AutoCodes – Cadillac – B1340 Cadillac

B1340 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

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

Code Popularity 2,308

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

What does this mean?

What are the Possible Causes of the DTC B1340 Cadillac?

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 Cadillac?

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 Cadillac 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 B1340 Cadillac code?

Need more information on how to fix the B1340 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1340 Cadillac 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 B1340 Cadillac Code

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

The common symptoms include inconsistent or incorrect temperature output from the left side vents, lack of response when adjusting the temperature controls, and potential issues with the HVAC system.

2. What are the possible causes of OBDII code B1340 related to the Left Air Temperature Actuator in a Cadillac?

Common causes include a faulty left air temperature actuator, wiring issues, blown fuses, or a malfunctioning HVAC control module.

3. How can I diagnose the issue related to OBDII code B1340 in my Cadillac's Left Air Temperature Actuator?

You can start by checking the left air temperature actuator for proper function, inspecting the wiring for any damage, ensuring the fuses related to the HVAC system are intact, and using an OBDII scanner to read and clear the code.

4. Can I repair the Left Air Temperature Actuator issue causing OBDII code B1340 in my Cadillac myself?

While some DIY enthusiasts may be able to replace the left air temperature actuator themselves, it is recommended to consult a qualified mechanic or technician for proper diagnosis and repair to ensure the issue is fixed correctly.

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

While the vehicle may still be operable with this issue, it is advisable to have it inspected and repaired promptly to prevent further damage to the HVAC system and ensure optimal comfort while driving.

6. How much does it typically cost to repair OBDII code B1340 in a Cadillac due to an issue with the Left Air Temperature Actuator?

The cost of repair can vary depending on the exact cause of the issue, labor rates in your area, and whether genuine Cadillac parts are used. It's best to get a few quotes from different repair shops to compare prices.

7. Are there any preventive maintenance tips to avoid OBDII code B1340 related to the Left Air Temperature Actuator in my Cadillac?

Regularly servicing your HVAC system, checking for any unusual temperature fluctuations, and addressing any issues promptly can help prevent the occurrence of OBDII code B1340 and other related problems.

8. Can a malfunctioning Left Air Temperature Actuator causing OBDII code B1340 impact the overall performance of my Cadillac?

While the issue primarily affects the HVAC system's temperature control, a malfunctioning Left Air Temperature Actuator can indirectly impact cabin comfort and potentially lead to discomfort while driving.

9. Will resetting the OBDII code B1340 related to the Left Air Temperature Actuator in my Cadillac fix the issue permanently?

Simply clearing the code without addressing the underlying problem, such as a faulty Left Air Temperature Actuator, is unlikely to fix the issue permanently. It's important to diagnose and repair the root cause to prevent the code from reappearing.

10. How long does it usually take to repair OBDII code B1340 in a Cadillac caused by an issue with the Left Air Temperature Actuator?

The repair time can vary depending on the exact cause of the issue, the availability of parts, and the technician's expertise. In general, a straightforward repair for this code can take a few hours to complete.