AutoCodes – GMC – B3009 GMC

B3009 GMC Code - Hood Ajar Circuit High

Quick Answer

The Hybrid Control Module (HCM) uses the hood switch signal to monitor the open or closed position of the hood for hybrid system function. Common causes include Faulty Hood Switch, Hood Switch harness is open or shorted, Hood Switch 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: B3009 GMC indicates Hood Ajar Circuit High.
Common causes: Common causes include Faulty Hood Switch, Hood Switch harness is open or shorted, Hood Switch 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 455

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 Mar 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3009 GMC Description

The Hybrid Control Module (HCM) uses the hood switch signal to monitor the open or closed position of the hood for hybrid system function. The hood switch indicates the state of the vehicle hood, either open or closed. The hood switch output signal is an input to an HCM. Five volts is supplied to the switch, the returned voltage is measured relative to HCM signal ground to determine the switch state. A resistor network in the switch circuitry ensures that shorted high and low states can be diagnosed successfully. Hood Position Condition Met indicates that the hood position, as read by the HCM, meets the HCM requirements for entry into Idle Engine Off (IEO) hood closed. Driver Notification - Hood Ajar is used to request the Instrument Panel Cluster (IPC) to display or clear the Hood Ajar message on the DIC. This message will be displayed by the IPC until the driver acknowledges the message e.g., via the IPC Stem, Trip, Fuel, Personalization or Select buttons on the Steering Wheel or until requested off by the HCM via GMLAN message. The HCM shall not request the message to be displayed again until the next ignition cycle if the conditions for setting the message still exist unless or until the hood transitions back to closed and then back to reopened.

OBDII Code B3009 GMC - Hood Ajar Circuit High - AutoCodes.com — B3009 GMC Code - Hood Ajar Circuit High

What does this mean?

What are the Possible Causes of the DTC B3009 GMC?

Faulty Hood Switch
Hood Switch harness is open or shorted
Hood Switch circuit poor electrical connection
Faulty Hybrid Control Module (HCM)

How to Fix the DTC B3009 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 B3009 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 B3009 GMC Code

1. What are the common symptoms of OBDII code B3009 GMC (Hood Ajar Circuit High)?

- The common symptoms include the hood open warning light illuminated on the dashboard, the hood open message displayed on the instrument cluster, and potential issues with remote start functionality.

2. What are the possible causes of the Hood Ajar Circuit High code B3009 in a GMC vehicle?

- The code B3009 may be triggered by a faulty hood latch sensor, a damaged wiring harness related to the hood ajar circuit, or a malfunctioning body control module.

3. How can I diagnose the Hood Ajar Circuit High issue in my GMC vehicle?

- To diagnose the issue, you can visually inspect the hood latch sensor and wiring for any signs of damage, use a multimeter to test for continuity in the circuit, and perform a scan tool diagnostics to retrieve specific fault codes.

4. Can I drive my GMC vehicle with the Hood Ajar Circuit High code B3009 present?

- It is generally safe to drive the vehicle with the B3009 code, but it is recommended to address the issue promptly to prevent potential issues with the hood latch system and the vehicle's electrical system.

5. How can I repair the Hood Ajar Circuit High code B3009 in my GMC vehicle?

- Repair options may include replacing the hood latch sensor, repairing or replacing damaged wiring in the circuit, and reprogramming or replacing the body control module if necessary.

6. Is it possible to reset the B3009 code without fixing the underlying issue?

- Resetting the B3009 code without addressing the root cause, such as fixing a faulty hood latch sensor or repairing damaged wiring, may result in the code reappearing once the system detects the issue again.

7. Can extreme weather conditions impact the Hood Ajar Circuit High code in a GMC vehicle?

- Extreme weather conditions, such as excessive heat or cold, can sometimes affect the hood latch sensor or wiring, potentially leading to the triggering of the B3009 code.

8. Are there any preventative measures to avoid the recurrence of the Hood Ajar Circuit High issue?

- Regularly inspecting the hood latch system, keeping it clean and lubricated, and addressing any issues promptly can help prevent the recurrence of the B3009 code in a GMC vehicle.

9. Will fixing the Hood Ajar Circuit High code affect the vehicle's warranty?

- If your GMC vehicle is still under warranty, it is recommended to have the issue addressed by an authorized dealership to ensure that any repairs are covered under the warranty terms.

10. How long does it typically take to repair the Hood Ajar Circuit High issue in a GMC vehicle?

- The repair time can vary depending on the specific cause of the B3009 code, but it generally takes a few hours to a day to diagnose and fix the issue, depending on the complexity of the repair needed.