AutoCodes – Saturn – P1B77 Saturn

P1B77 Saturn Code - Hybrid/Electric Vehicle Battery 49 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: P1B77 Saturn indicates Hybrid/Electric Vehicle Battery 49 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 1,162

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 P1B77 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 P1B77 Saturn - Hybrid/Electric Vehicle Battery 49 Circuit High Voltage - AutoCodes.com — P1B77 Saturn Code - Hybrid/Electric Vehicle Battery 49 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B77 Saturn?

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

How to Fix the DTC P1B77 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 P1B77 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 P1B77 Saturn Code

1. What are the common symptoms of OBDII code P1B77 on a Saturn Hybrid/Electric Vehicle?

- Common symptoms include the illumination of the check engine light, reduced vehicle performance, or complete failure to start.

2. What are the possible causes of OBDII code P1B77 on a Saturn Hybrid/Electric Vehicle?

- The code P1B77 usually indicates a high voltage issue within the hybrid/electric vehicle battery 49 circuit, which could be caused by a faulty battery pack, damaged wiring, or a malfunctioning control module.

3. How can I diagnose OBDII code P1B77 on my Saturn Hybrid/Electric Vehicle?

- Diagnosing code P1B77 often requires specialized diagnostic equipment to check the voltage levels in the battery 49 circuit, inspect the wiring for damage, and test the control module for proper functioning.

4. Can I still drive my Saturn Hybrid/Electric Vehicle with OBDII code P1B77 present?

- It is not recommended to drive the vehicle with code P1B77 present, as it could lead to further damage to the hybrid/electric system and potentially compromise safety.

5. How can I repair OBDII code P1B77 on my Saturn Hybrid/Electric Vehicle?

- Repairing code P1B77 typically involves addressing the underlying high voltage issue in the battery 49 circuit, which may require replacing the battery pack, repairing damaged wiring, or reprogramming the control module.

6. Is it safe to attempt DIY repairs for OBDII code P1B77 on a Saturn Hybrid/Electric Vehicle?

- Due to the high voltage nature of hybrid/electric vehicle systems, it is recommended to seek professional help or consult a certified technician for repairs related to code P1B77 to ensure safety and proper diagnosis.

7. What should I do if I encounter OBDII code P1B77 intermittently on my Saturn Hybrid/Electric Vehicle?

- If code P1B77 appears intermittently, it is still important to address the issue promptly to prevent potential damage to the hybrid/electric system. Have the vehicle inspected by a professional to determine the root cause.

8. Are there any preventive measures to avoid OBDII code P1B77 on a Saturn Hybrid/Electric Vehicle?

- Regular maintenance of the hybrid/electric system, including checking the battery pack and wiring for any signs of wear or damage, can help prevent issues like code P1B77 from occurring.

9. Can OBDII code P1B77 on a Saturn Hybrid/Electric Vehicle be reset without repairs?

- While you can clear the code temporarily, it is important to address the underlying issue causing code P1B77 to prevent it from recurring and potentially causing further damage to the vehicle.

10. Does OBDII code P1B77 on a Saturn Hybrid/Electric Vehicle affect fuel efficiency?

- OBDII code P1B77 typically does not affect fuel efficiency directly, but it can impact the overall performance and drivability of the vehicle, leading to decreased efficiency if left unresolved.