P0B66 Chevrolet Code - Hybrid/Electric Vehicle Battery 9 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
- P0B66 Chevrolet indicates Hybrid/Electric Vehicle Battery 9 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.
Code P0B66 Chevrolet 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 P0B66 Chevrolet?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P0B66 Chevrolet?
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 P0B66 Chevrolet 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 P0B66 Chevrolet Code
1. What does the OBDII code P0B66 mean on a Chevrolet?
P0B66 indicates a "Hybrid/Electric Vehicle Battery 9 Circuit High Voltage," meaning the voltage on battery circuit 9 is higher than expected.
2. What are the common symptoms of code P0B66 in a Chevrolet?
Symptoms include warning lights on the dashboard, reduced hybrid/electric vehicle performance, and potential battery cooling system issues.
3. What causes the P0B66 code to appear in a Chevrolet?
Common causes include a faulty battery module, damaged wiring or connectors, a malfunctioning battery management system, or issues with the battery's voltage sensors.
4. Can I drive my Chevrolet with the P0B66 code?
It’s not recommended to drive with this code, as it may lead to further damage to the hybrid/electric battery system and reduced vehicle performance.
5. How is the P0B66 code diagnosed in a Chevrolet?
A technician will use a diagnostic scanner to retrieve the code, inspect the battery wiring and connections, and check the voltage levels of the affected circuit.
6. How do you fix the P0B66 code on a Chevrolet?
Repairs may involve replacing the faulty battery module, repairing damaged wiring or connectors, or reprogramming/updating the battery management system.
7. Is the P0B66 code covered under warranty for a Chevrolet hybrid/electric vehicle?
This depends on your vehicle's warranty coverage for the hybrid battery system. Check with your Chevrolet dealer for details.
8. Can a low battery trigger the P0B66 code in a Chevrolet?
No, this code specifically relates to high voltage on circuit 9 of the hybrid/electric battery system, not a low battery issue.
9. What tools are needed to diagnose the P0B66 code in a Chevrolet?
A professional-grade OBDII scanner capable of reading hybrid system codes and a multimeter for voltage testing are typically required.
10. How much does it cost to repair the P0B66 code on a Chevrolet?
Repair costs vary depending on the issue but can range from $200 for wiring repairs to over $1,000 for a battery module replacement.
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