P1BAC Buick Code - Hybrid/Electric Vehicle Battery 67 Circuit Low 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
- P1BAC Buick indicates Hybrid/Electric Vehicle Battery 67 Circuit Low 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 P1BAC 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 P1BAC Buick?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P1BAC 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 P1BAC 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 P1BAC Buick Code
1. What does the OBDII code P1BAC mean on a Buick?
P1BAC indicates a "Hybrid/Electric Vehicle Battery 67 Circuit Low Voltage," meaning the vehicle's control module has detected low voltage in the specific circuit related to the hybrid or electric battery system.
2. What are the common symptoms of the P1BAC code?
Symptoms may include a Check Engine Light or Service Hybrid System warning, reduced fuel efficiency, limited hybrid functionality, or the vehicle operating in reduced performance mode.
3. What causes the P1BAC code to appear?
Possible causes include a faulty hybrid battery, damaged wiring or connectors in the battery circuit, a malfunctioning battery control module, or internal battery pack issues.
4. Can I drive with a P1BAC code on my Buick?
It is not recommended to drive with this code active due to potential risks of reduced performance or further damage to the hybrid system. Have the vehicle inspected as soon as possible.
5. How is the P1BAC code diagnosed?
A technician will check for additional trouble codes, inspect the wiring and connectors in the battery circuit, test the hybrid battery voltage, and evaluate the battery control module's functionality.
6. What repairs might fix the P1BAC code?
Repairs may include replacing damaged wiring, repairing or replacing the hybrid battery, replacing the battery control module, or cleaning and securing electrical connections in the battery circuit.
7. How much does it cost to fix a P1BAC code on a Buick?
Costs vary depending on the issue. Wiring repairs may cost a few hundred dollars, while a hybrid battery replacement could range from $2,000 to $6,000 or more.
8. Can a dead 12-volt battery cause the P1BAC code?
A weak or failing 12-volt battery may indirectly cause hybrid system faults, but the P1BAC code specifically relates to the high-voltage hybrid battery circuit.
9. Will clearing the code fix the P1BAC issue?
Clearing the code may turn off the warning temporarily, but the underlying issue must be addressed to prevent the code from returning.
10. How can I prevent the P1BAC code from occurring again?
Regular maintenance, inspecting hybrid system components, and addressing any warning signs early can help prevent issues leading to the P1BAC code.
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