P1B85 Chevrolet Code - Hybrid/Electric Vehicle Battery 54 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
- P1B85 Chevrolet indicates Hybrid/Electric Vehicle Battery 54 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 P1B85 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 P1B85 Chevrolet?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P1B85 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 P1B85 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.
Need more information about the P1B85 Chevrolet code?
Need more information on how to fix the P1B85 Chevrolet code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1B85 Chevrolet code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1B85 Chevrolet Code
1. What does the OBDII code P1B85 mean on a Chevrolet?
The P1B85 code indicates a "Hybrid/Electric Vehicle Battery 54 Circuit Low Voltage," meaning one of the battery circuits is reporting a voltage lower than expected.
2. What are the common symptoms of the P1B85 code in a Chevrolet?
Symptoms may include a check engine light, reduced hybrid or EV performance, poor fuel efficiency, or the vehicle entering limp mode.
3. What causes the P1B85 code to appear on a Chevrolet?
Common causes include a faulty battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery control module, or corrosion in the circuit.
4. Can I drive my Chevrolet with the P1B85 code active?
It is not recommended to drive with this code active, as it may lead to further damage, reduced performance, or the vehicle shutting down unexpectedly.
5. How is the P1B85 code diagnosed on a Chevrolet?
A technician will use a scan tool to read the code, inspect battery voltage levels, check wiring and connectors, and test the hybrid battery control module for faults.
6. Can the P1B85 code be triggered by a software issue?
Yes, outdated or corrupted software in the battery control module can sometimes cause the P1B85 code to appear and may require a reprogramming or update.
7. How do you fix the P1B85 code on a Chevrolet?
Repairs may involve replacing a faulty battery cell, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the hybrid battery control module.
8. How much does it cost to repair the P1B85 code on a Chevrolet?
Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 if the hybrid battery or control module needs replacement.
9. Does the P1B85 code always mean the hybrid battery needs replacement?
No, the issue could be with wiring, connectors, or the control module rather than the battery itself, so a proper diagnosis is essential.
10. Can routine maintenance prevent the P1B85 code on a Chevrolet?
Regular inspection of the hybrid system’s wiring, connectors, and battery health can help prevent issues leading to the P1B85 code.
Discuss the causes and fixes for P1B85 Chevrolet OBDII Code
Code P1B85 Chevrolet comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
