AutoCodes – Cadillac – P1B59 Cadillac

P1B59 Cadillac Code - Hybrid/Electric Vehicle Battery 39 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: P1B59 Cadillac indicates Hybrid/Electric Vehicle Battery 39 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 799

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 P1B59 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 P1B59 Cadillac - Hybrid/Electric Vehicle Battery 39 Circuit High Voltage - AutoCodes.com — P1B59 Cadillac Code - Hybrid/Electric Vehicle Battery 39 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B59 Cadillac?

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

How to Fix the DTC P1B59 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 P1B59 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 P1B59 Cadillac Code

1. What does the OBDII code P1B59 mean on a Cadillac?

P1B59 indicates a problem with the high voltage circuit in the Hybrid/Electric Vehicle Battery 39, typically related to abnormal voltage levels.

2. What are common symptoms of the P1B59 code on a Cadillac?

Symptoms may include a check engine light, reduced hybrid system performance, decreased fuel efficiency, or the vehicle entering limp mode.

3. What causes the P1B59 code to appear on a Cadillac?

Common causes include a faulty battery module, damaged wiring or connectors in the high-voltage circuit, or a malfunction in the hybrid control module.

4. Can driving with the P1B59 code damage my vehicle?

Yes, continuing to drive with this code could potentially damage the hybrid battery system or other related components.

5. How do you diagnose the P1B59 code on a Cadillac?

A technician will use a scan tool to check for related codes, inspect the high-voltage wiring and connectors, and test the battery module for proper voltage levels.

6. What repairs are typically needed for the P1B59 code?

Repairs may include replacing the faulty battery module, repairing or replacing damaged wiring, or reprogramming the hybrid control module.

7. How much does it cost to fix the P1B59 code on a Cadillac?

Repair costs vary depending on the issue but can range from $200 for wiring repairs to over $1,000 for battery module replacement.

8. Can a dead 12V battery cause the P1B59 code?

While unlikely, a failing 12V battery could indirectly affect the hybrid system and should be tested as part of the diagnosis.

9. Do I need a dealer to fix the P1B59 code on my Cadillac?

While a dealer is often recommended due to their expertise with hybrid systems, a qualified independent mechanic with hybrid experience can also perform the repairs.

10. How can I prevent the P1B59 code from returning?

Regular maintenance of the hybrid system, including inspecting wiring and connectors, and addressing any warning signs early, can help prevent recurrence.