P1E7A Buick Code - Hybrid/Electric Vehicle Battery 79 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
- P1E7A Buick indicates Hybrid/Electric Vehicle Battery 79 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 P1E7A 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 P1E7A Buick?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P1E7A 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 P1E7A 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 P1E7A Buick Code
1. What does the OBDII code P1E7A mean on a Buick?
The P1E7A code indicates an issue with the Hybrid/Electric Vehicle Battery 79 Circuit, often related to a fault in the battery management system or wiring.
2. What are the common symptoms of the P1E7A code?
Symptoms may include an illuminated check engine light, reduced hybrid/electric performance, poor fuel economy, or limited electric-only driving range.
3. What causes the P1E7A code to appear on a Buick?
Common causes include damaged wiring, connector issues, a faulty battery module, or a malfunction in the battery management system.
4. Can I continue driving with the P1E7A code?
While the vehicle may still be drivable, continuing to drive with this code can lead to reduced performance and potential damage to the hybrid battery system.
5. How is the P1E7A code diagnosed?
A technician will use a scan tool to read the code, inspect the hybrid battery wiring and connectors, and check for faults in the battery management system.
6. What repairs are needed to fix the P1E7A code?
Repairs may include fixing or replacing damaged wiring, repairing loose connections, or replacing faulty battery modules or control components.
7. How much does it cost to fix the P1E7A code on a Buick?
Repair costs can vary widely, ranging from $100 for wiring repairs to over $1,000 for battery module or management system replacements.
8. Can a low 12-volt battery cause the P1E7A code?
While unlikely, a weak or failing 12-volt battery can sometimes cause communication issues in hybrid vehicles and should be checked as part of the diagnosis.
9. Do I need to replace the entire hybrid battery for a P1E7A code?
Not necessarily. The issue might only involve specific modules or circuits, so replacing the entire battery is not always required.
10. How can I prevent the P1E7A code from recurring?
Regular maintenance, including inspecting the hybrid battery system’s wiring and connections, can help prevent this code from reappearing.
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