AutoCodes – Saturn – B1340 Saturn

B1340 Saturn 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 Saturn 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 712

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

What does this mean?

What are the Possible Causes of the DTC B1340 Saturn?

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 Saturn?

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 Saturn 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 B1340 Saturn Code

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

- Common symptoms include inconsistent or incorrect air temperature coming from the left side vents, the climate control system not responding to temperature settings, or the AC/heater not working on the left side.

2. What can cause the OBDII code B1340 to trigger in a Saturn?

- The code B1340 can be triggered by a faulty left air temperature actuator, a wiring issue, a malfunctioning climate control module, or a problem with the HVAC system.

3. How can I diagnose the OBDII code B1340 in my Saturn?

- Diagnosis typically involves using a scan tool to read the code, checking the left air temperature actuator for proper operation, inspecting the wiring for any damage, and testing the climate control module.

4. Is it safe to continue driving my Saturn with the OBDII code B1340 present?

- It is generally safe to drive with this code, but you may experience discomfort due to temperature control issues. It's recommended to address the problem to ensure proper functioning of the HVAC system.

5. Can I repair the OBDII code B1340 related to the Left Air Temperature Actuator in my Saturn myself?

- Depending on your experience and tools, you may be able to repair this issue yourself by replacing the left air temperature actuator, fixing any wiring problems, or resetting the climate control module.

6. How much does it typically cost to repair the OBDII code B1340 in a Saturn at a professional mechanic or dealership?

- Repair costs can vary depending on the exact cause of the issue, but they may range from $200 to $500 at a professional mechanic or dealership, including parts and labor.

7. Are there any preventive maintenance tips to avoid triggering the OBDII code B1340 in my Saturn?

- Performing regular HVAC system checks, ensuring proper air filter maintenance, and addressing any temperature control issues promptly can help prevent triggering this code.

8. Will resetting the OBDII code B1340 in my Saturn make the problem go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue with the left air temperature actuator or related components is not addressed, the code is likely to reappear.

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

- Repair times can vary depending on the exact cause of the issue and the availability of parts, but it typically takes 1-3 hours for a professional to diagnose and repair the problem.

10. Can the OBDII code B1340 in a Saturn be related to other HVAC system malfunctions?

- While the B1340 code specifically refers to the Left Air Temperature Actuator, it is possible for other HVAC system malfunctions to trigger similar codes. It's important to diagnose the issue accurately to address all potential problems.