AutoCodes – Cadillac – P1E77 Cadillac

P1E77 Cadillac Code - Hybrid/Electric Vehicle Battery 76 Circuit

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: P1E77 Cadillac indicates Hybrid/Electric Vehicle Battery 76 Circuit.
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 860

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E77 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 P1E77 Cadillac - Hybrid/Electric Vehicle Battery 76 Circuit - AutoCodes.com — P1E77 Cadillac Code - Hybrid/Electric Vehicle Battery 76 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E77 Cadillac?

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

How to Fix the DTC P1E77 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 P1E77 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 P1E77 Cadillac Code

1. What are common symptoms of OBDII code P1E77 in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include poor fuel efficiency, reduced power, and a possible illuminated check engine light.

2. What could be the potential causes of OBDII code P1E77 in a Cadillac Hybrid/Electric Vehicle?

- The code P1E77 typically indicates a fault in the Hybrid/Electric Vehicle Battery 76 Circuit, which could be caused by a battery issue, wiring problem, or a faulty sensor.

3. How can I diagnose the OBDII code P1E77 in my Cadillac Hybrid/Electric Vehicle?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, checking the battery connections, inspecting wiring for damage, and testing the battery voltage and health.

4. Is it safe to continue driving with OBDII code P1E77 present in my Cadillac Hybrid/Electric Vehicle?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the hybrid/electric system and potentially leave you stranded.

5. Can I repair OBDII code P1E77 in my Cadillac Hybrid/Electric Vehicle myself?

- While some simple checks like inspecting connections and wiring can be done DIY, diagnosing and repairing the underlying issue may require specialized tools and knowledge best handled by a professional.

6. What are the potential repair options for OBDII code P1E77 in a Cadillac Hybrid/Electric Vehicle?

- Repair options may include replacing the hybrid/electric vehicle battery, repairing damaged wiring, or recalibrating the system as recommended by a qualified technician.

7. How much does it typically cost to repair OBDII code P1E77 in a Cadillac Hybrid/Electric Vehicle?

- Repair costs can vary depending on the specific issue causing the code, but it's important to budget for potential battery replacement or wiring repairs, which can be significant.

8. Can a faulty sensor trigger OBDII code P1E77 in a Cadillac Hybrid/Electric Vehicle?

- Yes, a faulty sensor related to the Hybrid/Electric Vehicle Battery 76 Circuit can trigger the code P1E77 and should be checked during diagnosis.

9. Are there any maintenance tips to prevent OBDII code P1E77 from appearing in my Cadillac Hybrid/Electric Vehicle?

- Regularly checking the health of your hybrid/electric vehicle battery, keeping connections clean and secure, and following recommended maintenance schedules can help prevent this code from appearing.

10. How long does it take to repair OBDII code P1E77 in a Cadillac Hybrid/Electric Vehicle?

- The repair time can vary based on the specific issue, availability of parts, and the technician's workload, but it's advisable to consult with a professional for a more accurate estimate.