AutoCodes – Cadillac – P1B94 Cadillac

P1B94 Cadillac 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 Cadillac 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 888

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

What does this mean?

What are the Possible Causes of the DTC P1B94 Cadillac?

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

How to Fix the DTC P1B94 Cadillac?

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 Cadillac 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 P1B94 Cadillac Code

1. What does the OBDII code P1B94 mean on a Cadillac?

The P1B94 code indicates a "Hybrid/Electric Vehicle Battery 59 Circuit Low Voltage," meaning the vehicle's hybrid or EV battery circuit is experiencing a low voltage issue in cell 59.

2. What are the common symptoms of code P1B94 in a Cadillac?

Symptoms can include reduced fuel efficiency, limited electric driving range, a hybrid system warning light on the dashboard, or difficulty starting the vehicle.

3. What causes the P1B94 code to appear?

This code is typically caused by a faulty battery cell, wiring issues, corroded connections, or a malfunctioning battery control module.

4. Can you drive a Cadillac with the P1B94 code?

Driving with this code is not recommended as it can lead to reduced performance or further damage to the hybrid/electric battery system.

5. How is the P1B94 code diagnosed?

A technician will use a scan tool to check for additional trouble codes, inspect the battery pack and wiring, and measure the voltage of the affected circuit to confirm the issue.

6. What repairs can fix the P1B94 code?

Repairs may include replacing the faulty battery cell, repairing or replacing damaged wiring, cleaning corroded terminals, or reprogramming the battery control module.

7. How much does it cost to fix the P1B94 code on a Cadillac?

Repair costs vary depending on the issue, but replacing a hybrid battery cell can range from $500 to $2,000, while wiring repairs may cost less.

8. Can a weak 12V battery trigger the P1B94 code?

No, this code specifically relates to the high-voltage hybrid/electric battery system, not the 12V auxiliary battery.

9. Is the P1B94 code covered under warranty?

Hybrid battery components are often covered under specific extended warranties, so check your vehicleâ€™s warranty terms for coverage.

10. Can I reset the P1B94 code without repairs?

Resetting the code without addressing the underlying issue may clear the warning temporarily, but the problem is likely to return and could cause further damage.