AutoCodes – GMC – P1B73 GMC

P1B73 GMC 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 GMC 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 1,113

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

What does this mean?

What are the Possible Causes of the DTC P1B73 GMC?

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

How to Fix the DTC P1B73 GMC?

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 GMC 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 P1B73 GMC Code

1. What does the OBDII code P1B73 mean on a GMC vehicle?

P1B73 indicates that the Hybrid/Electric Vehicle Battery 48V circuit is experiencing low voltage, often related to the battery or associated components.

2. What are the common symptoms of the P1B73 code in a GMC?

Symptoms may include a check engine light, reduced hybrid system performance, decreased fuel efficiency, and possible warning messages related to the hybrid system.

3. What causes the P1B73 code to trigger on a GMC vehicle?

Common causes include a faulty 48V hybrid battery, damaged wiring or connectors, a bad voltage sensor, or issues with the hybrid control module.

4. Can I drive my GMC with the P1B73 code active?

Itâ€™s not recommended to drive with this code, as it could lead to further damage in the hybrid system or result in reduced vehicle performance.

5. How is the P1B73 code diagnosed in a GMC?

A technician will use a scan tool to verify the code, inspect the 48V battery and wiring, and test the voltage levels of the hybrid system components.

6. What repairs are typically needed to fix the P1B73 code on a GMC?

Repairs may include replacing the 48V battery, repairing or replacing damaged wiring, or reprogramming or replacing the hybrid control module if necessary.

7. How much does it cost to fix a P1B73 code on a GMC vehicle?

Repair costs vary but can range from $300 to $2,000, depending on whether the issue is a simple wiring repair or a full hybrid battery replacement.

8. Can a weak 12V auxiliary battery cause the P1B73 code on a GMC?

No, this code specifically relates to the 48V hybrid battery circuit and is not directly tied to the 12V auxiliary battery.

9. How can I prevent the P1B73 code from occurring on my GMC?

Regular maintenance of the hybrid system, checking for corroded or damaged wiring, and ensuring proper operation of the 48V battery can help prevent this code.

10. Does the P1B73 code require reprogramming the hybrid control module?

In some cases, reprogramming or replacing the hybrid control module may be necessary if it is determined to be the cause of the low voltage issue.