AutoCodes – Cadillac – P1B84 Cadillac

P1B84 Cadillac Code - Hybrid/Electric Vehicle Battery 54 Circuit Performance

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: P1B84 Cadillac indicates Hybrid/Electric Vehicle Battery 54 Circuit Performance.
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 840

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 P1B84 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 P1B84 Cadillac - Hybrid/Electric Vehicle Battery 54 Circuit Performance - AutoCodes.com — P1B84 Cadillac Code - Hybrid/Electric Vehicle Battery 54 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B84 Cadillac?

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

How to Fix the DTC P1B84 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 P1B84 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 P1B84 Cadillac Code

1. What does the OBDII code P1B84 mean on a Cadillac?

The P1B84 code indicates an issue with the performance of Circuit 54 in the hybrid or electric vehicle battery system.

2. What are common symptoms of the P1B84 code?

Symptoms may include an illuminated check engine light, reduced hybrid or electric system performance, decreased fuel efficiency, or limited EV mode functionality.

3. What causes the P1B84 code on a Cadillac?

Common causes include a faulty battery sensor, wiring issues in Circuit 54, corroded or loose connections, or a malfunctioning hybrid battery control module.

4. How is the P1B84 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the wiring and connections in Circuit 54, and perform voltage and resistance tests on the hybrid battery system.

5. Can I drive my Cadillac with the P1B84 code active?

It is not recommended to drive with this code active, as it may lead to further damage to the hybrid or electric battery system and reduced vehicle performance.

6. How can I fix the P1B84 code on a Cadillac?

Repairs may involve replacing or repairing damaged wiring, cleaning or tightening battery connections, or replacing the hybrid battery sensor or control module if defective.

7. How much does it cost to repair the P1B84 code?

The cost varies depending on the root cause but can range from $100 for simple wiring repairs to over $1,000 if the hybrid battery control module needs replacement.

8. Can a dead 12V battery cause the P1B84 code?

While unlikely, a weak or dead 12V battery can sometimes affect the hybrid system's diagnostics and trigger various codes, including P1B84.

9. What tools are needed to troubleshoot the P1B84 code?

Youâ€™ll need an OBDII scanner, a multimeter for testing voltage and resistance, and possibly a wiring diagram for Circuit 54 in the hybrid battery system.

10. Is the P1B84 code specific to Cadillacs?

Yes, this code is specific to Cadillac hybrid or electric vehicles and relates to their battery systems.