P1E77 Buick 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 Buick 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.
Code P1E77 Buick Description
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.
What are the Possible Causes of the DTC P1E77 Buick?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P1E77 Buick?
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 Buick 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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Frequently Asked Questions about P1E77 Buick Code
1. What does the OBDII code P1E77 mean on a Buick?
P1E77 indicates an issue with the Hybrid/Electric Vehicle Battery 76 circuit, often related to voltage inconsistencies or a fault in the battery monitoring system.
2. What are the common symptoms of P1E77 on a Buick?
Symptoms include reduced hybrid or electric performance, warning lights on the dashboard, and limited battery charging or discharging functionality.
3. What causes the P1E77 code to appear on a Buick?
Common causes include a faulty battery cell, poor electrical connections, damaged wiring, or a malfunctioning battery energy control module.
4. Can I drive my Buick with the P1E77 code active?
While the vehicle may still operate, driving with this code can lead to reduced performance and potential damage to the battery system. Prompt diagnosis and repair are recommended.
5. How is the P1E77 code diagnosed on a Buick?
A technician will use a scan tool to read the code, inspect the battery circuit for damage or loose connections, and test the battery energy control module for faults.
6. What repairs are typically required for the P1E77 code?
Repairs may include replacing damaged wiring, repairing or replacing the affected battery cell, or replacing the battery energy control module if necessary.
7. How much does it cost to fix the P1E77 code on a Buick?
Repair costs vary depending on the issue, but replacing a battery cell or module can range from $500 to $2,500 or more, depending on parts and labor.
8. Can a dead 12V battery cause the P1E77 code in a Buick?
No, this code is specific to the high-voltage hybrid/electric battery system and is unrelated to the 12V battery.
9. Does clearing the P1E77 code fix the problem?
Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return.
10. Can routine maintenance help prevent the P1E77 code on a Buick?
Yes, regular inspections of the battery system, wiring, and connections can help identify potential issues before they trigger the code.
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