AutoCodes – Chevrolet – P15B9 Chevrolet

P15B9 Chevrolet Code - Electric A/C Compressor Control Module Ignition On/Start Switch Circuit Low Voltage

Quick Answer

The Body Control Module (BCM) controls the ignition run relay through the control circuit by applying voltage to the circuit. Common causes include Faulty Hybrid Powertrain Control Module 2, Hybrid Powertrain Control Module 2 harness is open or shorted, Hybrid Powertrain Control Module 2 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: P15B9 Chevrolet indicates Electric A/C Compressor Control Module Ignition On/Start Switch Circuit Low Voltage.
Common causes: Common causes include Faulty Hybrid Powertrain Control Module 2, Hybrid Powertrain Control Module 2 harness is open or shorted, Hybrid Powertrain Control Module 2 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 1,269

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jan 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P15B9 Chevrolet Description

The Body Control Module (BCM) controls the ignition run relay through the control circuit by applying voltage to the circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Vehicle in Service Mode. The hybrid powertrain control module 2 sends the vehicle power mode status in a serial data message to the battery charger control module, A/C compressor, battery energy control module, fuel pump control module and the Transmission Control Module (TCM).

OBDII Code P15B9 Chevrolet - Electric A/C Compressor Control Module Ignition On/Start Switch Circuit Low Voltage - AutoCodes.com — P15B9 Chevrolet Code - Electric A/C Compressor Control Module Ignition On/Start Switch Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P15B9 Chevrolet?

Faulty Hybrid Powertrain Control Module 2
Hybrid Powertrain Control Module 2 harness is open or shorted
Hybrid Powertrain Control Module 2 circuit poor electrical connection

How to Fix the DTC P15B9 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 P15B9 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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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 P15B9 Chevrolet Code

1. What does the OBDII code P15B9 mean on a Chevrolet?

P15B9 indicates a low voltage issue in the Electric A/C Compressor Control Module Ignition On/Start Switch Circuit, which can affect the operation of the air conditioning system.

2. What are the common symptoms of code P15B9 on a Chevrolet?

Common symptoms include the A/C system not functioning, reduced cooling performance, an illuminated check engine light, and potentially unusual electrical behavior.

3. What causes the P15B9 code to appear?

The most common causes include a faulty A/C compressor control module, damaged or corroded wiring, a weak vehicle battery, or a bad ignition switch.

4. Can a bad battery trigger the P15B9 code?

Yes, a weak or failing battery can cause low voltage in the circuit, triggering the P15B9 code.

5. How can I troubleshoot the P15B9 code?

Check the battery voltage, inspect wiring and connectors for damage or corrosion, and test the A/C compressor control module for proper function.

6. Can I still drive my Chevrolet with the P15B9 code?

While the vehicle may still be drivable, the A/C system likely wonâ€™t function properly, and ignoring the issue could lead to further electrical problems.

7. How is the P15B9 code fixed?

Repairs may involve replacing the A/C compressor control module, repairing damaged wiring, cleaning corroded connectors, or replacing the vehicle battery or ignition switch.

8. Is the P15B9 code related to the ignition system?

Yes, the code is linked to the ignition on/start switch circuit, which provides power to the A/C compressor control module.

9. How much does it cost to fix the P15B9 code on a Chevrolet?

Repair costs vary depending on the cause but typically range from $150 to $600, depending on whether wiring repairs, module replacement, or other parts are needed.

10. Can a DIYer fix the P15B9 code?

If you have basic electrical skills, you can inspect and repair wiring or connectors. However, replacing the A/C compressor control module or diagnosing more complex issues may require professional help.