AutoCodes – Pontiac – B1340 Pontiac

B1340 Pontiac 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 Pontiac 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 655

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

What does this mean?

What are the Possible Causes of the DTC B1340 Pontiac?

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 Pontiac?

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 Pontiac 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 Pontiac Code

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

- Common symptoms include inconsistent or incorrect air temperature from the left side vents, hot air blowing when cold is selected, or vice versa.

2. What could cause OBDII code B1340 to trigger in a Pontiac's Left Air Temperature Actuator?

- The code B1340 can be triggered by a faulty left air temperature actuator, wiring issues, or a malfunction in the HVAC control module.

3. How can I diagnose the cause of OBDII code B1340 in my Pontiac related to the Left Air Temperature Actuator?

- Diagnose the issue by checking the left air temperature actuator for proper operation, inspecting the wiring for damage, and scanning the HVAC system for any related fault codes.

4. Can I still drive my Pontiac with OBDII code B1340 related to the Left Air Temperature Actuator?

- It is generally safe to drive the vehicle with this code, but it is recommended to get it diagnosed and repaired to ensure proper functioning of the HVAC system.

5. Is it possible to reset OBDII code B1340 in a Pontiac related to the Left Air Temperature Actuator?

- Resetting the code may temporarily clear the error, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

6. How much does it typically cost to repair OBDII code B1340 in a Pontiac's Left Air Temperature Actuator?

- The cost of repair can vary depending on the root cause of the issue, but it may involve replacing the left air temperature actuator, repairing wiring, or reprogramming the HVAC control module.

7. Are there any DIY tips for fixing OBDII code B1340 related to the Left Air Temperature Actuator in a Pontiac?

- DIY tips may include checking and securing the wiring connections, ensuring proper calibration of the temperature actuator, and following manufacturer's repair guides.

8. How long does it usually take to repair OBDII code B1340 in a Pontiac's Left Air Temperature Actuator?

- Repair time can vary based on the exact cause of the issue, but it typically takes a few hours to a day for diagnosis and repair by a professional technician.

9. Can a faulty Left Air Temperature Actuator cause other issues in my Pontiac besides triggering OBDII code B1340?

- Yes, a faulty left air temperature actuator can lead to inconsistent cabin temperature control, reduced comfort, and potential strain on the HVAC system components.

10. Is it necessary to replace the Left Air Temperature Actuator if OBDII code B1340 is detected in a Pontiac?

- Replacing the left air temperature actuator may be necessary if it is found to be faulty during diagnosis, but it is important to first confirm the root cause of the issue before proceeding with repairs.