P1B55 Cadillac Code - Hybrid/Electric Vehicle Battery 38 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
- P1B55 Cadillac indicates Hybrid/Electric Vehicle Battery 38 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 P1B55 Cadillac 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 P1B55 Cadillac?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P1B55 Cadillac?
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 P1B55 Cadillac 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 P1B55 Cadillac Code
1. What does the OBDII code P1B55 mean on a Cadillac?
P1B55 indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 38 Circuit, commonly found in Cadillac hybrid or electric models.
2. What are the symptoms of a P1B55 code?
Symptoms may include reduced hybrid or electric performance, warning lights on the dashboard, and potential issues with battery charging or power delivery.
3. What causes the P1B55 code to appear?
Common causes include a faulty battery cell, damaged wiring or connectors in the Battery 38 Circuit, or issues with the battery management system.
4. Can I drive my Cadillac with a P1B55 code?
Driving with this code may be possible but is not recommended, as it can lead to further damage to the hybrid/electric system or result in limited performance.
5. How is the P1B55 code diagnosed?
A technician will use a scan tool to read the code, inspect the Battery 38 Circuit for wiring or connector issues, and test the voltage levels of the battery system.
6. How do you fix the P1B55 code on a Cadillac?
Repairs may involve replacing damaged wiring, repairing connectors, replacing a faulty battery cell, or recalibrating the battery management system.
7. How much does it cost to fix the P1B55 code?
Repair costs vary but can range from $200 for wiring repairs to over $1,000 if battery cell replacement is needed, depending on labor and parts.
8. Can a low auxiliary battery cause the P1B55 code?
While unlikely, issues in the auxiliary battery system could potentially affect hybrid system performance and trigger related codes.
9. Will clearing the P1B55 code resolve the problem?
Clearing the code without addressing the root cause may result in the code reappearing and could risk further damage to the hybrid system.
10. Can a software update fix the P1B55 code?
In some cases, a software update to the battery management system might resolve the issue, but this depends on the specific diagnostic findings.
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