AutoCodes – GMC – B1344 GMC

B1344 GMC Code - Mode Actuator

Quick Answer

The Instrument Panel Module (IPM) controls the HVAC door actuators to regulate the airflow through the Heating, Ventilation, and Air Conditioning (HVAC) system. Common causes include Faulty Mode Actuator, Mode Actuator harness is open or shorted, Mode Actuator 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: B1344 GMC indicates Mode Actuator.
Common causes: Common causes include Faulty Mode Actuator, Mode Actuator harness is open or shorted, Mode Actuator 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 699

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 Mar 14, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1344 GMC Description

The Instrument Panel Module (IPM) controls the HVAC door actuators to regulate the airflow through the Heating, Ventilation, and Air Conditioning (HVAC) system. Each actuator is a 5-wire bi-directional electric motor that incorporates a feedback potentiometer. Ignition 3 voltage, low reference, control, 5-volt reference and position signal circuits enable the actuator to operate. The control circuit uses either a 0, 2.5, or 5-volt signal to command the actuator movement. When the actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5-volt control signal commands the actuator movement in opposite directions. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts. The IPM converts the voltage values to count values where one volt is approximately equal to 51 counts. The IPM uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted value, the control signal is changed to either 0 or 5 volts depending upon the direction that the actuator needs to rotate to reach the commanded value. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module changes the control signal to 2.5 volts.

OBDII Code B1344 GMC - Mode Actuator - AutoCodes.com — B1344 GMC Code - Mode Actuator

What does this mean?

What are the Possible Causes of the DTC B1344 GMC?

Faulty Mode Actuator
Mode Actuator harness is open or shorted
Mode Actuator circuit poor electrical connection
Faulty Instrument Panel Module (IPM)

How to Fix the DTC B1344 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 B1344 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 B1344 GMC Code

1. What is OBDII code B1344 GMC related to Mode Actuator?

The B1344 code pertains to a fault in the Mode Actuator in a GMC vehicle's HVAC system.

2. What are the common symptoms of OBDII code B1344 GMC?

Common symptoms include inconsistent airflow from the HVAC vents, the inability to switch between different airflow modes, and unusual noises coming from the HVAC system.

3. What are the possible causes of OBDII code B1344 GMC?

The code can be triggered by a malfunctioning Mode Actuator, damaged wiring or connectors, a faulty control module, or issues with the HVAC blend door.

4. How can I diagnose the issue related to OBDII code B1344 GMC?

Diagnosis typically involves using a scan tool to read the specific trouble code, inspecting the Mode Actuator and related components for visible damage, and testing the electrical connections for proper voltage and continuity.

5. Can I drive my GMC vehicle with OBDII code B1344?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to avoid any discomfort or further damage to the HVAC system.

6. How can I repair OBDII code B1344 GMC?

Repair options may include replacing the Mode Actuator, repairing or replacing damaged wiring, resetting the control module, or recalibrating the HVAC system.

7. Is it possible to reset OBDII code B1344 GMC without repairs?

Resetting the code without addressing the underlying issue may temporarily clear the warning light, but the problem is likely to reoccur. It is best to diagnose and repair the root cause of the code.

8. Can a DIY enthusiast fix OBDII code B1344 GMC?

Depending on the individual's skill level and access to tools, DIY enthusiasts may be able to address this code by following repair guides and videos. However, complex HVAC system repairs may require professional assistance.

9. How much does it cost to repair OBDII code B1344 GMC?

The cost of repair can vary depending on the specific issue causing the code, the labor rates in your area, and the parts needed. It is advisable to obtain quotes from local mechanics or dealerships for an accurate estimate.

10. How long does it take to repair OBDII code B1344 GMC?

The repair time can vary based on the complexity of the issue and the expertise of the person performing the repair. Simple fixes like replacing a Mode Actuator may take a few hours, while more intricate problems could require a day or more.