AutoCodes – GMC – P1BEC GMC

P1BEC GMC Code - Hybrid/Electric Vehicle Battery 88 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: P1BEC GMC indicates Hybrid/Electric Vehicle Battery 88 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 1,000

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1BEC 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 P1BEC GMC - Hybrid/Electric Vehicle Battery 88 Circuit High Voltage - AutoCodes.com — P1BEC GMC Code - Hybrid/Electric Vehicle Battery 88 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BEC GMC?

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

How to Fix the DTC P1BEC 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 P1BEC 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 P1BEC GMC Code

1. What does the OBDII code P1BEC on a GMC mean?

The P1BEC code indicates an issue with the Hybrid/Electric Vehicle Battery 88 Circuit, specifically a high voltage problem.

2. What are the common symptoms of a P1BEC code in a GMC vehicle?

Symptoms may include warning lights on the dashboard, reduced hybrid system performance, difficulty starting the vehicle, or the vehicle switching to reduced power mode.

3. What causes the P1BEC code to appear in GMC vehicles?

Common causes include issues with the battery wiring harness, a faulty battery control module, damaged battery cells, or corrosion in the high-voltage connectors.

4. Can I drive my GMC with a P1BEC code?

Driving with a P1BEC code is not recommended, as it may lead to further damage in the hybrid system or cause the vehicle to enter limp mode, reducing performance.

5. How can I diagnose the P1BEC code on my GMC?

Diagnosis typically involves scanning the vehicle with an advanced OBDII scanner, inspecting the high-voltage wiring and connectors, and testing the hybrid battery and control module.

6. What repairs are commonly needed to fix the P1BEC code?

Repairs may include replacing damaged wiring, repairing or replacing the battery control module, cleaning corroded connectors, or replacing faulty battery cells.

7. How much does it cost to fix a P1BEC code on a GMC?

The repair cost varies widely based on the root cause, ranging from $200 for minor wiring fixes to over $1,000 for battery module or cell replacement.

8. Can a weak 12-volt battery trigger the P1BEC code in GMC hybrid vehicles?

While unlikely, a weak 12-volt battery can sometimes cause communication issues in the hybrid system, which may indirectly trigger related codes.

9. How do I prevent the P1BEC code from reoccurring in my GMC?

Regular maintenance of the hybrid system, checking for corrosion in connectors, and ensuring the battery and wiring are in good condition can help prevent this code.

10. Is the P1BEC code covered under warranty for GMC vehicles?

In many cases, hybrid battery and control module issues may be covered under the manufacturerâ€™s warranty, but itâ€™s best to check your specific warranty terms.