AutoCodes – Cadillac – P1B88 Cadillac

P1B88 Cadillac Code - Hybrid/Electric Vehicle Battery 55 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: P1B88 Cadillac indicates Hybrid/Electric Vehicle Battery 55 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 795

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 P1B88 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 P1B88 Cadillac - Hybrid/Electric Vehicle Battery 55 Circuit Low Voltage - AutoCodes.com — P1B88 Cadillac Code - Hybrid/Electric Vehicle Battery 55 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B88 Cadillac?

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

How to Fix the DTC P1B88 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 P1B88 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 P1B88 Cadillac Code

1. What are the common symptoms of OBDII code P1B88 in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced power or performance, decreased fuel efficiency, and potentially difficulty starting the vehicle.

2. What can cause the OBDII code P1B88 Cadillac Hybrid/Electric Vehicle Battery 55 Circuit Low Voltage?

- This code is typically triggered by issues such as a faulty battery, damaged wiring, loose connections, or problems with the battery management system.

3. How can I diagnose the OBDII code P1B88 in my Cadillac Hybrid/Electric Vehicle?

- To diagnose this code, you can use an OBDII scanner to retrieve the specific fault codes, check the battery voltage levels, inspect the battery connections, and perform a visual inspection of the wiring.

4. What are the potential risks of driving with the OBDII code P1B88 present in a Cadillac Hybrid/Electric Vehicle?

- Driving with this code can lead to further damage to the battery system, reduced vehicle efficiency, and potentially unsafe driving conditions due to power loss issues.

5. Can I repair the OBDII code P1B88 Cadillac Hybrid/Electric Vehicle Battery 55 Circuit Low Voltage myself?

- While basic checks like inspecting connections and wiring can be done by DIY enthusiasts, diagnosing and repairing complex electrical issues related to this code may require professional assistance.

6. What are some tips for preventing the recurrence of the OBDII code P1B88 in my Cadillac Hybrid/Electric Vehicle?

- Regularly maintaining your vehicle's battery, ensuring proper battery connections, and promptly addressing any warning signs can help prevent the recurrence of this code.

7. Is it safe to drive my Cadillac Hybrid/Electric Vehicle with the OBDII code P1B88 temporarily cleared?

- It is not recommended to drive the vehicle with the code cleared unless you have identified and fixed the underlying issue, as it may lead to further problems or potential safety hazards.

8. Does the OBDII code P1B88 affect the hybrid/electric functionality of my Cadillac vehicle?

- Yes, this code specifically relates to the battery circuit's voltage, which can impact the performance and efficiency of the hybrid/electric system in the vehicle.

9. How much does it cost to repair the OBDII code P1B88 Cadillac Hybrid/Electric Vehicle Battery 55 Circuit Low Voltage at a dealership or repair shop?

- The cost of repair can vary depending on the extent of the issue, but it may involve battery replacements, wiring repairs, or system recalibration, which could range from a few hundred to over a thousand dollars.

10. Can the OBDII code P1B88 in a Cadillac Hybrid/Electric Vehicle be triggered by environmental factors or extreme weather conditions?

- While rare, extreme temperatures or environmental factors like moisture can potentially contribute to issues leading to the triggering of this code.