P1B73 Buick Code - Hybrid/Electric Vehicle Battery 48 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
- P1B73 Buick indicates Hybrid/Electric Vehicle Battery 48 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 P1B73 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 P1B73 Buick?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P1B73 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 P1B73 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 P1B73 Buick Code
1. What does the OBDII code P1B73 mean on a Buick?
P1B73 indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 48V circuit, which points to potential electrical or battery-related problems.
2. What are the common symptoms of the P1B73 code in a Buick?
Common symptoms include reduced hybrid or electric vehicle performance, warning lights on the dashboard, and possible difficulty starting the vehicle.
3. What causes the P1B73 code to appear?
The P1B73 code is typically triggered by issues like a weak or failing 48V battery, damaged wiring, corroded connectors, or a faulty battery control module.
4. Can I drive my Buick with the P1B73 code?
Driving with the P1B73 code is not recommended, as it can lead to further damage to the hybrid system or leave you stranded due to battery failure.
5. How is the P1B73 code diagnosed?
A technician will use a scan tool to read the code, inspect the 48V battery and its connections, and perform voltage and continuity tests on the circuit.
6. How do you fix the P1B73 code on a Buick?
Repairs may include replacing the 48V battery, repairing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the battery control module.
7. Can a low auxiliary battery cause the P1B73 code?
While the auxiliary battery is separate, its failure can sometimes lead to related voltage issues, so it should also be inspected during diagnosis.
8. How much does it cost to fix the P1B73 code on a Buick?
Repair costs can vary, ranging from $200 for wiring repairs to over $1,000 for battery replacement, depending on the specific issue.
9. Is the P1B73 code covered under warranty?
If your Buick is still under warranty, especially a hybrid or battery warranty, the repairs may be covered. Check with your dealer for details.
10. Can I clear the P1B73 code without fixing the issue?
Clearing the code without addressing the root cause will only temporarily remove the warning, and the issue is likely to return.
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