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Engine-Codes – Generic – B1235

B1235 Code - Problem In The Driver Side Air Mix Control Linkage, Door, Or Motor Circuit

Quick Answer

The B1235 diagnostic trouble code indicates a problem in the driver side air mix control linkage, door, or motor circuit. Common causes include Faulty driver side air mix control motor, Damaged or disconnected air mix control linkage, Wiring or electrical issues in the circuit. 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
B1235 indicates Problem In The Driver Side Air Mix Control Linkage, Door, Or Motor Circuit.
Common causes
Common causes include Faulty driver side air mix control motor, Damaged or disconnected air mix control linkage, Wiring or electrical issues in the circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 25, 2024
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Code B1235 Description

The B1235 diagnostic trouble code indicates a problem in the driver side air mix control linkage, door, or motor circuit. This component is responsible for controlling the temperature of the air that is flowing into the vehicle's cabin. When this circuit malfunctions, it can lead to issues with the heating and cooling systems in the vehicle. This can result in the driver being unable to control the temperature inside the vehicle, leading to discomfort and potentially affecting visibility if the defroster is impacted.

OBDII Code B1235 - Problem In The Driver Side Air Mix Control Linkage, Door, Or Motor Circuit
B1235 Code - Problem In The Driver Side Air Mix Control Linkage, Door, Or Motor Circuit

Common Causes of B1235

  1. Faulty driver side air mix control motor.
  2. Damaged or disconnected air mix control linkage.
  3. Wiring or electrical issues in the circuit.
  4. Defective driver side air mix control door.
  5. Issues with the HVAC control unit.

Symptoms of B1235

  1. Inconsistent temperature control inside the vehicle.
  2. Airflow from vents may be weaker than usual.
  3. Strange noises coming from the HVAC system.
  4. The heating or cooling system may not respond to adjustments.
  5. Lack of airflow or temperature control may result in foggy windows.

How to Fix B1235

  1. Diagnose the specific component causing the issue by using a scan tool to retrieve the trouble code.
  2. Inspect the driver side air mix control motor, linkage, door, and circuit for any visible damage or malfunction.
  3. Replace any faulty components such as the motor, linkage, or door as needed.
  4. Repair any damaged wiring or electrical connections in the circuit.
  5. Clear the trouble code from the vehicle's computer system and test the heating and cooling system to ensure proper functionality.

Cost to Fix B1235

The cost of repairing a problem in the driver side air mix control linkage, door, or motor circuit can vary depending on the specific issue and the make and model of the vehicle. On average, the repair costs for this type of issue can range from $200 to $500, including parts and labor. It's important to note that labor rates at auto repair shops can vary, so it's advisable to obtain a few quotes from different shops to get a more accurate estimate.

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Code B1235 Information for Specific Makes

  • B1235 Acura — Problem In The Driver Side Air Mix Control Linkage, Door, Or Motor Circuit
  • B1235 Honda — Problem In The Driver Side Air Mix Control Linkage, Door, Or Motor Circuit
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 B1235 Code

1. What are the common symptoms of OBDII code B1235?

- Common symptoms include issues with adjusting the temperature on the driver side, inconsistent air flow, or a malfunctioning climate control system.

2. What causes the OBDII code B1235 related to the driver side air mix control linkage, door, or motor circuit?

- The code is typically triggered by a faulty driver side air mix control linkage, a malfunctioning air mix door, or a defective motor circuit.

3. How can I diagnose the problem related to OBDII code B1235?

- Diagnosis involves checking the driver side air mix control components for any physical damage, testing the motor circuit for continuity, and verifying proper operation of the air mix door.

4. Can I repair the driver side air mix control linkage issue myself?

- Repairing the driver side air mix control linkage may require disassembling parts of the dashboard, so it is recommended to seek professional help unless you have experience with automotive interior components.

5. Are there any temporary solutions for the B1235 code until I can get it repaired?

- You can try resetting the climate control system by disconnecting the car battery for a few minutes, but keep in mind this is a temporary solution and the issue may recur.

6. How critical is it to address the OBDII code B1235 promptly?

- Addressing the code promptly is important to ensure proper functioning of the climate control system, maintain comfortable driving conditions, and prevent further damage to related components.

7. Can the driver side air mix control linkage problem cause other issues in the vehicle?

- Yes, a malfunctioning driver side air mix control linkage can affect the overall performance of the climate control system and impact the comfort level inside the vehicle.

8. Is it safe to continue driving with the OBDII code B1235 present?

- While it may be safe to drive with the code present, it is not advisable as it can lead to discomfort while driving and potentially cause further damage to the climate control components.

9. How much does it typically cost to repair the driver side air mix control linkage issue?

- The cost of repairing the driver side air mix control linkage can vary depending on the extent of the damage and the labor rates of the auto repair shop, but it may range from $200 to $500.

10. Can extreme temperatures or weather conditions contribute to the occurrence of OBDII code B1235?

- Extreme temperatures or weather conditions can potentially exacerbate existing issues with the driver side air mix control linkage, door, or motor circuit, leading to the triggering of the B1235 code.

Discuss the causes and fixes for B1235 OBDII Code

Submit a New Comment

  • What does a window feedback failure mean? All my windows and mirrors are working?

    Reply to Comment

  • Could be just a bad contact. Try clearing the codes. What make, model and year is your vehicle?

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  • i have a 2003 cts with an abs code b1235 right front abs sensor i replaced wheel hub and sensor and still have tha code and it will not reset what else should i look for

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  • Are there any other symptoms or codes? we couldn't find any information for the code B1235  in the 2003 Cadillac CTS manual

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  • I have a 2003 Ford Explorer with this trouble code what would window feedback failure also have window feed back signal loss code

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