AutoCodes – Chevrolet – B1340 Chevrolet

B1340 Chevrolet Code - Left Air Temperature 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 Left Air Temperature Actuator, Left Air Temperature Actuator harness is open or shorted, Left Air Temperature 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: B1340 Chevrolet indicates Left Air Temperature Actuator.
Common causes: Common causes include Faulty Left Air Temperature Actuator, Left Air Temperature Actuator harness is open or shorted, Left Air Temperature 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 1,032

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 B1340 Chevrolet 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 B1340 Chevrolet - Left Air Temperature Actuator - AutoCodes.com — B1340 Chevrolet Code - Left Air Temperature Actuator

What does this mean?

What are the Possible Causes of the DTC B1340 Chevrolet?

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

How to Fix the DTC B1340 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 B1340 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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Need Help with the 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 B1340 Chevrolet Code

1. What are the common symptoms of OBDII code B1340 in a Chevrolet related to the Left Air Temperature Actuator?

- Common symptoms include inconsistent or incorrect temperature readings from the left side air vents, the air conditioning system not cooling properly on the left side, or the heater not providing adequate warmth on the left side.

2. What can cause the OBDII code B1340 in a Chevrolet related to the Left Air Temperature Actuator?

- The code B1340 is typically triggered by a malfunction in the left air temperature actuator itself, which may be caused by a faulty actuator motor, wiring issues, or a problem with the HVAC control module.

3. How can I diagnose the OBDII code B1340 in my Chevrolet for the Left Air Temperature Actuator issue?

- Diagnosis involves using a scan tool to retrieve the specific trouble code B1340, testing the left air temperature actuator for proper operation, checking the wiring harness for any damage, and verifying the HVAC control module functionality.

4. Is it safe to continue driving my Chevrolet with the OBDII code B1340 related to the Left Air Temperature Actuator?

- While it may be safe to drive your vehicle with this code, it is recommended to address the issue promptly to avoid discomfort due to inconsistent heating or cooling on the left side and prevent further damage to the HVAC system.

5. Can I repair the OBDII code B1340 related to the Left Air Temperature Actuator in my Chevrolet on my own?

- Repairing the left air temperature actuator issue may require some technical knowledge and tools. It is advisable to consult a professional mechanic or refer to the vehicle's service manual for proper guidance on troubleshooting and fixing the problem.

6. Are there any DIY tips for fixing the OBDII code B1340 in a Chevrolet caused by the Left Air Temperature Actuator?

- DIY tips may include checking and cleaning the electrical connections, ensuring proper installation of a new left air temperature actuator if needed, and performing a calibration procedure as per the manufacturer's guidelines.

7. How much does it typically cost to repair the OBDII code B1340 related to the Left Air Temperature Actuator in a Chevrolet?

- The cost of repair can vary depending on the exact cause of the issue, the labor rates in your area, and whether you choose to replace the actuator yourself or have a professional mechanic do the job. Costs can range from $100 to $500 or more.

8. Can a faulty Left Air Temperature Actuator cause other OBDII codes to appear in a Chevrolet?

- Yes, a malfunctioning left air temperature actuator can sometimes trigger related trouble codes such as B1341 (Right Air Temperature Actuator) or codes related to HVAC system faults, so it's essential to address the issue promptly to prevent further complications.

9. How long does it usually take to repair the OBDII code B1340 in a Chevrolet caused by the Left Air Temperature Actuator?

- The repair time can vary depending on the exact cause of the issue, the accessibility of the actuator, and the expertise of the person performing the repair. In general, it can take anywhere from 1 to 3 hours to replace the left air temperature actuator.

10. Will resetting the OBDII code B1340 related to the Left Air Temperature Actuator in my Chevrolet solve the problem temporarily?

- Resetting the trouble code may temporarily clear the warning light, but it will not fix the underlying issue causing the code. It is important to diagnose and repair the root cause of the problem to ensure proper functionality of the HVAC system.