P1E86 Buick Code - Hybrid/Electric Vehicle Battery 91 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
- P1E86 Buick indicates Hybrid/Electric Vehicle Battery 91 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 P1E86 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 P1E86 Buick?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P1E86 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 P1E86 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 P1E86 Buick Code
1. What does the OBDII code P1E86 mean on a Buick?
P1E86 indicates an issue with the Hybrid/Electric Vehicle Battery 91 Circuit, which suggests a problem with the communication or performance of a specific battery module.
2. What are the common symptoms of code P1E86 in a Buick?
Symptoms may include a check engine light or hybrid system warning, reduced fuel efficiency, limited electric drive capability, or the vehicle entering limp mode.
3. What causes the P1E86 code to appear?
Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, or issues with the Battery Energy Control Module (BECM).
4. Can I drive my Buick with the P1E86 code active?
It is not recommended to drive for extended periods, as the vehicle may experience reduced performance or further damage to the hybrid system.
5. How is the P1E86 code diagnosed?
Technicians typically use a scan tool to retrieve the code, inspect the battery circuit for damaged components, and perform voltage and resistance tests on the affected circuit.
6. What repairs are needed to fix the P1E86 code on a Buick?
Repairs may include replacing a faulty battery module, repairing or replacing damaged wiring or connectors, or reprogramming the Battery Energy Control Module.
7. How much does it cost to fix the P1E86 code on a Buick?
Repair costs vary depending on the issue but can range from $200 to over $1,000, especially if a battery module or control module replacement is needed.
8. Can a weak 12V auxiliary battery cause the P1E86 code?
While unlikely, a weak auxiliary battery can sometimes affect hybrid system performance and should be tested as part of the diagnostic process.
9. Does the P1E86 code require a full hybrid battery replacement?
Not always. The issue may be isolated to a specific battery module or circuit component, so a full replacement is usually a last resort.
10. Can the P1E86 code be cleared without repairs?
Clearing the code without addressing the root cause is not recommended, as the issue will likely reoccur and could lead to further complications.
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