AutoCodes – GMC – P15B9 GMC

P15B9 GMC 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 GMC 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 1,237

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 Jan 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P15B9 GMC 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 GMC - Electric A/C Compressor Control Module Ignition On/Start Switch Circuit Low Voltage - AutoCodes.com — P15B9 GMC 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 GMC?

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 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 P15B9 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.

Need more information about the P15B9 GMC code?

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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 GMC Code

1. What are the common symptoms of OBDII code P15B9 GMC?

- Common symptoms include the A/C not working, poor cooling performance, or the A/C compressor not engaging.

2. What can cause the Electric A/C Compressor Control Module Ignition On/Start Switch Circuit low voltage error code?

- Causes may include a faulty electric A/C compressor control module, a problem with the ignition on/start switch circuit, or wiring issues.

3. How do I diagnose the P15B9 code related to the Electric A/C Compressor Control Module?

- Diagnosis typically involves using a scan tool to read the code, checking the wiring and connectors, and testing the components involved in the circuit.

4. Can a low vehicle battery voltage trigger the P15B9 code on a GMC vehicle?

- Yes, low battery voltage can sometimes cause electrical issues that trigger the P15B9 code. It is recommended to ensure the battery is in good condition.

5. What are some repair tips for addressing the Electric A/C Compressor Control Module Ignition On/Start Switch Circuit low voltage issue?

- Repair tips may include checking and repairing any damaged wiring, replacing a faulty control module, or addressing an issue with the ignition switch.

6. Is it safe to continue driving with the P15B9 GMC trouble code present?

- It is not recommended to drive with unresolved electrical issues related to the A/C system, as it may lead to further damage or discomfort while driving.

7. Can a DIY enthusiast fix the P15B9 code at home, or is professional help required?

- Depending on the individual's skills and knowledge, some DIY enthusiasts may be able to address the P15B9 code by following diagnostic procedures and repair steps carefully.

8. How crucial is it to address the P15B9 error code promptly?

- It is important to address the P15B9 code promptly to ensure the proper functioning of the A/C system and avoid potential complications down the road.

9. Are there any preventive measures to avoid encountering the P15B9 GMC trouble code in the future?

- Regular maintenance checks, including inspecting the A/C system components and electrical connections, can help prevent issues that may trigger the P15B9 code.

10. Can weather conditions or environmental factors contribute to triggering the P15B9 error code?

- Extreme temperatures or humidity levels can sometimes affect the A/C system's performance, potentially leading to issues that trigger the P15B9 code.