AutoCodes – Buick – P3038 Buick

P3038 Buick Code - Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Low Voltage

Quick Answer

The hybrid battery contains 192 individual cells. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module circuit poor electrical connection. 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: P3038 Buick indicates Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module circuit poor electrical connection.
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.

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Code Popularity 963

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P3038 Buick Description

The hybrid battery contains 192 individual cells. Two cells are welded together in parallel and called a cell group. There are a total of 96 cell groups in the hybrid battery assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cell groups are joined to form 3 distinct sections. The first 24 battery cell groups make up battery section 1. This section is adjacent to the cowl and contains battery cell groups 73 through 96. The next 28 battery cell groups make up battery section 2. This section is located behind section 1 and contains battery cell groups 45 through 72. The transverse battery section is section number 3 and it contains the remaining 44 battery cell groups 1 through 44. The battery sections also contain two temperature sensors, with one sensor located at each end of the section.
The battery energy control module monitors the voltage of the 96 battery cell groups. The voltage sense lines are attached to each individual cell group, and these sense lines terminate at a connector located on the top surface of the battery section. A voltage sense harness joins this connector to the battery energy control module.
The battery energy control module contains internal interface control modules that monitor specific cell groups.
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 the hybrid powertrain control module 2 through serial data. The hybrid powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P3038 Buick - Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Low Voltage - AutoCodes.com — P3038 Buick Code - Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P3038 Buick?

Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC P3038 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 P3038 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P3038 Buick Code

1. What does the OBDII code P3038 mean in a Buick?

The P3038 code indicates that the Hybrid/EV Battery Interface Control Module 11 has detected a low voltage reading from its voltage sensor circuit.

2. What are the common symptoms of a P3038 code in a Buick?

Symptoms may include an illuminated check engine light, reduced hybrid system performance, poor fuel efficiency, or the vehicle entering "limp mode."

3. What causes the P3038 code in a Buick?

Common causes include a faulty voltage sensor, damaged wiring or connectors in the sensor circuit, a malfunctioning battery interface control module, or low voltage from the hybrid battery pack.

4. Can a weak hybrid battery cause the P3038 code?

Yes, a weak or failing hybrid battery can result in low voltage readings, triggering the P3038 code.

5. How do you diagnose a P3038 code in a Buick?

Diagnosis typically involves scanning for codes, inspecting the voltage sensor and its wiring, testing the hybrid battery voltage, and checking the interface control module for faults.

6. Can driving with a P3038 code damage my Buick?

Driving with this code may put additional stress on the hybrid system and could lead to further damage if not addressed promptly.

7. How do you fix the P3038 code in a Buick?

Repairs may include replacing a faulty voltage sensor, repairing damaged wiring, replacing the battery interface control module, or servicing the hybrid battery pack.

8. Is the P3038 code covered under warranty for a Buick?

In many cases, hybrid system components, including the battery and control modules, may be covered under extended warranties. Check with your dealership for specific coverage details.

9. How much does it cost to repair a P3038 code in a Buick?

The repair cost can vary widely depending on the root cause, ranging from $100 for minor wiring repairs to over $1,000 for module or battery replacement.

10. Can a P3038 code clear itself in a Buick?

If the issue is intermittent, the code might temporarily clear, but repairs are typically required to resolve the underlying problem and prevent recurrence.