AutoCodes – GMC – B1343 GMC

B1343 GMC Code - Recirculation 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 Recirculation Actuator, Recirculation Actuator harness is open or shorted, Recirculation 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: B1343 GMC indicates Recirculation Actuator.
Common causes: Common causes include Faulty Recirculation Actuator, Recirculation Actuator harness is open or shorted, Recirculation 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 740

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1343 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 B1343 GMC - Recirculation Actuator - AutoCodes.com — B1343 GMC Code - Recirculation Actuator

What does this mean?

What are the Possible Causes of the DTC B1343 GMC?

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

How to Fix the DTC B1343 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 B1343 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 B1343 GMC code?

Need more information on how to fix the B1343 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1343 GMC code diagnosed by a professional: Find a repair shop in your area

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 B1343 GMC Code

1. What are the common symptoms of OBDII code B1343 GMC related to the Recirculation Actuator?

- Common symptoms include the inability to control the recirculation of air inside the vehicle, unusual noises coming from the HVAC system, and inconsistent air temperature.

2. What are the possible causes of OBDII code B1343 GMC for the Recirculation Actuator?

- The code B1343 typically indicates a malfunction in the recirculation actuator itself, wiring issues, or a faulty control module.

3. How can I diagnose the Recirculation Actuator issue related to OBDII code B1343 GMC?

- To diagnose the issue, you can use an OBDII scanner to read the trouble code, visually inspect the actuator and its wiring for any damage, and perform tests to check the actuator's functionality.

4. What are some repair tips for fixing OBDII code B1343 GMC associated with the Recirculation Actuator?

- Repair tips include replacing the faulty recirculation actuator, repairing or replacing damaged wiring, and resetting the HVAC system after the repair is completed.

5. Can OBDII code B1343 GMC for the Recirculation Actuator be fixed without professional help?

- While some DIY enthusiasts may attempt to fix the issue themselves, it is recommended to seek professional help, especially if you are not familiar with HVAC systems and electronic components.

6. Is it safe to continue driving with OBDII code B1343 GMC triggered by the Recirculation Actuator issue?

- It is generally safe to continue driving with this code, but it can affect the comfort level inside the vehicle, especially in extreme weather conditions. It is advisable to get it fixed as soon as possible.

7. How much does it typically cost to repair OBDII code B1343 GMC related to the Recirculation Actuator?

- The cost of repair can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to go to a dealership or an independent mechanic. It can range from $100 to $500 or more.

8. Can a faulty Recirculation Actuator cause other OBDII codes to appear in addition to B1343 GMC?

- Yes, a malfunctioning Recirculation Actuator can sometimes trigger related codes such as B1342, B1344, or codes related to HVAC system faults.

9. How long does it typically take to repair the Recirculation Actuator issue triggering OBDII code B1343 GMC?

- The repair time can vary depending on the complexity of the issue and the availability of parts. It can take anywhere from 1 to 3 hours to complete the repair.

10. Are there any preventive measures to avoid triggering OBDII code B1343 GMC for the Recirculation Actuator in the future?

- To prevent future issues, it is recommended to perform regular maintenance on the HVAC system, address any strange noises or temperature inconsistencies promptly, and have the system inspected during routine vehicle check-ups.