AutoCodes – Generic – P1B94

P1B94 Code - Hybrid/Electric Vehicle Battery 59 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: P1B94 indicates Hybrid/Electric Vehicle Battery 59 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 912

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 P1B94 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 P1B94 - Hybrid/Electric Vehicle Battery 59 Circuit Low Voltage - AutoCodes.com — P1B94 Code - Hybrid/Electric Vehicle Battery 59 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B94?

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

How to Fix the DTC P1B94?

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 P1B94 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.

Need more information about the P1B94 code?

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Need Help with the Code?

Get the P1B94 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B94 Buick — Hybrid/Electric Vehicle Battery 59 Circuit Low Voltage
P1B94 Cadillac — Hybrid/Electric Vehicle Battery 59 Circuit Low Voltage
P1B94 Chevrolet — Hybrid/Electric Vehicle Battery 59 Circuit Low Voltage
P1B94 GMC — Hybrid/Electric Vehicle Battery 59 Circuit Low Voltage
P1B94 Saturn — Hybrid/Electric Vehicle Battery 59 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 P1B94 Code

1. What does the OBDII code P1B94 mean?

P1B94 indicates a low-voltage issue in the Hybrid/Electric Vehicle Battery 59 circuit, typically tied to monitoring or performance issues in the high-voltage battery system.

2. What are the common symptoms of code P1B94?

Symptoms may include reduced fuel economy, limited power output, an illuminated check engine light, and potential warning messages related to the hybrid or EV system.

3. What causes the P1B94 code to appear?

Common causes include faulty battery cells, damaged wiring in the battery circuit, connector issues, or a malfunctioning battery management system (BMS).

4. Can I still drive my vehicle with a P1B94 code?

While it may be possible to drive, itâ€™s not recommended. A low-voltage issue could lead to additional strain on the battery system and potentially cause further damage.

5. How is the P1B94 code diagnosed?

A technician will use a scan tool to read the code, inspect the battery and circuit wiring, and perform voltage and resistance tests on the affected circuit.

6. What repairs are typically needed for a P1B94 code?

Repairs may involve replacing faulty battery cells, repairing or replacing damaged wiring or connectors, or reprogramming/updating the BMS software.

7. Can a weak 12V auxiliary battery cause the P1B94 code?

While unlikely, a weak 12V battery can sometimes cause communication issues with the BMS, so itâ€™s worth checking the 12V system during diagnostics.

8. How much does it cost to fix the P1B94 code?

Repair costs can vary widely, from inexpensive wiring fixes to costly battery module replacements, depending on the root cause.

9. Could environmental factors trigger the P1B94 code?

Extreme temperatures or excessive moisture could stress the battery or damage wiring, potentially triggering this code.

10. How can I prevent the P1B94 code from occurring?

Regular maintenance, keeping the battery system clean and free of corrosion, and addressing any hybrid system warnings promptly can help prevent this issue.