battery 3 Circuit High Voltage
P0B48 Cadillac — Hybrid/Electric Vehicle Battery 3 Circuit High Voltage
P0B48 Chevrolet — Hybrid/Electric Vehicle Battery 3 Circuit High Voltage
P0B48 GMC — Hybrid/Electric Vehicle Battery 3 Circuit High Voltage
P0B48 Saturn — Hybrid/Electric Vehicle Battery 3 Circuit High Voltage

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 P0B48 Code

1. What are common symptoms of OBDII code P0B48 (Hybrid/Electric Vehicle Battery 3 Circuit High Voltage)?

- Common symptoms include the hybrid/electric vehicle going into a reduced power mode, the vehicle not starting, and the hybrid/electric system warning light being illuminated.

2. What are the possible causes of OBDII code P0B48?

- The code P0B48 can be triggered by issues such as a faulty high voltage battery pack, damaged battery cells, wiring harness issues, or problems with the battery management system.

3. How can I diagnose the cause of OBDII code P0B48?

- Diagnosis typically involves using a scan tool to retrieve the specific fault codes, conducting a visual inspection of the high voltage battery system, and performing voltage and resistance tests on relevant components.

4. Is it safe to drive with OBDII code P0B48 present?

- It is not recommended to drive the vehicle with code P0B48 as it can lead to further damage to the high voltage system and potentially pose safety risks. It is best to have the issue diagnosed and repaired promptly.

5. How can OBDII code P0B48 be repaired?

- Repairing code P0B48 involves addressing the root cause of the issue, which may include replacing a faulty high voltage battery pack, repairing damaged wiring, or recalibrating the battery management system.

6. Can I reset OBDII code P0B48 on my own?

- While you can clear the code using an OBDII scanner, it is important to address the underlying issue causing the fault code to prevent it from reoccurring.

7. Are there any preventive maintenance tips to avoid OBDII code P0B48?

- Regularly inspecting the high voltage battery system, monitoring battery health, and following manufacturer-recommended maintenance schedules can help prevent issues that trigger code P0B48.

8. How much does it typically cost to repair OBDII code P0B48?

- The cost of repairing code P0B48 can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates of the repair shop. It is recommended to obtain quotes from different shops for an accurate estimate.

9. Can OBDII code P0B48 be caused by a simple loose connection?

- Yes, a loose or corroded connection in the high voltage system can trigger code P0B48. It is advisable to check for loose connections and ensure they are properly tightened to see if the issue resolves before proceeding with further diagnostics.

10. Is it possible for OBDII code P0B48 to return after repairs have been made?

- If the underlying issue causing code P0B48 is not fully resolved, or if there are other related issues present, the code may return. It is essential to ensure that the repair is comprehensive and addresses all potential causes to prevent code recurrence.