AutoCodes – Cadillac – P1B61 Cadillac

P1B61 Cadillac Code - Hybrid/Electric Vehicle Battery 42 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: P1B61 Cadillac indicates Hybrid/Electric Vehicle Battery 42 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 1,341

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 P1B61 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 P1B61 Cadillac - Hybrid/Electric Vehicle Battery 42 Circuit Low Voltage - AutoCodes.com — P1B61 Cadillac Code - Hybrid/Electric Vehicle Battery 42 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B61 Cadillac?

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

How to Fix the DTC P1B61 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 P1B61 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 P1B61 Cadillac Code

1. What does the OBDII code P1B61 mean on a Cadillac?

The P1B61 code indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 42 circuit, which is part of the high-voltage battery monitoring system.

2. What are the symptoms of the P1B61 code on a Cadillac?

Common symptoms include reduced performance, warning lights on the dashboard (such as the Check Engine Light or hybrid system warning), and possible issues with the vehicle's hybrid or electric drive system.

3. What causes the P1B61 code on a Cadillac?

Possible causes include a faulty battery cell, poor electrical connections, damaged wiring in the circuit, a failing battery energy control module, or corrosion in the connectors.

4. Can I drive my Cadillac with the P1B61 code present?

Driving with the P1B61 code is not recommended, as it may lead to reduced performance or further damage to the hybrid or electric system components.

5. How is the P1B61 code diagnosed on a Cadillac?

Diagnosis involves scanning for additional codes, inspecting the high-voltage battery and its wiring, testing the voltage in circuit 42, and checking for poor connections or damaged components.

6. What repairs can fix the P1B61 code on a Cadillac?

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

7. How much does it cost to fix the P1B61 code on a Cadillac?

Repair costs vary depending on the issue but can range from $200 for wiring repairs to $1,000 or more for battery-related component replacements.

8. Can a dead 12V battery trigger the P1B61 code on a Cadillac?

No, the P1B61 code specifically relates to the high-voltage battery circuit and is not caused by the 12V battery.

9. Will clearing the code fix the P1B61 issue on a Cadillac?

Clearing the code may temporarily remove the warning, but the underlying issue must be repaired to prevent the code from returning.

10. Can I fix the P1B61 code on my Cadillac myself?

If you have experience with hybrid or electric vehicles and the proper tools, you may be able to address simple issues like checking connections or wiring. However, high-voltage systems can be dangerous and should typically be serviced by a professional.