AutoCodes – Saturn – P1B88 Saturn

P1B88 Saturn 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 Saturn 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 805

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

What does this mean?

What are the Possible Causes of the DTC P1B88 Saturn?

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

How to Fix the DTC P1B88 Saturn?

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 Saturn 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 Saturn Code

What does the OBDII code P1B88 mean for a Saturn vehicle?

1. P1B88 indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 55 circuit, which is part of the battery management system for hybrid or electric models. 2.

What are common symptoms of the P1B88 code in a Saturn?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, limited vehicle performance, or warnings related to the hybrid/electric battery system. 3.

What causes the P1B88 code to appear?

The code is typically caused by wiring issues, such as damaged or corroded connectors, a faulty battery module, or a malfunction in the battery management system. 4.

Can I continue driving with a P1B88 code on my Saturn?

It is not recommended to drive for extended periods with this code, as it may affect vehicle performance and potentially lead to further damage in the hybrid/electric system. 5.

How do you diagnose the P1B88 code in a Saturn?

Diagnosis involves scanning the vehicle with an OBDII scanner, inspecting the wiring and connectors related to the battery 55 circuit, and testing the battery modules and control system for faults. 6.

What repairs are needed to fix the P1B88 code?

Repairs may include replacing damaged wiring or connectors, repairing or replacing the affected battery module, or reprogramming the battery management system. 7.

How much does it cost to fix the P1B88 code on a Saturn?

The cost varies depending on the diagnosis, but repairs typically range from $200 to $1,000, depending on whether wiring, battery modules, or control units need replacement. 8.

Can a low auxiliary battery trigger the P1B88 code?

No, the P1B88 code specifically relates to the high-voltage hybrid/electric battery system, not the 12-volt auxiliary battery. 9.

Is the P1B88 code a common issue in Saturn hybrid vehicles?

While not extremely common, this code can occur in older hybrid/electric Saturn models due to wear and tear or poor maintenance of the battery system. 10.

What preventive measures can help avoid the P1B88 code?

Regularly inspect and maintain the hybrid battery system, ensure all wiring and connectors are in good condition, and address any warning lights or performance issues promptly.