AutoCodes – Generic – P1B73

P1B73 Code - Hybrid/Electric Vehicle Battery 48 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: P1B73 indicates Hybrid/Electric Vehicle Battery 48 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 1,827

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 P1B73 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 P1B73 - Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage - AutoCodes.com — P1B73 Code - Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B73?

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

How to Fix the DTC P1B73?

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 P1B73 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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Need Help with the Code?

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Information for Specific Makes

P1B73 Buick — Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage
P1B73 Cadillac — Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage
P1B73 Chevrolet — Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage
P1B73 GMC — Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage
P1B73 Saturn — Hybrid/Electric Vehicle Battery 48 Circuit Low 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 P1B73 Code

1. What are the common symptoms of OBDII code P1B73 (Hybrid/Electric Vehicle Battery 48 Circuit Low Voltage)?

- The common symptoms include reduced electric vehicle range, poor fuel efficiency, and potential issues with starting the vehicle.

2. What are the possible causes of OBDII code P1B73?

- The code P1B73 can be triggered by a weak or failing battery, issues with the battery management system, damaged wiring, or problems with the battery control module.

3. How can I diagnose the cause of OBDII code P1B73?

- To diagnose the cause of P1B73, it is recommended to perform a thorough inspection of the hybrid/electric vehicle battery, check for any visible damage to wiring or connectors, and use a diagnostic scanner to retrieve additional fault codes.

4. Can I still drive my vehicle with OBDII code P1B73 present?

- It is not recommended to drive your vehicle with the P1B73 code present, as it can lead to further damage to the hybrid/electric vehicle battery system and potentially result in a complete loss of power.

5. How can I repair OBDII code P1B73?

- Repairing the P1B73 code may involve replacing the hybrid/electric vehicle battery, repairing any damaged wiring or connectors, resetting the battery management system, or recalibrating the battery control module.

6. Are there any safety concerns associated with OBDII code P1B73?

- Yes, there are safety concerns associated with P1B73, as low voltage in the hybrid/electric vehicle battery can affect the overall performance and reliability of the vehicle, potentially leading to unsafe driving conditions.

7. How much does it typically cost to repair OBDII code P1B73?

- The cost of repairing P1B73 can vary depending on the extent of the damage and the specific components that need to be replaced or repaired. It is advisable to consult with a professional mechanic for an accurate cost estimate.

8. Can OBDII code P1B73 be a recurring issue?

- Yes, P1B73 can be a recurring issue if the underlying cause of the low voltage in the hybrid/electric vehicle battery is not properly addressed during the repair process.

9. Will resetting the OBDII code P1B73 make it go away permanently?

- Resetting the P1B73 code may temporarily clear the fault code, but if the root cause of the low voltage issue is not fixed, the code is likely to reappear.

10. How can I prevent OBDII code P1B73 from occurring in the future?

- To prevent the recurrence of P1B73, it is important to regularly maintain the hybrid/electric vehicle battery, address any warning signs promptly, and follow the manufacturer's recommended maintenance schedule for the vehicle's electrical system.