AutoCodes – GMC – P1B68 GMC

P1B68 GMC Code - Hybrid/Electric Vehicle Battery 44 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: P1B68 GMC indicates Hybrid/Electric Vehicle Battery 44 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 754

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 P1B68 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 P1B68 GMC - Hybrid/Electric Vehicle Battery 44 Circuit High Voltage - AutoCodes.com — P1B68 GMC Code - Hybrid/Electric Vehicle Battery 44 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B68 GMC?

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

How to Fix the DTC P1B68 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 P1B68 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 P1B68 GMC Code

1. What are the common symptoms of OBDII code P1B68 on a GMC hybrid/electric vehicle?

- Common symptoms include reduced power, poor fuel efficiency, and potential issues with the vehicle's hybrid/electric battery.

2. What can cause the OBDII code P1B68 to trigger in a GMC hybrid/electric vehicle?

- This code is usually triggered by high voltage in the battery 44 circuit, indicating a potential issue with the high voltage system.

3. How serious is the OBDII code P1B68 in a GMC hybrid/electric vehicle?

- This code should be taken seriously as it can lead to performance issues and potentially pose a safety risk due to the high voltage involved.

4. How can I diagnose the cause of OBDII code P1B68 on my GMC hybrid/electric vehicle?

- Proper diagnostic tools are required to pinpoint the exact cause, so it's recommended to consult a professional mechanic or dealership with experience in hybrid/electric vehicles.

5. Can I continue driving my GMC hybrid/electric vehicle with OBDII code P1B68 present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the high voltage system.

6. Are there any DIY repair tips for addressing OBDII code P1B68 on a GMC hybrid/electric vehicle?

- DIY repairs are not recommended for this code due to the high voltage involved. It's best to seek professional assistance for proper diagnosis and repair.

7. How much does it typically cost to repair OBDII code P1B68 on a GMC hybrid/electric vehicle?

- The cost of repair can vary depending on the exact cause of the code and any parts that may need to be replaced. It's best to get a professional estimate for an accurate cost.

8. Can resetting the OBDII code P1B68 on my GMC hybrid/electric vehicle make it go away permanently?

- Simply resetting the code without addressing the underlying issue will not make it go away permanently. The root cause of the problem needs to be identified and fixed.

9. Is it safe to attempt to clear the OBDII code P1B68 on my GMC hybrid/electric vehicle using a diagnostic tool?

- It is safe to clear the code using a diagnostic tool, but it's important to address the underlying issue causing the code to prevent it from reoccurring.

10. How often does OBDII code P1B68 occur in GMC hybrid/electric vehicles?

- The frequency of this code can vary, but it is not a common occurrence in GMC hybrid/electric vehicles. If it does occur, it should be addressed promptly.