P1B56 Chevrolet Code - Hybrid/Electric Vehicle Battery 38 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
- P1B56 Chevrolet indicates Hybrid/Electric Vehicle Battery 38 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 P1B56 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 P1B56 Chevrolet?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P1B56 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 P1B56 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 P1B56 Chevrolet Code
1. What does the OBDII code P1B56 mean on a Chevrolet?
The P1B56 code indicates a fault in the Hybrid/Electric Vehicle Battery 38 Circuit, specifically related to high voltage being detected.
2. What are the common symptoms of the P1B56 code in Chevrolet vehicles?
Symptoms may include an illuminated check engine light, reduced hybrid/electric vehicle performance, decreased fuel efficiency, or the vehicle entering limp mode.
3. What causes the P1B56 code in a Chevrolet hybrid or electric vehicle?
Common causes include damaged wiring or connectors in the high-voltage circuit, a malfunctioning battery module, or issues with the battery energy control module.
4. Can I continue driving my Chevrolet with the P1B56 code?
Driving is not recommended as the high-voltage fault may lead to reduced performance, safety risks, or further damage to the vehicle's electrical system.
5. How do you diagnose the P1B56 code in a Chevrolet vehicle?
A technician will use a scan tool to confirm the code, inspect the high-voltage battery circuit for damage, and test the battery module and related components.
6. What repairs are needed to fix the P1B56 code on a Chevrolet?
Repairs may involve replacing damaged wiring, repairing or replacing the battery module, or reprogramming the battery energy control module.
7. How much does it cost to fix a P1B56 code in a Chevrolet hybrid or electric vehicle?
Repair costs vary, but fixing high-voltage circuit issues can range from $200 to $2,000 depending on the parts and labor required.
8. Can a weak or failing high-voltage battery cause the P1B56 code?
Yes, a failing or malfunctioning high-voltage battery can trigger the P1B56 code by causing irregular voltage readings in the circuit.
9. Do I need special tools to diagnose or repair the P1B56 code?
Yes, diagnosing and repairing this code often requires specialized equipment, such as a scan tool capable of reading hybrid/electric vehicle systems and proper safety equipment for handling high voltage.
10. Is the P1B56 code covered under Chevrolet’s hybrid or electric vehicle warranty?
It may be covered if the vehicle is still under the hybrid or electric powertrain warranty. Check with your dealership for warranty details.
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