AutoCodes – GMC – P303A GMC

P303A GMC Code - Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance

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: P303A GMC indicates Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance.
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 974

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 P303A GMC 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 P303A GMC - Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance - AutoCodes.com — P303A GMC Code - Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P303A GMC?

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 P303A GMC?

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 P303A GMC 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 P303A GMC Code

1. What are common symptoms of OBDII code P303A GMC related to the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- Common symptoms include poor fuel economy, reduced engine performance, and the illumination of the Check Engine Light.

2. What are possible causes of OBDII code P303A GMC indicating an issue with the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- Potential causes include faulty hybrid/EV battery interface control module, wiring issues, sensor malfunction, or software glitches.

3. How can I diagnose OBDII code P303A GMC related to the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- Diagnosis involves using an OBDII scanner to retrieve the code, inspecting wiring and connectors for damage, testing the voltage sensor, and checking for any software updates.

4. Can a DIY enthusiast repair OBDII code P303A GMC associated with the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- While basic tasks like checking wiring connections can be done by a DIYer, diagnosing and repairing complex issues may require specialized tools and expertise.

5. What are the potential risks of ignoring OBDII code P303A GMC concerning the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- Ignoring this code can lead to further damage to the hybrid/EV system, reduced fuel efficiency, and potential safety hazards.

6. How much does it typically cost to repair OBDII code P303A GMC related to the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- Repair costs can vary depending on the exact cause of the issue, but they can range from a few hundred to over a thousand dollars, including parts and labor.

7. Can resetting the Check Engine Light resolve OBDII code P303A GMC associated with the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- Resetting the light may temporarily turn it off, but the underlying issue causing the code will likely persist and trigger the light to come back on.

8. How long can I safely drive with OBDII code P303A GMC indicating a problem with the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- It is recommended to address the issue promptly to prevent further damage. Extended driving with this code present can lead to more severe problems.

9. Are there any recalls or technical service bulletins related to OBDII code P303A GMC concerning the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- It's advisable to check with a GMC dealership or online resources for any relevant recalls or technical service bulletins specific to this code and related issues.

10. How can regular maintenance help prevent OBDII code P303A GMC from occurring in the future regarding the Hybrid/EV Battery Interface Control Module 11 Voltage Sensor Circuit Performance?

- Regular maintenance, including inspections of the hybrid/EV system components, can help identify and address potential issues before they trigger a fault code like P303A.